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Hammond Ground, Read
Flood Risk Assessment and Drainage Management Strategy
FRA317-HAMMOND.GROUND_FRA&DMS
APPENDIX F: UU SEWER RECORDS & CORRESPONDENCE
This page has been left intentionally blank
1
Chris Pickles
From: Wastewater Developer Services <[email protected]>Sent: 17 July 2015 11:13 AMTo: Chris PicklesSubject: RE: Hammond Ground, Read, Lancashire, BB12 7RH
Hi I can confirm that there are no recorded historical sewer flooding issues within the vicinity of the proposed development site. Please note that United Utilities Water plc (UUW) can only record and check flooding events which are reported to us and we have to comply with our Regulators instructions on the qualification of flooding events to place on the ‘at risk’ register.
Also, this does not include any sewer flooding events caused by blockages or collapses which are the result of third party actions, natural events or other actions over which UUW has no control and not a facet of sewer capacity. Should you require any further information please do not hesitate to contact me. Thanks sue
If you have received a great service today why not tell us? Visit: unitedutilities.com/wow Sue King Developer Services Assistant Developer Services and Planning Operations Control United Utilities T: 01925 679413 (internal 79413) unitedutilities.com
From: Chris Pickles [mailto:[email protected]] Sent: 17 July 2015 09:16 To: Wastewater Developer Services Subject: Hammond Ground, Read, Lancashire, BB12 7RH To whom it may concern,
Hammond Ground, Read, Lancashire, BB12 7RH Please could you confirm whether you have any information that you feel would be valuable to a Flood Risk Assessment for the above site (location plan attached), including details of historical flooding; this would be greatly appreciated.
2
Please do not hesitate to contact me on the details below to discuss further should you require additional information or clarification. Kind regards Chris Christopher Pickles Flood Risk & Engineering Technician Betts Associates Ltd Old Marsh Farm Barns, Welsh Road, Sealand, Flintshire, CH5 2LY T ‐ 01244 288178 F ‐ 01244 288516 chris.pickles@betts‐associates.co.uk www.betts‐associates.co.uk CIVIL | STRUCTURAL | GEO‐ENVIRONMENTAL | TECHNICAL DUE DILIGENCE FLOOD RISK MANAGEMENT | STRUCTURAL SURVEYS | PARTY WALL DUTIES | ECOLOGY ELECTRONICALLY TRANSMITTED INFORMATION This electronic transmission is strictly confidential and intended solely for the addressee. It may contain information which is covered by legal, professional or other privilege. If you are not the intended addressee, you must not disclose, copy or take any action in reliance of this transmission. If you have received this transmission in error, please notify us as soon as possible. All emails transmitted by Betts Associates are virus checked. This does not guarantee that transmissions are virus free. Reference should always be made to the hard copy of any electronically transmitted files. Electronic data does not constitute contract documentation. Use of the content of our files is at your own risk. You remain responsible for anything produced using all or part of the data supplied.
EMGateway3.uuplc.co.uk made the following annotations --------------------------------------------------------------------- The information contained in this e-mail is intended only for the individual to whom it is addressed. It may contain legally privileged or confidential information or otherwise be exempt from disclosure. If you have received this Message in error or there are any problems, please notify the sender immediately and delete the message from your computer. You must not use, disclose, copy or alter this message for any unauthorised purpose. Neither United Utilities Group PLC nor any of its subsidiaries will be liable for any direct, special, indirect or consequential damages as a result of any virus being passed on, or arising from the alteration of the contents of this message by a third party. United Utilities Group PLC, Haweswater House, Lingley Mere Business Park, Lingley Green Avenue, Great Sankey, Warrington, WA5 3LP Registered in England and Wales. Registered No 6559020 www.unitedutilities.com www.unitedutilities.com/subsidiaries ---------------------------------------------------------------------
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1
Kirsty Williams
From: Perry, Graham <[email protected]>Sent: 09 September 2015 16:10To: Kirsty WilliamsSubject: FW: DE1446 - Hammond Ground, Read. Burnley Due by 17.09.2015Attachments: UU-Wastewater_predevelopment_enquiry.pdf
Hello Kirsty We have carried out an assessment of your application which is based on the information provided; this predevelopment advice will be valid for 12 months Foul
Foul will be allowed to drain to the public combined/ foul sewer network. Our preferred point of discharge would be to the combined sewer located at the junction of Whalley Rd & Westgate Surface Water Surface water from this site should drain to either soak away or directly to watercourse to the south or to the west. Discharge rates and consents must be discussed and agreed with all interested parties. Under no circumstances should surface water be allowed to drain to the combined sewer as this would potentially cause flooding issues downstream. Connection Application Although we may discuss and agree discharge points & rates in principle, please be aware that you will have to apply for a formal sewer connection. This is so that we can assess the method of construction, Health & Safety requirements and to ultimately inspect the connection when it is made. Details of the application process and the form itself can be obtained from our website by following the link below