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0511-23
0511-33/1
countysligo
countyleitrim0511-24
0511-25
0511-26
0511-27 0511-28
0511-29
0511-300511-31
0511-32
0511-330511-23/1
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Lakes 50m buffer
Lakes
Semi-Natural VegetationSwale / Filter Bed /secondary sp
VS
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Collector Ditch Culvert
Interceptor Ditch Culvert
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
settlement pond - vegetation filter- level spreader
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)
crane platform
borrow pit
turbine and swept area
turbine foundation
Existing ground surfaceminor contour (2 m interval)
existing road to be upgraded
proposed road
Planning Application Boundary(Leitrim County Council)
substation
construction compound
drainage flow/runoffdirection
peat repository
fill area
cut area
stream flow direction
Planning Application Boundary(Sligo County Council)
T2
T1
T3
tw
spvs
peatrepository
Proposed culvert
Interceptor drain
Collector drain
Check dam @ 50 mcentersrefer to detail C
Check dam @ 20 mcenters
refer to detail C
Type Y check damrefer to Detail D
Settlement pondrefer to detail A
proposedaccess track
Flow direction
constructioncompound
Proposedculvert
streamflowdirection
proposedmet mast
walkway
PlanningApplication
Proposed culvertrefer to detail B
silt fencerefer to detail F
O
O
OO
O
O
O
O
O
O
tw
tw
tw
tw tw
tw
tw
tw
tw
O
O
tw
O
tw
PlanningApplication
sp
sp
vs
spvs
sp sp
sp
sp
spvs
vs
sp
vssp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
carpark
sp
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coillte Teo
Drawing No: P1459-0-0720-A1-0511-23-00A
Figure No: 0511-23
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
0511-23/1
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Lakes 50m buffer
Lakes
Semi-Natural VegetationSwale / Filter Bed /secondary sp
VS
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Collector Ditch Culvert
Interceptor Ditch Culvert
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
settlement pond - vegetation filter- level spreader
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)
crane platform
borrow pit
turbine and swept area
turbine foundation
Existing ground surfaceminor contour (2 m interval)
existing road to be upgraded
proposed road
Planning Application Boundary(Leitrim County Council)
substation
construction compound
drainage flow/runoffdirection
peat repository
fill area
cut area
stream flow direction
Planning Application Boundary(Sligo County Council)
T5
T4 T6
tw
tw
spvs
sp
spProposedculvertdetail B
PlanningApplication
Interceptor drain
Collector drain
Check dam @ 50 mcentersrefer to detail C
Check dam @ 20 mcenters
refer to detail c
Settlement pondrefer to detail A
proposedaccess track
Flow direction
Type Y check damrefer to Detail d
substation
constructioncompound
Flow direction
constructioncompound
LOUGHNACROAGH
streamflowdirection
walkway
forestryroad
boardwalk
forestryroad
silt fencedetail F
O
O
O
O
O
O
O
O
Otw
tw
tw
tw
tw
tw
tw
tw
O
O
spvs
spvs
spvs
spvs
spvs
vs
vs sp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
0511-23
0511-33/1
countysligo
countyleitrim0511-24
0511-25
0511-26
0511-27 0511-28
0511-29
0511-300511-31
0511-32
0511-330511-23/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coillte Teo
Figure No:
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing No: P1459-0-0720-A1-0511-24-00A
0511-24
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Lakes 50m buffer
Lakes
Semi-Natural VegetationSwale / Filter Bed /secondary sp
VS
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Collector Ditch Culvert
Interceptor Ditch Culvert
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
settlement pond - vegetation filter- level spreader
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)
crane platform
borrow pit
turbine and swept area
turbine foundation
Existing ground surfaceminor contour (2 m interval)
existing road to be upgraded
proposed road
Planning Application Boundary(Leitrim County Council)
substation
construction compound
drainage flow/runoffdirection
peat repository
fill area
cut area
stream flow direction
Planning Application Boundary(Sligo County Council)
T7
T10
T8
O
tw
spvs
Proposed culvertdetail b
PlanningApplication
Interceptor drain
Collector drain
Check dam @ 50 mcenters
refer to detail c
Settlement pondrefer to detail A
Flow direction
Check dam @ 20 mcenters
refer to detail c
Type Y check damrefer to Detail D
constructioncompound
Flow direction
streamflowdirection
forestryroad
silt fencedetail F
O
O
O
O
O
O
O
O
tw
tw
tw tw
tw
tw
tw
tw
tw
O
O
tw
PlanningApplication
spvs
spvs
spvs
spvs
spvs
sp
sp
sp
sp
vssp
spvs
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
0511-23
0511-33/1
countysligo
countyleitrim0511-24
0511-25
0511-26
0511-27 0511-28
0511-29
0511-300511-31
0511-32
0511-330511-23/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coillte Teo
Drawing No: P1459-0-0720-A1-0511-25-00A
Figure No: 0511-25
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Lakes 50m buffer
Lakes
Semi-Natural VegetationSwale / Filter Bed /secondary sp
VS
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Collector Ditch Culvert
Interceptor Ditch Culvert
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
settlement pond - vegetation filter- level spreader
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)
crane platform
borrow pit
turbine and swept area
turbine foundation
Existing ground surfaceminor contour (2 m interval)
existing road to be upgraded
proposed road
Planning Application Boundary(Leitrim County Council)
substation
construction compound
drainage flow/runoffdirection
peat repository
fill area
cut area
stream flow direction
Planning Application Boundary(Sligo County Council)
T9
borrow pit
peat
Proposed culvertdetail b
Proposed culvert
Interceptor drain
Collector drain
Check dam @ 50 mcentersrefer to detail c
Settlement pondrefer to detail A
proposedaccess track
Check dam @ 20 mcenters
refer to detail c
Type Y check damrefer to Detail d
Flow direction
PlanningApplication
streamflowdirection
silt fencedetail F
O
O
O
O
O
OO
O
O
O
tw
tw
tw
tw
tw
tw
tw
tw
O
O
tw
sf
tw
tw
spvs
spvs
spvs
spvs
spvs
sp
sp
sp
vssp
vssp
spvs
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
0511-23
0511-33/1
countysligo
countyleitrim0511-24