http://www.unitedutilities.com/connecting-public-sewer.aspx Sewer Adoption Agreement You may wish to offer the proposed new sewers for adoption. United Utilities assess adoption application based on Sewers adoption 6th Edition and for any pumping stations our company addenda document. Please refer to link below to obtain further guidance and application pack: http://www.unitedutilities.com/sewer-adoption.aspx Existing Asset Crossing the Site There are two existing easements that cross the site which do not appear to have any connection to our wastewater assets. Therefore I would recommend that you contact our clean water team to see if the easements protect water mains and they will cause issue on your proposed development. Please be aware that on site drainage must be designed in accordance with Building Regulations, National Planning Policy, Planning Conditions and local flood authority guidelines, we would recommend that you liaise and make suitable agreements with the relevant statutory bodies. Regards
2
Thanks Graham Perry Development Engineer Developer Services and Planning Operational Services United Utilities T: 01925 679405 (internal 79405) unitedutilities.com
If you have received a great service today why not tell us? Visit: unitedutilities.com/wow
From: Wastewater Developer Services Sent: 27 August 2015 11:08 To: Perry, Graham Subject: DE1446 - Hammond Ground, Read. Burnley Due by 17.09.2015 FYI Regards, Will Harrison Technical Administrator Developer Services & Planning Operational Control United Utilities T : 01925 679319 E : [email protected]
If you have received a great service today why not tell us? Visit: unitedutilities.com/wow United Utilities Water Ltd. - Developer Services and Planning Warrington North Wastewater Treatment Works Barnard Street Off Old Liverpool Road Gatewarth Industrial Estate Warrington WA5 1DS
From: Kirsty Williams [mailto:[email protected]] Sent: 26 August 2015 13:12 To: Wastewater Developer Services Subject: Pre-Dev Enquiry - Hammond Ground, Read To Whom It May Concern,
3
We are currently preparing a preliminary drainage strategy to support an outline planning application for a residential development in Read, Lancashire; we are looking for any drainage advice specific to this area in order to determine feasibility of the strategy and are hoping that we can obtain an agreement in principle to the preliminary drainage strategy in order to support the FRA and in turn the planning application. I have briefly summarised the proposals below and attached the pre‐development enquiry pack, we would greatly appreciate your feedback on the proposals and look forward to a response. Due to the early stage, the development area has not yet been defined; we have assumed that the development area will be a small portion of the wider site boundary as illustrated in the plans attached; the development area will be defined following receipt of the various consultee responses and consultation reports supporting the application; development will be steered to the most suitable location within the wider site boundary. We have drafted a drainage strategy which is proposing that the surface water generated by the development area discharge to the watercourse bisecting site (should infiltration be proved not feasible); the strategy is proposing the use of various SuDS features to convey and attenuate flows onsite (including a pond, swales and rills). The foul water generated by the residential development is proposed to outfall to the public combined sewer network adjacent to site (see attached plan). Two potential points for connection have been identified, we do not have accurate invert levels at this time however it is understood from review of the topo survey that a gravity connection to one of the identified points would be feasible. The gravity connection lies within adjacent Third Part Land (UU Ref. 2300) and therefore constraints are present which have been identified within the FRA; requisition for the gravity connection may be possible although further discussion with UU has been recommended. The alternative option is a pumped solution from the development area to the combined network to the east of Whalley Road (UU Ref. 4400). The drainage strategy detailed above is only a strategy at this time, no hydraulic simulation has been undertaken and therefore detailed design will be required to confirm feasibility. I trust the above is sufficient to allow you to review the strategy however if you require any additional information please do not hesitate to contact me on the details below. Kind Regards Kirsty Williams Graduate Flood Risk Analyst Betts Associates Ltd Old Marsh Farm Barns, Welsh Road, Sealand, Flintshire, CH5 2LY T ‐ 01244 288178 kirstywilliams@betts‐associates.co.uk www.betts‐associates.co.uk CIVIL | STRUCTURAL | GEO‐ENVIRONMENTAL | TECHNICAL DUE DILIGENCE FLOOD RISK MANAGEMENT | STRUCTURAL SURVEYS | PARTY WALL DUTIES | ECOLOGY ELECTRONICALLY TRANSMITTED INFORMATION This electronic transmission is strictly confidential and intended solely for the addressee. It may contain information which is covered by legal, professional or other privilege. If you are not the intended addressee, you must not disclose, copy or take any action in reliance of this transmission. If you have received this transmission in error, please notify us as soon as possible. All emails transmitted by Betts Associates are virus checked. This does not guarantee that transmissions are virus free. Reference should always be made to the hard copy of any electronically transmitted files. Electronic data does not constitute contract documentation. Use of the content of our files is at your own risk. You remain responsible for anything produced using all or part of the data supplied.
Hammond Ground, Read
Flood Risk Assessment and Drainage Management Strategy
FRA317-HAMMOND.GROUND_FRA&DMS
APPENDIX G: LPA/LLFA CORRESPONDENCE
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1
Chris Pickles
From: Chris PicklesSent: 17 July 2015 9:16 AMTo: '[email protected]'Subject: Hammond Ground, Read, Lancashire, BB12 7RHAttachments: LOCATION PLAN.pdf
To whom it may concern,
Hammond Ground, Read, Lancashire, BB12 7RH Please could you confirm whether you have any information that you feel would be valuable to a Flood Risk Assessment for the above site (location plan attached), including details of historical flooding; this would be greatly appreciated. Please do not hesitate to contact me on the details below to discuss further should you require additional information or clarification. Kind regards Chris Christopher Pickles Flood Risk & Engineering Technician Betts Associates Ltd Old Marsh Farm Barns, Welsh Road, Sealand, Flintshire, CH5 2LY T ‐ 01244 288178 F ‐ 01244 288516 chris.pickles@betts‐associates.co.uk www.betts‐associates.co.uk CIVIL | STRUCTURAL | GEO‐ENVIRONMENTAL | TECHNICAL DUE DILIGENCE FLOOD RISK MANAGEMENT | STRUCTURAL SURVEYS | PARTY WALL DUTIES | ECOLOGY ELECTRONICALLY TRANSMITTED INFORMATION This electronic transmission is strictly confidential and intended solely for the addressee. It may contain information which is covered by legal, professional or other privilege. If you are not the intended addressee, you must not disclose, copy or take any action in reliance of this transmission. If you have received this transmission in error, please notify us as soon as possible. All emails transmitted by Betts Associates are virus checked. This does not guarantee that transmissions are virus free. Reference should always be made to the hard copy of any electronically transmitted files. Electronic data does not constitute contract documentation. Use of the content of our files is at your own risk. You remain responsible for anything produced using all or part of the data supplied.
1
Chris Pickles
From: Flood Risk Management <[email protected]>Sent: 11 August 2015 12:47 PMTo: Chris PicklesSubject: HFI Request: Hammond Ground, ReadAttachments: FRM_INFO_51_TM - Hammond Ground.pdf
Dear Chris Pickles, Please find attached your completed HFI Request. Yours Sincerely, Terry McCormick Graduate Civil Engineer Community Services Lancashire County Council T: 01772 530978 W: www.lancashire.gov.uk
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Flood Risk Information Request Hammond Ground, Read, Lancashire, BB12 7RH DATE OF REPORT: 11th August 2015
Flood Risk Information Request
• 2 •
Introduction
Lancashire County Council is the Lead Local Flood Authority (LLFA) for the County Council's
administrative area. The Flood and Water Management Act (FWMA) sets out the
requirement for the LLFA to manage local flood risk within their area.
It is advised that flooding from "local" sources (surface water, groundwater and flooding
from ordinary watercourses) is taken into consideration, where possible, and especially
where there is a known flooding issue in an area.
This package includes:
a) Historical flood maps
b) Flood zones 2 and 3
c) Flood warning areas
d) Surface Water Susceptibility
e) Ground Water Susceptibility
f) Main rivers
g) Fluvial flood areas
h) Tidal flood area
i) Flood defences
j) Flood storage areas
k) Reservoirs
l) Highway drainage nodes
m) Highway drainage pipes
n) Highway drainage ponds
o) Highway Gullies
p) Ecology Standing Advice Consultation Zones
q) Public Enquiry Management System
r) Section 19 Flood Investigation records
s) Ordinary Watercourse Consenting and Enforcement register
Flood Risk Information Request
• 3 •
Section 1. Information Request
Lancashire County Council has been instructed to execute a search for historical flooding in
relation to a Flood Risk Assessment which Betts-Associates are conducting on the site.