0511-25
0511-26
0511-27 0511-28
0511-29
0511-300511-31
0511-32
0511-330511-23/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coillte Teo
Figure No:
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing No: P1459-0-0720-A1-0511-26-00A
0511-26
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Lakes 50m buffer
Lakes
Semi-Natural VegetationSwale / Filter Bed /secondary sp
VS
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Collector Ditch Culvert
Interceptor Ditch Culvert
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
settlement pond - vegetation filter- level spreader
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)
crane platform
borrow pit
turbine and swept area
turbine foundation
Existing ground surfaceminor contour (2 m interval)
existing road to be upgraded
proposed road
Planning Application Boundary(Leitrim County Council)
substation
construction compound
drainage flow/runoffdirection
peat repository
fill area
cut area
stream flow direction
Planning Application Boundary(Sligo County Council)
peatrepository
Proposed culvertdetail b
Proposed culvert
Interceptor drain
Collector drain
Check dam @ 50 mcentersrefer to detail c
Type Y check damrefer to Detail d
Settlement pondrefer to detail A
Flow direction
Check dam @ 20 mcenters
refer to detail E
Flow direction
PlanningApplication
streamflowdirection
O
O
O
O
O
tw
tw
tw
tw
tw
O
O
tw
tw
spvs
spvs
spvs
sp
sp
vs
vs
sp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
0511-23
0511-33/1
countysligo
countyleitrim0511-24
0511-25
0511-26
0511-27 0511-28
0511-29
0511-300511-31
0511-32
0511-330511-23/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coilte teo
Drawing No: P1459-0-0720-A1-0511-27-00A
Figure No: 0511-27
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)
existing road to beupgradedproposed road
large drainage arrows
fill area
cut area
stream flow direction
road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)
Planning Application Boundary(Leitrim County Council)Planning Application Boundary(Sligo County Council)
PlanningApplication
Flow direction
Flow direction
Collector drain
Collector drain
Settlement pondrefer to detail A
Interceptor drain
Check dam @ 50 mcenters
refer to detail c
Check dam @ 20 mcenters
refer to detail c
Check dam @ 20 mcentersrefer to detail c
Type Y check damrefer to Detail d
existing drainage alongl4282 to be maintained
existing drainage alongl4282 to be maintained
existing drainage alongl4282 to be maintained
ROAD L4282
ROAD L4282
ROAD L4282
tw
tw
tw
tw
sp
sp
sp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
0511-23
0511-33/1
countysligo
countyleitrim0511-24
0511-25
0511-26
0511-27 0511-28
0511-29
0511-300511-31
0511-32
0511-330511-23/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coilte teo
Figure No:
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing No: P1459-0-0720-A1-0511-28-00A
0511-28
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)
existing road to beupgradedproposed road
large drainage arrows
fill area
cut area
stream flow direction
road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)
Planning Application Boundary(Leitrim County Council)Planning Application Boundary(Sligo County Council)
PlanningApplication
streamflow
direction
streamflowdirection
streamflowdirection
Flow direction
Check dam @ 50 mcenters
refer to detail c
existing drainage alongl4282 to be maintained
existing drainage alongl4282 to be maintained
existing drainagealong L4282to be maintained
ROAD L4282
ROAD L4282
ROAD L4282
Existing culvert
Existingculvert
Existing culvert
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
0511-23
0511-33/1
countysligo
countyleitrim0511-24
0511-25
0511-26
0511-27 0511-28
0511-29
0511-300511-31
0511-32
0511-330511-23/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coilte teo
Drawing No: P1459-0-0720-A1-0511-29-00A
Figure No: 0511-29
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)
existing road to beupgradedproposed road
large drainage arrows
fill area
cut area
stream flow direction
road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)
Planning Application Boundary(Leitrim County Council)Planning Application Boundary(Sligo County Council)
PlanningApplication
streamflowdirection
streamflowdirection
Flow direction
Flow direction
Collector drain
Settlement pondrefer to detail A
Interceptordrain
Check dam @ 50 mcenters
refer to detail c
Check dam @ 20 mcenters
refer to detail c
Type Y check damrefer to Detail d
existing drainage along
existing drainagealong L4282to be maintained
ROAD L4282
ROAD L4282
Existingculvert
Existing culvert
Proposed culverttw
tw tw tw
tw
O
sp
spsp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
0511-23
0511-33/1
countysligo
countyleitrim0511-24
0511-25
0511-26
0511-27 0511-28
0511-29
0511-300511-31
0511-32
0511-330511-23/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coilte teo
Drawing No: P1459-0-0720-A1-0511-30-00A
Figure No: 0511-30
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)
existing road to beupgradedproposed road
large drainage arrows
fill area
cut area
stream flow direction
road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)
Planning Application Boundary(Leitrim County Council)Planning Application Boundary(Sligo County Council)
PlanningApplication
streamflowdirection
Flow direction
Flow direction
Collector drain
Settlement pondrefer to detail A
Check dam @ 20 mcentersrefer to detail c
Type Y check damrefer to Detail d
Proposed culvertdetail b
twtw
twtw
sp sp
sp
sp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
0511-23
0511-33/1
countysligo
countyleitrim0511-24
0511-25
0511-26
0511-27 0511-28
0511-29
0511-300511-31
0511-32
0511-330511-23/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 03/06/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coilte teo
Figure No:
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing No: P1459-0-0620-A1-0511-31-00A
0511-31
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)
existing road to beupgradedproposed road
large drainage arrows
fill area
cut area
stream flow direction
road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)
Planning Application Boundary(Leitrim County Council)Planning Application Boundary(Sligo County Council)
PlanningApplication
streamflowdirection
Flow direction
Flow direction
Collector drain
Collector drain
Settlement pondrefer to detail A
silt fencedetail F
Check dam @ 20 mcenters
refer to detail c
Type Y check damrefer to Detail d
Proposedculvertdetail b
twtw
tw
twtw
tw
twtw
tw
tw
tw
tw
Proposedculvertdetail b
Type Y check damrefer to Detail d
spsp
sp
spsp
sp
sp
spsp
sp
sp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
0511-23
0511-33/1
countysligo
countyleitrim0511-24
0511-25
0511-26
0511-27 0511-28
0511-29
0511-300511-31
0511-32
0511-330511-23/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coilte teo
Drawing No: P1459-0-0720-A1-0511-32-00A
Figure No: 0511-32
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
0511-23
0511-33/1
countysligo
countyleitrim0511-24
0511-25
0511-26
0511-27 0511-28
0511-29
0511-300511-31
0511-32
0511-330511-23/1
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Lakes 50m buffer
Lakes
Semi-Natural VegetationSwale / Filter Bed /secondary sp
VS
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Collector Ditch Culvert
Interceptor Ditch Culvert
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
settlement pond - vegetation filter- level spreader
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)
crane platform
borrow pit
turbine and swept area
turbine foundation
Existing ground surfaceminor contour (2 m interval)
existing road to be upgraded
proposed road
Planning Application Boundary(Leitrim County Council)
substation
construction compound
drainage flow/runoffdirection
peat repository
fill area
cut area
stream flow direction
Planning Application Boundary(Sligo County Council)
Collector drain
sp
tw
tw
tw
tw
sp
sp
sp
Flowdirection
PlanningApplication
Type Y check damrefer to Detail d
streamflowdirection
Settlement pondrefer to detail A
Check dam @ 20 mcenters
refer to detail c
Flowdirection
Collector drain
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
twsptw
sp
sp
sptwtw
silt fencedetail F
Proposedculvertdetail b
streamflowdirection
Collector drain
Check dam @ 20 mcentersrefer to detail c
Flowdirection
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coillte Teo
Drawing No: P1459-0-0720-A1-0511-33-00A
Figure No: 0511-33
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
0511-33/1
10001000
4000
10000
swale to be widened at entry to pond
INLET- divert roadside ditchinto settlement pond
100mm single sized stoneplaced at entrance to settlement pondand and within forebay area
initial stilling check damconstructed from20-40mm clean stone core with200mm cover of 100mm single size stone
geotextilewrap
1000 11250 3000
75
0
800
1000
100
discharge collector ditch
outflow control levelto be set 500mmbelow top of gabion
permenant water level
gabion basketmain settlement pond sediment forebay
100mm single sized stoneplaced at entrance to settlementpond and and within forebay area
forebay to be cleanedout regularly
Embankments to be constructedfrom suitable excavated
materials. Post constructionphase embankment materials to
be used to infill pond.phasing of infill to be agreed
with SUDS designer
YY'ZZ'
200
750
storage depth
discharge level
geotextile wrap embeddedinto embankment to preventpreferential flow alongedge of gabion basket
Silt will collect in the base of thesettlement pond. This will have tobe cleaned out regularly. Silt buildup should be monitored on site.
extend boundary bermsto prevent overflow
geotextilewrap
overflow dischargeto collector ditch
6250
1400 4000
invert ofinlet v-ditch
bed slope 1:50max.
20-40mm filtrationstone placed priorto gabions
SECTION
SCALE 1:100
SECTION
SCALE 1:100
ZZ'
YY'
ACCESS TRACK
ACCESS TRACK
TE A - TICAL ROAD SIDE SETTLEET OD DETAILSCALE 1:200 (NOTE DIMENSIONS VARY DEPENDING ON CATCHMENT SIZE - see attached table)
Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
Road
Timberstake
hy-tex terrastoppremium silt fence
Sediment fence/check dam detail
Bank
Bank
2000
4000 4000 4000
1500
4x2" knife edge weir 4x2" knife edge weir
20mm plywood sheet 20mm plywood sheet 20mm plywood sheetLaminar
flow in 2000
Forestry drains(applicable only
in forestry areas)
Block 5 forestry drains down slope of a outlet toprevent pollution to
reveiving waters
Blocked
BlockedSmall, medium & largestone filter beds
200
500
1000
20mm plywood sheet
Bank
4000 4000 4000
1500
200
Top of bank
4x2" knife edge weir 4x2" knife edge weir
Small, medium & largestone filter beds
Geotextile betweenbed to stop mixing of stone sizes
200
500
1000
20mm plywood sheet
200
500
1000
20mm plywood sheet
1000 gauge impereable polythene 1000 gauge impereable polythene
Laminar flow in drain
Outflow
Groundlevel
Sheet flow out overexisting vegetation or
into forest drain
Bank Bank
Top of bankTop of water
level
Top of bank
1000
500
2000
Section 11'
Section 22'
1'1
2'
2
TE B - TICAL ROAD SIDE SETTLEET OD DETAILSCALE 1:200 (NOTE DIMENSIONS VARY DEPENDING ON CATCHMENT SIZE - see attached table)
Pond Size m x L m x D m Catchment Size (m)
Return Period 50 yrs Storm Duration 500 1000 2000
6hr retention for coarse silt 6 hrs 2.8 x 9 x 1 m 4 x 13 x 1 m 5.7 x 18 x 1 m
11hr retention for medium silt 12 hrs 3.2 x 10 x 1 m 4.5 x 14 x 1 m 6.4 x 20 x 1 m
24hr retention for fine silt 24 hrs 3.5 x 11 x 1 m 5 x 16 x 1 m 7 x 22 x 1 m
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: as shown (A1)
Checked By: M.G.
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Drainage Details 1
Croagh WF
Drawing No: P1459-0-0720-A1-0511-34-00A
Figure No: 0511-34
DETAIL A1
DETAIL A2
MGMGPlanning
Coilte teo
Date: 07/07/2020
07/07/20
Example settlement pond sizes
type x - check dam detailcale
road side ditch twl
stone check dam20-40mm drainage stone
provide geotextilewrap if necessary
access roadway
road side ditch
-
-
mm
LONGITUDINAL ELEVATION
PLAN
stone check dam20-40mm drainagestone
provide geotextilewrap if necessary
side long view of access roadway surface
type y - check dam detailscale 1:100
side long view of access roadway surface
road side ditch/ditch twl
stone check dam20-40mm drainage stone provide geotextile
wrap if necessary
access roadway
road side ditch / ditch
direction of flow
provide geotextilewrap if necessary
ground level
34"marine plywood baffleplate 300mm embedded
into base of drain / ditch
twl
fencing post driveninto peat/subsoil forlateral support
VARIE
S -
20
0
stone check dam20-40mm drainage stoneplywood embedded 200mm
into sidewall of ditch
LONGITUDINAL ELEVATION
PLAN
Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.