Betts-Associates have requested the provision of any information which may be valuable to
a Flood Risk Assessment of the site.
Section 2. Site Location
The map below shows the location of the site to which this report relates. The red line
outlines the boundary of the proposed site area.
This map is reproduced from Ordnance Survey material with the Permission of Ordnance Survey on behalf of the Controller of Her Majesty's Stationery Office (C) Crown Copyright. Unauthorised reproduction may lead to prosecution or civil proceedings. Lancashire County Council - OS Licence 100023320 (C) Centre of map: 376320:434527
Flood Risk Information Request
• 4 •
Section 3. Lancashire County Council Report
a. Historical Flood Maps:
The Flood Risk Management Team (FRM) has no record of any historical flooding within the
proposed site.
b. Flood Zones 2 and 3:
These Flood Zones refer to the probability of river and sea flooding, ignoring the presence
of defences.
Flood Zone 2 (medium probability) is defined as land having between a 1 in 100 and 1 in
1,000 annual probability of river flooding; or land having between a 1 in 200 and 1 in 1,000
annual probability of sea flooding.
Flood Zone 3 (high probability) is defined as land having a 1 in 100 or greater annual
probability of river flooding; or land having a 1 in 200 or greater annual probability of sea
flooding.
Our records indicate that the proposed site is not located within Flood Zones 2 or 3.
Refer to Appendix A.
c. Flood Warning Areas:
Our records indicate that the proposed site is not located within a flood warning area.
d. Surface Water Susceptibility
Our records indicate that the proposed site is located within an area susceptible to surface
water flooding. This runs South-West to North-East across the site, with additional areas
leading away from this main thread.
Refer to Appendix B.
e. Ground Water Susceptibility
Our records indicate that the proposed site is located within an area susceptible to
groundwater flooding. This area predominantly carries a risk of ground water flooding in
the range of 25% to 50%.
Refer to Appendix C.
The FRM Team has no record of any recent groundwater flooding occurring at this location.
f. Main Rivers
Our records indicate that the nearest Main Rivers located within the surrounding area of
the proposed site are the River Calder (approximately 550m South-West of the site) and
Sabden Brook (approximately 830m North-West of the site.
Refer to Appendix D.
Flood Risk Information Request
• 5 •
g. Fluvial Flood Watch Area:
Our records indicate that the proposed site is located within a fluvial flood watch area
which forms part of the Calder Catchment. This area encompasses the Rivers Calder, Brun,
Don and Pendlewater, from Laneshaw Bridge to the River Ribble including Trawden,
Burnley, Nelson, Colne, Accrington and Whalley.
Refer to Appendix E.
h. Tidal Flood Watch Areas:
Our records indicate that the proposed site is not located within a tidal flood watch area.
i. Flood Defences:
Our records indicate that there are no known flood defences located within the proposed
site.
j. Flood Storage Areas:
Our records indicate that there are no known flood storage areas located within the
proposed site.
k. Reservoirs:
Our records indicate that there are no known reservoirs located within the proposed site.
l. Highway Drainage Nodes:
Our records indicate that there are no known highway drainage nodes located within the
proposed site.
m. Highway Drainage Pipes:
Our records indicate that there are no known highway drainage pipes located within the
proposed site.
n. Highway Drainage Ponds:
Our records indicate that there are no known highway drainage ponds located within the
proposed site.
o. Highway Gullies:
Our records indicate that there are no known highway gullies located within the proposed
site. There are however, a number of highway gullies located within the surrounding area.
These are situated along the Southern boundary of the site, along Whalley Road (A671),
and along the Eastern edge of the site, along George Lane.
Refer to Appendix F.
Flood Risk Information Request
• 6 •
p. Ecology Standing Advice Consultation Zones:
Our records indicate that the proposed site is located within an Ecology Standing Advice
Consultation zone. This zone extends from inside the Eastern edge of the site out to the
North, West and South-West.
These zones are areas of high ecological interest and could be adversely affected by
development. For that reason, consultation is required should development takes place at
this location.
There are also Ecology Standing Advice Consultation Zones in the near vicinity of the
surrounding area.