Drainage Design Notes
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
accessroad
top of bank
plancollector ditch
toe of bank
silt fence
outfall protection berm
existingculvet
top of bank
access road
outfall protection berm
toe of bank
izometric view
collector ditch
existing culvet
silt fence
schematic - not to scaleCULVET - OUTFALL PROTECTION DETAIL
existingforestrydrains
existing forestry drains
mm m
in
mm m
in
Spill
way
MM m
in
note: spacing of check dams along centreline and scour protectionbelow each check dam
spillway
needle punchedgeofabric on downstreamspillway protection toprevent erosion
bag fill material eitheraggregate, sand or drysand - cement mixture
schematic - not to scale
TEMPORARY CHECK DAM / SETTLEMENT POND OVERFLOWSAND FILLED BAG CONSTRUCTION
A B
lenth ch that point a and have eal elevation
check damerosion protection
elevation
schematic - not to scaleTEMPORARY CHECK DAM / SETTLEMENT POND OVERFLOW
'x' +600 Max.
m
in
'x'
single layer geosyntheticOR FELLED FOREST LOGSSUITABLE AGGRAGATE FILL
DRAINAGE PIPE IF REQUIRED
ROAD LEVEL
SCALE 1:100
max
750
min
.
ROAD CONSTRUCTIONCAPPING MATERIAL/
DIAMETER VARIESDRAINAGE PIPE,
503.3 (1) OF THE NRAFILL MATERIAL TO CL.
SPEC. FOR ROADWORKS
ROAD LEVEL
SCALE 1:50
'x' +300 Min.
TRENCH WIDTH=
'TYPE B' CULVERT - DRAINAGE CROSSING BENEATH EXCAVATED ROAD
'TYPE A' CULVERT - DRAINAGE CROSSING BENEATH FLOATING ROAD
reinforcement / separation
refer to client standard detail for road make up
refer to client standard detail
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: as shown (A1)
Checked By: M.G.
Client:
Job:
Title:
Figure No: -
DETAIL C DETAIL D
DETAIL B
DETAIL C
DETAIL C
DETAIL B
Drawn By: MG/GD
Project No.: P1459-0
Croah WF
Drainae Detail
Drawing No: P1459-0-0720-A1-0511-35-00A
MGMGPlanning
Coilte teo
Date: 07/07/2020
07/07/20
distributor drain
collector drain
overland discharge oroutfall to watercoursevia settlement pond
vegetation swale
lined with slightlyraised peat turves
typical vegetation swale - planscale 1:250
check dam locations
A
A
'
B
B
'
G.L.
Mineral Soil
raised/contouredpeat blocks
top of peat blocks to beapprox 200 mm higher thanadjacent undisturbed ground
peatcatotelm peat mass
upper vegetationlayer and root zone regulation layer of
placed peatapprox 200 mm
G.L.
Mineral Soil
contoured raisedturves along edgeof vegetation swale
peatcatotelm peat mass
upper vegetationlayer and root zone
collector ditch
distributor ditch
~7.5 to 15m
AA'SCALE 1:200ECTIN
BB'SCALE 1:100ECTIN
silt fencescale 1:25
MIN. 1000
material stockpile
in-situ peat
Stakes driven500-700mm intoground
Staple holds Geotextilefilter fabric in place
silt fence embedded100mm into ground
Refer to Habitat management Planand Peat Management PLan
for Stockpile management notes
Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
road constructionas per client
standard details
Staple holds Geotextilefilter fabric in place
Stakes driven500-700mm into ground
Geotextileembedded 200mm
silt fence for watercourse protectionscale 1:25
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: as shown (A1)
Checked By: M.G.
Client:
Job:
Title:
Drainage Details 3
Figure No: 0511-36
DETAIL E
DETAIL F-1
DETAIL F-I1
Drawn By: MG/GD
Croagh WF
Project No.: P1459-0
Drawing No: P1459-0-0720-A1-0511-36-00A
MGMGPlanning
Coilte teo
Date: 07/07/2020
03/06/20
Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
Collector drain
W'W
Accessroad
Collector ditch
Edge protectionTop of bank
Toe of bank
Silt fence
Accessroad
Collector drain
Ground levelSkallow
collectorditch
Edgeprotection
Siltfence
Groundlevel
Placed roadedge material
2
1
Spillway outfall
Silt fence
Edge protection
Collector ditch
Access road
Collector drain
SpillwayY'Y
X'
X
Settlement pond
Settlement pond
Settlement pond
PLA
SECTI WW'
IETIC IEW
spillwa outfall planschematic - not to scale
750
6750
150
300
SIDE ELEATI
PLADrainage pipecut in half andlinked togetherwith chain link and rivets
Pipe can be placed on
uneven groundand creates
flow channel andprevents erosion
X
X'
XX'
TYPICAL PIPE SPILLWAY DETAIL
YY'
scale 1:50
Steep batter to beprotected
6D
Diversion bankDown drain
Inlet stabilisedwith sandbags
Pipe slope 3% of steeper Flexible pipe
3D+0.6m1,3m at less
than 1% grade
d
schematic - not to scaleTYPICAL PIPE SPILLWAY DETAIL
3000
3000
TEPA CNCETE ASH T PIT
Plan
ELEATIN
stop log
concrete lorry
stop log500
2000 gaugepolythene
SCALE 1:50
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: as shown (A1)
Checked By: M.G.