Refer to Appendix G.
q. Lancashire County Council's Public Enquiry Management System:
Following a review of the Lancashire County Council's Public Enquiry Management System,
no records have been identified within close proximity of the proposed site.
r. Section 19 Flood Investigation Records:
Following a review of the Lancashire County Council's Flood Investigation Record Sheet, no
records have been identified within close proximity of the proposed site.
s. Ordinary Watercourse Consenting and Enforcement register
Following a review of the Lancashire County Council's Ordinary Watercourse Consenting
and Enforcement register, no records have been identified within close proximity of the
proposed site.
Flood Risk Information Request
• 7 •
Section 4. Supplementary Information
4.1 – Ordinary Watercourses
Our records indicate that there is an Ordinary Watercourse, open or culverted, located
within the proposed site.
Any surface water connections and/or modifications to the banks or beds of an ordinary
watercourse will require Land Drainage Consent from Lancashire County Council. Please
note that Lancashire County Council currently follows the Environment Agency's guidelines
of requesting 8m easements around watercourses for future maintenance purposes.
4.2 – Sustainable Drainage Systems (SuDS)
Details of the LLFA's position regarding SuDS can be found using the following link:
http://www.lancashire.gov.uk/council/planning/sustainable-drainage-systems.aspx
4.3 – Flood Risk Management Strategy
Details of Lancashire County Council Flood Risk Management Strategy can be found using
the following link:
http://www.lancashire.gov.uk/council/strategies-policies-plans/environmental/lancashire-
and-blackpool-flood-risk-management-strategy.aspx
4.4 – Pre-Application Advice
The LLFA is unable to offer a bespoke site-specific pre-application service to developers at
present.
We have produced Pre-Application Standing Advice to provide a helpful interim
framework and act as a signpost in relation to surface water management. We have
published this on our webpage:
http://www.lancashire.gov.uk/council/planning/sustainable-drainage-systems.aspx
The LLFA will be developing a comprehensive pre-application service in the near future in
which we hope to offer advice on a site-specific basis.
4.5 – Strategic Major Developments
For strategic major developments the LLFA would like the opportunity to engage in
discussions once a formal pre-application has been received by the Local Planning
Authority and the LLFA has been notified of such by the Local Planning Authority.
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Hammond Ground, Read
Flood Risk Assessment and Drainage Management Strategy
FRA317-HAMMOND.GROUND_FRA&DMS
This page has been left intentionally blank
Hammond Ground, Read
Flood Risk Assessment and Drainage Management Strategy
FRA317-HAMMOND.GROUND_FRA&DMS
APPENDIX H: SURFACE WATER RUN-OFF CALCULATIONS
This page has been left intentionally blank
Betts Associates Ltd Page 1
Old Marsh Farm Barns Hammond Ground
Welsh Road Read
Sealand Flintshire ...
Date 19.08.15 Designed by KW
File Checked by RDN
Micro Drainage Network 2013.1.1
Rainfall profile
©1982-2013 Micro Drainage Ltd
Storm duration (mins) 360
FEH DataC(1km) -0.026D1(1km) 0.389D2(1km) 0.381D3(1km) 0.388E(1km) 0.303F(1km) 2.454
Peak Intensity (mm/hr) 15.261Ave. Intensity (mm/hr) 3.893Return Period (years) 1
Betts Associates Ltd Page 1
Old Marsh Farm Barns Hammond Ground
Welsh Road Read
Sealand Flintshire ...
Date 19.08.15 Designed by KW
File Checked by RDN
Micro Drainage Network 2013.1.1
Rainfall profile
©1982-2013 Micro Drainage Ltd
Storm duration (mins) 360
FEH DataC(1km) -0.026D1(1km) 0.389D2(1km) 0.381D3(1km) 0.388E(1km) 0.303F(1km) 2.454
Peak Intensity (mm/hr) 36.347Ave. Intensity (mm/hr) 9.272Return Period (years) 30
Betts Associates Ltd Page 1
Old Marsh Farm Barns Hammond Ground
Welsh Road Read
Sealand Flintshire ...
Date 19.08.15 Designed by KW
File Checked by RDN
Micro Drainage Network 2013.1.1
Rainfall profile
©1982-2013 Micro Drainage Ltd
Storm duration (mins) 360
FEH DataC(1km) -0.026D1(1km) 0.389D2(1km) 0.381D3(1km) 0.388E(1km) 0.303F(1km) 2.454
Peak Intensity (mm/hr) 49.644Ave. Intensity (mm/hr) 12.664Return Period (years) 100
Betts Associates Ltd Page 1
Old Marsh Farm Barns
Welsh Road
Sealand Flintshire ...
Date 25.04.16 Designed by kirstywil...
File Checked by
Micro Drainage Source Control 2013.1.1
ICP SUDS Mean Annual Flood
©1982-2013 Micro Drainage Ltd
Input
Return Period (years) 1 Soil 0.450Area (ha) 2.688 Urban 0.000SAAR (mm) 1154 Region Number Region 10
Results l/s
QBAR Rural 21.2QBAR Urban 21.2
Q1 year 18.4
Q1 year 18.4Q30 years 35.9Q100 years 44.1
Betts Associates Ltd Page 1
Old Marsh Farm Barns
Welsh Road
Sealand Flintshire ...
Date 25.04.16 Designed by kirstywil...
File Checked by
Micro Drainage Source Control 2013.1.1
Greenfield Runoff Volume
©1982-2013 Micro Drainage Ltd
FEH Data
Return Period (years) 1Storm Duration (mins) 360
Site Location GB 375900 433900 SD 75900 33900C(1km) -0.026D1(1km) 0.389D2(1km) 0.381D3(1km) 0.388E(1km) 0.303F(1km) 2.454
Areal Reduction Factor 1.00Area (ha) 2.688SAAR (mm) 1154
CWI 123.710SPR Host 36.580
URBEXT (1990) 0.0439
Results
Percentage Runoff (%) 37.17Greenfield Runoff Volume (m³) 233.380
Betts Associates Ltd Page 1
Old Marsh Farm Barns
Welsh Road
Sealand Flintshire ...
Date 25.04.16 Designed by kirstywil...
File Checked by
Micro Drainage Source Control 2013.1.1
Greenfield Runoff Volume
©1982-2013 Micro Drainage Ltd
FEH Data
Return Period (years) 100Storm Duration (mins) 360
Site Location GB 375900 433900 SD 75900 33900C(1km) -0.026D1(1km) 0.389D2(1km) 0.381D3(1km) 0.388E(1km) 0.303F(1km) 2.454
Areal Reduction Factor 1.00Area (ha) 2.688SAAR (mm) 1154
CWI 123.710SPR Host 36.580
URBEXT (1990) 0.0439
Results
Percentage Runoff (%) 42.55Greenfield Runoff Volume (m³) 869.002
SURFACE WATER RUN-OFF CALCULATION SHEET
Development
Project No.
Revision Completed by
Date Checked by
4.089 ha SAAR 1154 mm
2.688 ha SPR 36.58 %
0.000 ha i1 15.3 mm/hr
0.000 ha i30 36.3 mm/hr
4.089 ha i100 49.6 mm/hr
2.688 ha d1 14.8 mm
0.877 ha d100 74.9 mm
ha
Run-off Rates Volumes
Pre-development Pre-development
1yr 0.0 l/s 1yr 0.0 cu.m
30yr 0.0 l/s 100yr 0.0 cu.m
100yr 0.0 l/s 1yr 233.4 cu.m
50mm/hr 0.0 l/s 100yr 869.0 cu.m
1yr 18.4 l/s 1yr 233.4 cu.m
30yr 35.9 l/s 100yr 869.0 cu.m
100yr 44.1 l/s
QBar 21.2 l/s Post-development
1yr 18.4 l/s 1yr 129.8 cu.m
30yr 35.9 l/s 100yr+CC 919.6 cu.m
100yr 44.1 l/s 1yr cu.m
Post-development 100yr+CC cu.m
1yr 37.2 l/s
30yr 88.5 l/s -6% -50.6 cu.m
100yr+CC 169.3 l/s cu.m
1yr l/s
30yr l/s
100yr+CC l/s
Quick storage Estimates
low high mean Imp. Area (ha) Max. Discharge (l/s) Rainfall CC
Return Period 1yr 34 77 56 0.877 18.4 PRE-DEV FEH 0
Return Period 30yr 126 221 174 0.877 35.9 RATES FEH 0
Return Period 100yr+CC 229 371 300 0.877 44.1 FEH 10%
Return Period 100yr+CC 261 417 339 0.877 44.1 FEH 20%
Return Period 100yr+CC 326 516 421 0.877 44.1 FEH 40%
Impermeable (domestic only)
Reduction (total)
Reduction (domestic only)
Impermeable (total)
Impermeable (domestic only)
Impermeable
Pervious
Total
Impermeable
Pervious
Total
Impermeable (total)
Proposed Impermeable (total)
Total Site
Proposed Impermeable (domestic only)
Areas Catchment Charateristics
Development Area (for SW Strategy)
Existing Impermeable
Existing Impermeable (for SW Strategy)
Existing Pervious
Existing Pervious (for SW Strategy)
2.0
25.04.16
KW
RDN
Hammond Ground
FRA317
Hammond Ground, Read
Flood Risk Assessment and Drainage Management Strategy
FRA317-HAMMOND.GROUND_FRA&DMS
APPENDIX I: IMPERMEABLE AREAS PLANS
This page has been left intentionally blank
d=
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94.22
94.26
94.38
94.41
9
2
.