Client:
Job:
Title:
Drainage Details 4
Figure No: 0511-37
DETAIL H
DETAIL G
DETAIL I
Drawn By: MG/GD
Croagh WF
Coilte teo
Project No.: P1459-0
Date: 07/07/2020
Drawing No: P1459-0-0720-A1-0511-37-00A
MGMGPlanning07/07/20
countysligo
countyleitrim0511-23A
0511-33A/1
0511-24A
0511-25A
0511-26A
0511-27A0511-28A
0511-29A
0511-30A
0511-31A
0511-32A
0511-33A0511-23A/1
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Lakes 50m buffer
Lakes
Semi-Natural VegetationSwale / Filter Bed /secondary sp
VS
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Collector Ditch Culvert
Interceptor Ditch Culvert
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
settlement pond - vegetation filter- level spreader
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)
crane platform
borrow pit
turbine and swept area
turbine foundation
Existing ground surfaceminor contour (2 m interval)
existing road to be upgraded
proposed road
substation
construction compound
drainage flow/runoffdirection
peat repository
fill area
cut area
stream flow direction
Planning Application Boundary(Leitrim County Council)
Planning Application Boundary(Sligo County Council)
T2
T1
T3
tw
spvs
peatrepository
Proposed culvert
Interceptor drain
Collector drain
Check dam @ 50 mcentersrefer to detail C
Check dam @ 20 mcenters
refer to detail C
Type Y check damrefer to Detail D
Settlement pondrefer to detail A
proposedaccess track
Flow direction
constructioncompound
Proposedculvert
streamflowdirection
proposedmet mast
walkway
PlanningApplication
Proposed culvertrefer to detail B
silt fencerefer to detail F
O
O
OO
O
O
O
O
O
O
tw
tw
tw
tw tw
tw
tw
tw
tw
O
O
tw
O
tw
PlanningApplication
sp
sp
vs
spvs
sp sp
sp
sp
spvs
vs
sp
vssp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
carpark
sp
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coillte Teo
Figure No:
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
0511-23A/1
Drawing No: P1459-0-0620-A1-0511-23A-00A
0511-23A
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Lakes 50m buffer
Lakes
Semi-Natural VegetationSwale / Filter Bed /secondary sp
VS
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Collector Ditch Culvert
Interceptor Ditch Culvert
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
settlement pond - vegetation filter- level spreader
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)
crane platform
borrow pit
turbine and swept area
turbine foundation
Existing ground surfaceminor contour (2 m interval)
existing road to be upgraded
proposed road
substation
construction compound
drainage flow/runoffdirection
peat repository
fill area
cut area
stream flow direction
Planning Application Boundary(Leitrim County Council)
Planning Application Boundary(Sligo County Council)
T5
T4 T6
tw
tw
spvs
sp
spProposedculvertdetail B
PlanningApplication
Interceptor drain
Collector drain
Check dam @ 50 mcentersrefer to detail C
Check dam @ 20 mcenters
refer to detail c
Settlement pondrefer to detail A
proposedaccess track
Flow direction
Type Y check damrefer to Detail d
substation
constructioncompound
Flow direction
constructioncompound
LOUGHNACROAGH
streamflowdirection
walkway
forestryroad
boardwalk
forestryroad
silt fencedetail F
O
O
O
O
O
O
O
O
Otw
tw
tw
tw
tw
tw
tw
tw
O
O
spvs
spvs
spvs
spvs
spvs
vs
vs sp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
countysligo
countyleitrim0511-23A
0511-33A/1
0511-24A
0511-25A
0511-26A
0511-27A0511-28A
0511-29A
0511-30A
0511-31A
0511-32A
0511-33A0511-23A/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coillte Teo
Drawing No: P1459-0-0620-A1-0511-24A-00A
Figure No: 0511-24A
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Lakes 50m buffer
Lakes
Semi-Natural VegetationSwale / Filter Bed /secondary sp
VS
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Collector Ditch Culvert
Interceptor Ditch Culvert
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
settlement pond - vegetation filter- level spreader
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)
crane platform
borrow pit
turbine and swept area
turbine foundation
Existing ground surfaceminor contour (2 m interval)
existing road to be upgraded
proposed road
substation
construction compound
drainage flow/runoffdirection
peat repository
fill area
cut area
stream flow direction
Planning Application Boundary(Leitrim County Council)
Planning Application Boundary(Sligo County Council)T7
T10
T8
O
tw
spvs
Proposed culvertdetail b
PlanningApplication
Interceptor drain
Collector drain
Check dam @ 50 mcenters
refer to detail c
Settlement pondrefer to detail A
Flow direction
Check dam @ 20 mcenters
refer to detail c
Type Y check damrefer to Detail D
constructioncompound
Flow direction
streamflowdirection
forestryroad
silt fencedetail F
O
O
O
O
O
O
O
O
tw
tw
tw tw
tw
tw
tw
tw
tw
O
O
tw
PlanningApplication
spvs
spvs
spvs
spvs
spvs
sp
sp
sp
sp
vssp
spvs
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
countysligo
countyleitrim0511-23A
0511-33A/1
0511-24A
0511-25A
0511-26A
0511-27A0511-28A
0511-29A
0511-30A
0511-31A
0511-32A
0511-33A0511-23A/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coillte Teo
Figure No:
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing No: P1459-0-0720-A1-0511-25A-00A
0511-25A
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Lakes 50m buffer
Lakes
Semi-Natural VegetationSwale / Filter Bed /secondary sp
VS
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Collector Ditch Culvert
Interceptor Ditch Culvert
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
settlement pond - vegetation filter- level spreader
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)
crane platform
borrow pit
turbine and swept area
turbine foundation
Existing ground surfaceminor contour (2 m interval)
existing road to be upgraded
proposed road
substation
construction compound
drainage flow/runoffdirection
peat repository
fill area
cut area
stream flow direction
Planning Application Boundary(Leitrim County Council)
Planning Application Boundary(Sligo County Council)
T9
borrow pit
peat
Proposed culvertdetail b
Proposed culvert
Interceptor drain
Collector drain
Check dam @ 50 mcentersrefer to detail c
Settlement pondrefer to detail A
proposedaccess track
Check dam @ 20 mcenters
refer to detail c
Type Y check damrefer to Detail d
Flow direction
PlanningApplication
streamflowdirection
silt fencedetail F
O
O
O
O
O
OO
O
O
O
tw
tw
tw
tw
tw
tw
tw
tw
O
O
tw
sf
tw
tw
spvs
spvs
spvs
spvs
spvs
sp
sp
sp
vssp
vssp
spvs
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
countysligo
countyleitrim0511-23A
0511-33A/1
0511-24A
0511-25A
0511-26A
0511-27A0511-28A
0511-29A
0511-30A
0511-31A
0511-32A
0511-33A0511-23A/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coillte Teo
Drawing No: P1459-0-0720-A1-0511-26A-00A
Figure No: 0511-26A
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Lakes 50m buffer
Lakes
Semi-Natural VegetationSwale / Filter Bed /secondary sp
VS
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Collector Ditch Culvert
Interceptor Ditch Culvert
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
settlement pond - vegetation filter- level spreader
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)
crane platform
borrow pit
turbine and swept area
turbine foundation
Existing ground surfaceminor contour (2 m interval)
existing road to be upgraded
proposed road
substation
construction compound
drainage flow/runoffdirection
peat repository
fill area
cut area
stream flow direction
Planning Application Boundary(Leitrim County Council)