8
7
93.31
93.26
9
3
.
6
0
9
3
.
9
2
9
3
.
9
8
9
4
.
1
1
9
4
.
1
3
93.52
93.39
93.27
9
3
.
1
0
9
3
.
5
2
9
3
.
6
9
9
3
.
9
3
9
4
.0
0
9
3
.6
8
9
3
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4
9
3
.6
4
9
3
.
5
2
9
3
.
2
2
9
2
.
7
4
9
2
.
2
7
9
1
.
8
1
9
1
.
0
0
91.41
91.55
91.60
91.68
9
1
.
6
8
9
1
.
7
3
9
1
.
7
9
9
2
.
0
0
9
2
.
0
7
9
2
.
1
0
9
2
.
2
7
9
2
.
3
3
9
2
.
5
5
9
2
.
7
1
9
3
.2
0
9
3
.4
3
9
3
.9
6
94.21
94.7
3
94.9
3
95.0
3
9
5
.5
6
9
5
.9
4
9
6
.0
7
96.29
96.96
97.50
98.3
1
9
9
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5
1
0
0
.1
9
1
0
2
.
3
3
1
0
3
.
2
5
1
0
4
.
2
1
1
0
4
.7
5
1
0
6
.
3
3
1
0
7
.
1
6
1
0
8
.
3
4
1
0
8
.
7
8
1
0
9
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0
1
0
9
.9
1
1
1
0
.
2
0
1
1
0
.
5
9
1
1
0
.
9
0
1
1
1
.
2
2
1
1
3
.
6
4
114.4
9
115.0
7
116.01
1
2
3
.
4
4
1
2
4
.
5
2
1
2
4
.
9
3
1
2
5
.
5
6
1
2
6
.1
8
1
2
7
.
9
3
128.43
128.84
128.81
124.67
124.50
124.12
1
2
3
.9
1
1
2
3
.8
6
124.34
124.37
124.27
124.31
123.98
124.27
124.60
1
2
5
.3
7
126.79
1
2
1
.
9
8
1
2
1
.1
1
9
2
.8
3
9
3
.3
1
9
3
.3
9
93.68
93.83
94.00
94.28
94.74
95.11
97.30
97.79
1
2
2
.0
5
103.76
104.10
104.30
104.75
105.15
105.57
105.93
106.28
106.68
107.08
107.36
107.64
107.77
12
6.1
5
12
6.2
6
12
5.9
3
12
5.4
3
12
6.0
1
12
4.9
4
12
4.6
1
12
4.4
7
12
5.2
4
12
6.7
4
12
7.0
4
12
6.6
1
12
6.5
4
12
7.0
7
12
8.2
4
12
7.7
0
12
7.4
6
12
7.2
7
12
7.5
3
12
8.2
1
11
8.4
0
12
6.8
5
12
6.6
5
12
6.3
5
12
5.4
0
12
8.1
2
1
2
5
.
6
9
1
2
5
.
3
5
1
2
4
.6
0
1
2
5
.
5
0
1
2
5
.
1
1
1
2
4
.2
8
123.73 123.65
1
2
3
.8
1
1
2
4
.
2
4
1
2
4
.
6
0
1
2
5
.1
5
1
2
5
.
8
5
1
2
6
.
4
2
124.0
3
124.0
8
124.0
7
1
2
4
.6
0
1
2
4
.9
3
1
2
5
.
6
6
1
2
6
.
1
5
1
2
6
.
5
6
127.49
1
2
7
.8
2
1
2
7
.9
8
1
2
8
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6
1
2
9
.
0
8
1
2
9
.
6
3
1
2
9
.
2
2
1
2
8
.
5
0
1
2
8
.
3
9
1
2
8
.
2
4
1
2
8
.
4
2
1
2
8
.
5
3
1
2
8
.
7
1
1
2
9
.