Planning Application Boundary(Sligo County Council)
peatrepository
Proposed culvertdetail b
Proposed culvert
Interceptor drain
Collector drain
Check dam @ 50 mcentersrefer to detail c
Type Y check damrefer to Detail d
Settlement pondrefer to detail A
Flow direction
Check dam @ 20 mcenters
refer to detail E
Flow direction
PlanningApplication
streamflowdirection
O
O
O
O
O
tw
tw
tw
tw
tw
O
O
tw
tw
spvs
spvs
spvs
sp
sp
vs
vs
sp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
countysligo
countyleitrim0511-23A
0511-33A/1
0511-24A
0511-25A
0511-26A
0511-27A0511-28A
0511-29A
0511-30A
0511-31A
0511-32A
0511-33A0511-23A/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coilte teo
Figure No:
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing No: P1459-0-0720-A1-0511-27A-00A
0511-27A
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)
existing road to beupgradedproposed road
large drainage arrows
fill area
cut area
stream flow direction
road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)
Planning Application Boundary(Leitrim County Council)
Planning Application Boundary(Sligo County Council)
PlanningApplication
Flow direction
Flow direction
Collector drain
Collector drain
Settlement pondrefer to detail A
Interceptor drain
Check dam @ 50 mcenters
refer to detail c
Check dam @ 20 mcenters
refer to detail c
Check dam @ 20 mcentersrefer to detail c
Type Y check damrefer to Detail d
existing drainage alongl4282 to be maintained
existing drainage alongl4282 to be maintained
existing drainage alongl4282 to be maintained
ROAD L4282
ROAD L4282
ROAD L4282
tw
tw
tw
tw
sp
sp
sp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
countysligo
countyleitrim0511-23A
0511-33A/1
0511-24A
0511-25A
0511-26A
0511-27A0511-28A
0511-29A
0511-30A
0511-31A
0511-32A
0511-33A0511-23A/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coilte teo
Drawing No: P1459-0-0720-A1-0511-28A-00A
Figure No: 0511-28A
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)
existing road to beupgradedproposed road
large drainage arrows
fill area
cut area
stream flow direction
road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)
Planning Application Boundary(Leitrim County Council)
Planning Application Boundary(Sligo County Council)
PlanningApplication
streamflow
direction
streamflowdirection
streamflowdirection
Flow direction
Check dam @ 50 mcenters
refer to detail c
existing drainage alongl4282 to be maintained
existing drainage alongl4282 to be maintained
existing drainagealong L4282to be maintained
ROAD L4282
ROAD L4282
ROAD L4282
Existing culvert
Existingculvert
Existing culvert
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
countysligo
countyleitrim0511-23A
0511-33A/1
0511-24A
0511-25A
0511-26A
0511-27A0511-28A
0511-29A
0511-30A
0511-31A
0511-32A
0511-33A0511-23A/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coilte teo
Figure No:
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing No: P1459-0-0720-A1-0511-29A-00A
0511-29A
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)
existing road to beupgradedproposed road
large drainage arrows
fill area
cut area
stream flow direction
road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)
Planning Application Boundary(Leitrim County Council)
Planning Application Boundary(Sligo County Council)
PlanningApplication
streamflowdirection
streamflowdirection
Flow direction
Flow direction
Collector drain
Settlement pondrefer to detail A
Interceptordrain
Check dam @ 50 mcenters
refer to detail c
Check dam @ 20 mcenters
refer to detail c
Type Y check damrefer to Detail d
existing drainage along
existing drainagealong L4282to be maintained
ROAD L4282
ROAD L4282
Existingculvert
Existing culvert
Proposed culverttw
tw tw tw
tw
O
sp
spsp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
countysligo
countyleitrim0511-23A
0511-33A/1
0511-24A
0511-25A
0511-26A
0511-27A0511-28A
0511-29A
0511-30A
0511-31A
0511-32A
0511-33A0511-23A/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coilte teo
Figure No:
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing No: P1459-0-0720-A1-0511-30A-00A
0511-30A
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)
existing road to beupgradedproposed road
large drainage arrows
fill area
cut area
stream flow direction
road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)
Planning Application Boundary(Leitrim County Council)
Planning Application Boundary(Sligo County Council)
PlanningApplication
streamflowdirection
Flow direction
Flow direction
Collector drain
Settlement pondrefer to detail A
Check dam @ 20 mcentersrefer to detail c
Type Y check damrefer to Detail d
Proposed culvertdetail b
twtw
twtw
sp sp
sp
sp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
countysligo
countyleitrim0511-23A
0511-33A/1
0511-24A
0511-25A
0511-26A
0511-27A0511-28A
0511-29A
0511-30A
0511-31A
0511-32A
0511-33A0511-23A/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 03/06/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coilte teo
Drawing No: P1459-0-0620-A1-0511-31A-00A
Figure No: 0511-31A
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)
existing road to beupgradedproposed road
large drainage arrows
fill area
cut area
stream flow direction
road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)
Planning Application Boundary(Leitrim County Council)
Planning Application Boundary(Sligo County Council)
PlanningApplication
streamflowdirection
Flow direction
Flow direction
Collector drain
Collector drain
Settlement pondrefer to detail A
silt fencedetail F
Check dam @ 20 mcenters
refer to detail c
Type Y check damrefer to Detail d
Proposedculvertdetail b
twtw
tw
twtw
tw
twtw
tw
tw
tw
tw
Proposedculvertdetail b
Type Y check damrefer to Detail d
spsp
sp
spsp
sp
sp
spsp
sp
sp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
countysligo
countyleitrim0511-23A
0511-33A/1
0511-24A
0511-25A
0511-26A
0511-27A0511-28A
0511-29A
0511-30A
0511-31A
0511-32A
0511-33A0511-23A/1
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coilte teo
Figure No:
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
Drawing No: P1459-0-0720-A1-0511-32-00A
0511-32A
countysligo
countyleitrim0511-23A
0511-33A/1
0511-24A
0511-25A
0511-26A
0511-27A0511-28A
0511-29A
0511-30A
0511-31A
0511-32A
0511-33A0511-23A/1
Drawing Legend :rivers/streams
rivers/streams 50m buffer
Lakes 50m buffer
Lakes
Semi-Natural VegetationSwale / Filter Bed /secondary sp
VS
Overland Flow Discharge
Settlement Pond
O
Exist
ing
Dra
inage
SP
Pro
pose
d Dra
inage
Collector Ditch Culvert
Interceptor Ditch Culvert
Treated Water DischargeTW
proposed culverts/bridges
Check Dam 'type A'
settlement pond - vegetation filter- level spreader
Silt Fences
Direction of flow
Swales/Downstream Collector Drain
Upstream Interceptor Drain
Check Dam 'type B'
Pumping Sump
settlement pond - level spreader
Existing ground surfacemajour contour (10 m interval)
crane platform
borrow pit
turbine and swept area
turbine foundation
Existing ground surfaceminor contour (2 m interval)
existing road to be upgraded
proposed road
substation
construction compound
drainage flow/runoffdirection
peat repository
fill area
cut area
stream flow direction
Planning Application Boundary(Leitrim County Council)
Planning Application Boundary(Sligo County Council)
Collector drain
tw
tw
tw
tw
Flowdirection
PlanningApplication
Type Y check damrefer to Detail d
streamflowdirection
Settlement pondrefer to detail A
Check dam @ 20 mcenters
refer to detail c
Flowdirection
Collector drain
sp
sp
sp
sp
DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.
POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection
against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.
2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.
3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.
Discharges4. Water containing silt will not be pumped directly to any natural
watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.
5. No excavated material is to be stored within any surface waterbuffer zone.
6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.
7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.
8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.
Excavations9. Where deep excavations are proposed cut-off drains will be use to
reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.
Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at
any one time will be minimised, as far as practicable.
Site tracks11. Use of track side swales with check dams, and/or filtration check
dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.
Refueling13. Refuelling will be completed in line with CEMP requirements and
away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as
required.
Concrete15. Care will be taken when completing concrete works on site to
ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed
appropriately on site.
If water pollution is identified the followingsteps would be adhered to
STOP - work in the immediate area should be stopped and the sourceof the pollution identified.
CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.
NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.
anagement TypeDescription of SUDS Drainage Control
ethods
AvoidanceControls
1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather
Source Controls:
1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles
In-Line Controls:
1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds
Water TreatmentControls:
1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags
Outfall Controls:
1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs
mitigation / drainage cointrols availablefor use across the site
twtw
twtw
silt fencedetail F
Proposedculvertdetail b
streamflowdirection
Collector drain
Check dam @ 20 mcentersrefer to detail c
Flowdirection
sp
sp
sp
sp
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: 1:2,000 (A1)
Date: 06/07/2020 Checked By: MG
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Proposed Drainage Layout
Croagh WF
Coillte Teo
Figure No:
Ordnance Survey Ireland Licence No. EN 0044720
© Ordnance Survey Ireland/Government of Ireland
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
40
Metres
0 80 120 160 200
Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.
KEY PLAN
0511-33A/1
Drawing No: P1459-0-0620-A1-0511-33A-00A
0511-33A
10001000
4000
10000
swale to be widened at entry to pond
INLET- divert roadside ditchinto settlement pond
100mm single sized stoneplaced at entrance to settlement pondand and within forebay area
initial stilling check damconstructed from20-40mm clean stone core with200mm cover of 100mm single size stone
geotextilewrap
1000 11250 3000
75
0
800
1000
100
discharge collector ditch
outflow control levelto be set 500mmbelow top of gabion
permenant water level
gabion basketmain settlement pond sediment forebay
100mm single sized stoneplaced at entrance to settlementpond and and within forebay area
forebay to be cleanedout regularly
Embankments to be constructedfrom suitable excavated
materials. Post constructionphase embankment materials to
be used to infill pond.phasing of infill to be agreed
with SUDS designer
YY'ZZ'
200
750
storage depth
discharge level
geotextile wrap embeddedinto embankment to preventpreferential flow alongedge of gabion basket
Silt will collect in the base of thesettlement pond. This will have tobe cleaned out regularly. Silt buildup should be monitored on site.
extend boundary bermsto prevent overflow
geotextilewrap
overflow dischargeto collector ditch
6250
1400 4000
invert ofinlet v-ditch
bed slope 1:50max.
20-40mm filtrationstone placed priorto gabions
SECTION
SCALE 1:100
SECTION
SCALE 1:100
ZZ'
YY'
ACCESS TRACK
ACCESS TRACK
TE A - TICAL ROAD SIDE SETTLEET OD DETAILSCALE 1:200 (NOTE DIMENSIONS VARY DEPENDING ON CATCHMENT SIZE - see attached table)
Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
Road
Timberstake
hy-tex terrastoppremium silt fence
Sediment fence/check dam detail
Bank
Bank
2000
4000 4000 4000
1500
4x2" knife edge weir 4x2" knife edge weir
20mm plywood sheet 20mm plywood sheet 20mm plywood sheetLaminar
flow in 2000
Forestry drains(applicable only
in forestry areas)
Block 5 forestry drains down slope of a outlet toprevent pollution to
reveiving waters
Blocked
BlockedSmall, medium & largestone filter beds
200
500
1000
20mm plywood sheet
Bank
4000 4000 4000
1500
200
Top of bank
4x2" knife edge weir 4x2" knife edge weir
Small, medium & largestone filter beds
Geotextile betweenbed to stop mixing of stone sizes
200
500
1000
20mm plywood sheet
200
500
1000
20mm plywood sheet
1000 gauge impereable polythene 1000 gauge impereable polythene
Laminar flow in drain
Outflow
Groundlevel
Sheet flow out overexisting vegetation or
into forest drain
Bank Bank
Top of bankTop of water
level
Top of bank
1000
500
2000
Section 11'
Section 22'
1'1
2'
2
TE B - TICAL ROAD SIDE SETTLEET OD DETAILSCALE 1:200 (NOTE DIMENSIONS VARY DEPENDING ON CATCHMENT SIZE - see attached table)
Pond Size m x L m x D m Catchment Size (m)
Return Period 50 yrs Storm Duration 500 1000 2000
6hr retention for coarse silt 6 hrs 2.8 x 9 x 1 m 4 x 13 x 1 m 5.7 x 18 x 1 m
11hr retention for medium silt 12 hrs 3.2 x 10 x 1 m 4.5 x 14 x 1 m 6.4 x 20 x 1 m
24hr retention for fine silt 24 hrs 3.5 x 11 x 1 m 5 x 16 x 1 m 7 x 22 x 1 m
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: as shown (A1)
Checked By: M.G.
Drawn By: MG/GD
Project No.: P1459-0
Client:
Job:
Title:
Drainage Details 1
Croagh WF
Drawing No: P1459-0-0720-A1-0511-34A-00A
Figure No: 0511-34A
DETAIL A1
DETAIL A2
MGMGPlanning
Coilte teo
Date: 07/07/2020
07/07/20
Example settlement pond sizes
type x - check dam detailcale
road side ditch twl
stone check dam20-40mm drainage stone
provide geotextilewrap if necessary
access roadway
road side ditch
-
-
mm
LONGITUDINAL ELEVATION
PLAN
stone check dam20-40mm drainagestone
provide geotextilewrap if necessary
side long view of access roadway surface
type y - check dam detailscale 1:100
side long view of access roadway surface
road side ditch/ditch twl
stone check dam20-40mm drainage stone provide geotextile
wrap if necessary
access roadway
road side ditch / ditch
direction of flow
provide geotextilewrap if necessary
ground level
34"marine plywood baffleplate 300mm embedded
into base of drain / ditch
twl
fencing post driveninto peat/subsoil forlateral support
VARIE
S -
20
0
stone check dam20-40mm drainage stoneplywood embedded 200mm
into sidewall of ditch
LONGITUDINAL ELEVATION
PLAN
Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.
Drainage Design Notes
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
accessroad
top of bank
plancollector ditch
toe of bank
silt fence
outfall protection berm
existingculvet
top of bank
access road
outfall protection berm
toe of bank
izometric view
collector ditch
existing culvet
silt fence
schematic - not to scaleCULVET - OUTFALL PROTECTION DETAIL
existingforestrydrains
existing forestry drains
mm m
in
mm m
in
Spill
way
MM m
in
note: spacing of check dams along centreline and scour protectionbelow each check dam
spillway
needle punchedgeofabric on downstreamspillway protection toprevent erosion
bag fill material eitheraggregate, sand or drysand - cement mixture
schematic - not to scale
TEMPORARY CHECK DAM / SETTLEMENT POND OVERFLOWSAND FILLED BAG CONSTRUCTION
A B
lenth ch that point a and have eal elevation
check damerosion protection
elevation
schematic - not to scaleTEMPORARY CHECK DAM / SETTLEMENT POND OVERFLOW
'x' +600 Max.
m
in
'x'
single layer geosyntheticOR FELLED FOREST LOGSSUITABLE AGGRAGATE FILL
DRAINAGE PIPE IF REQUIRED
ROAD LEVEL
SCALE 1:100
max
750
min
.
ROAD CONSTRUCTIONCAPPING MATERIAL/
DIAMETER VARIESDRAINAGE PIPE,
503.3 (1) OF THE NRAFILL MATERIAL TO CL.
SPEC. FOR ROADWORKS
ROAD LEVEL
SCALE 1:50
'x' +300 Min.
TRENCH WIDTH=
'TYPE B' CULVERT - DRAINAGE CROSSING BENEATH EXCAVATED ROAD
'TYPE A' CULVERT - DRAINAGE CROSSING BENEATH FLOATING ROAD
reinforcement / separation
refer to client standard detail for road make up
refer to client standard detail
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: as shown (A1)
Checked By: M.G.
Client:
Job:
Title:
Figure No: -A
DETAIL C DETAIL D
DETAIL B
DETAIL C
DETAIL C
DETAIL B
Drawn By: MG/GD
Project No.: P1459-0
Croah WF
Drainae Detail
Drawing No: P1459-0-0720-A1-0511-35A-00A
MGMGPlanning
Coilte teo
Date: 07/07/2020
07/07/20
distributor drain
collector drain
overland discharge oroutfall to watercoursevia settlement pond
vegetation swale
lined with slightlyraised peat turves
typical vegetation swale - planscale 1:250
check dam locations
A
A
'
B
B
'
G.L.
Mineral Soil
raised/contouredpeat blocks
top of peat blocks to beapprox 200 mm higher thanadjacent undisturbed ground
peatcatotelm peat mass
upper vegetationlayer and root zone regulation layer of
placed peatapprox 200 mm
G.L.
Mineral Soil
contoured raisedturves along edgeof vegetation swale
peatcatotelm peat mass
upper vegetationlayer and root zone
collector ditch
distributor ditch
~7.5 to 15m
AA'SCALE 1:200ECTIN
BB'SCALE 1:100ECTIN
silt fencescale 1:25
MIN. 1000
material stockpile
in-situ peat
Stakes driven500-700mm intoground
Staple holds Geotextilefilter fabric in place
silt fence embedded100mm into ground
Refer to Habitat management Planand Peat Management PLan
for Stockpile management notes
Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
road constructionas per client
standard details
Staple holds Geotextilefilter fabric in place
Stakes driven500-700mm into ground
Geotextileembedded 200mm
silt fence for watercourse protectionscale 1:25
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: as shown (A1)
Checked By: M.G.
Client:
Job:
Title:
Drainage Details 3
Figure No: 0511-36A
DETAIL E
DETAIL F-1
DETAIL F-I1
Drawn By: MG/GD
Croagh WF
Project No.: P1459-0
Drawing No: P1459-0-0720-A1-0511-36A-00A
MGMGPlanning
Coilte teo
Date: 07/07/2020
03/06/20
Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.
HYDROENVIRONMENTALSERVICES
22 Lower Main StDungarvan
Co. WaterfordIreland
tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: [email protected]: www.hydroenvironmental.ie
Collector drain
W'W
Accessroad
Collector ditch
Edge protectionTop of bank
Toe of bank
Silt fence
Accessroad
Collector drain
Ground levelSkallow
collectorditch
Edgeprotection
Siltfence
Groundlevel
Placed roadedge material
2
1
Spillway outfall
Silt fence
Edge protection
Collector ditch
Access road
Collector drain
SpillwayY'Y
X'
X
Settlement pond
Settlement pond
Settlement pond
PLA
SECTI WW'
IETIC IEW
spillwa outfall planschematic - not to scale
750
6750
150
300
SIDE ELEATI
PLADrainage pipecut in half andlinked togetherwith chain link and rivets
Pipe can be placed on
uneven groundand creates
flow channel andprevents erosion
X
X'
XX'
TYPICAL PIPE SPILLWAY DETAIL
YY'
scale 1:50
Steep batter to beprotected
6D
Diversion bankDown drain
Inlet stabilisedwith sandbags
Pipe slope 3% of steeper Flexible pipe
3D+0.6m1,3m at less
than 1% grade
d
schematic - not to scaleTYPICAL PIPE SPILLWAY DETAIL
3000
3000
TEPA CNCETE ASH T PIT
Plan
ELEATIN
stop log
concrete lorry
stop log500
2000 gaugepolythene
SCALE 1:50
SignedChkdDescriptionDate
Revisions
Sheet Size: A1
Scale: as shown (A1)
Checked By: M.G.
Client:
Job:
Title:
Drainage Details 4
Figure No: 0511-37A
DETAIL H
DETAIL G
DETAIL I
Drawn By: MG/GD
Croagh WF
Coilte teo
Project No.: P1459-0
Date: 07/07/2020
Drawing No: P1459-0-0720-A1-0511-37A-00A
MGMGPlanning07/07/20