0
0
1
2
9
.
6
3
1
2
9
.
7
2
1
2
9
.
1
6
1
2
8
.
8
1
1
2
8
.
5
7
1
2
8
.
5
0
1
2
8
.
3
9
1
2
3
.6
1
1
2
2
.6
5
1
2
4
.
4
6
1
2
4
.2
8
1
2
4
.1
1
123.01
1
2
5
.
3
1
1
2
5
.
1
9
1
2
0
.
7
5
1
2
1
.2
9
1
2
1
.
9
7
1
2
2
.
5
8
1
2
3
.
2
4
1
2
1
.
0
7
1
2
2
.
2
3
1
2
3
.4
0
1
2
3
.7
6
1
2
2
.2
5
1
2
1
.2
6
1
1
7
.
9
5
1
1
8
.
8
9
1
1
9
.
7
3
1
2
0
.
1
4
1
1
9
.
0
8
1
1
9
.
7
7
1
2
5
.
2
6
1
2
4
.
7
1
1
2
4
.
5
0
1
2
3
.
6
9
1
2
6
.
3
3
1
2
5
.
6
5
1
2
5
.7
8
1
2
3
.
5
6
1
2
4
.
0
2
1
2
4
.
5
5
124.48
1
2
6
.
9
2
1
2
7
.1
3
1
2
6
.
3
3
1
2
5
.
5
4
1
2
5
.3
1
1
2
5
.
7
4
1
2
7
.4
7
1
2
7
.2
2
1
2
7
.
0
2
1
2
7
.
5
8
1
2
8
.3
5
9
5
.
1
7
9
6
.
2
9
9
7
.
3
0
9
7
.
3
0
9
6
.
7
2
9
5
.7
5
127.24
1
2
7
.0
2
1
2
6
.9
5
1
2
7
.1
3
1
2
7
.
5
4
1
2
7
.
7
4
1
2
7
.
9
0
1
2
8
.
2
5
1
2
8
.
3
8
1
2
8
.
3
3
1
2
8
.
4
2
1
2
8
.
5
4
1
2
8
.
6
4
1
2
9
.
0
5
1
2
9
.5
6
1
2
9
.6
1
1
2
9
.5
0
1
2
9
.6
2
1
2
9
.4
2
1
2
8
.3
0
1
2
6
.8
1
1
2
6
.6
5
1
2
6
.3
6
1
2
6
.1
2
1
2
5
.6
4
1
2
5
.6
2
1
2
5
.4
7
1
2
5
.4
0
124.79
1
2
4
.5
1
1
2
4
.2
7
1
2
4
.2
9
1
2
4
.3
1
125.05
124.89
124.85
128.28
123.99
1
1
5
.0
1
2
0
.0
1
1
0
.0
100.0
1
0
5
.0
9
5
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1
2
5
.
0
125.0
1
1
0
.
0
1
0
5
.
0
1
0
0
.
0
95.0
100.0
1
0
5
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1
1
6
.0
1
1
7
.
0
121.0
122.0
123.0
1
1
8
.0
1
1
9
.0
124.0
1
0
8
.
0
1
0
9
.
0
1
0
7
.0
1
1
1
.
0
1
1
4
.
0
1
1
2
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1
1
3
.0
1
0
3
.
0
1
0
2
.
0
1
0
1
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104.0
1
0
6
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9
6
.
0
9
7
.
0
9
8
.
0
9
9
.
0
94.0
93.0
9
2
.
0
1
2
8
.
0
1
2
7
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1
2
6
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1
2
7
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1
2
8
.
0
124.0
1
2
2
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123.0
1
2
6
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12
7.0
1
0
8
.
0
1
0
9
.
0
1
1
1
.
0
1
1
2
.
0
1
0
6
.
0
1
0
7
.
0
1
0
1
.
0
1
0
2
.
0
1
0
4
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1
0
3
.0
9
6
.
0
9
7
.
0
9
8
.
0
9
9
.
0
93.0
94.0
96.0
98.0
97.0
99.0
101.0
102.0
103.0
1
0
4
.0
1
0
7
.0
1
0
6
.0
DO
N
OT
S
CA
LE
PR
ELIM
IN
AR
Y
E101
FR
A317
IM
PE
RM
EA
BLE
A
RE
AS
P
LA
N
PR
E-D
EV
ELO
PM
EN
T
RE
AD
HA
MM
ON
D G
RO
UN
D,
NO
TES DE
VELO
PMEN
T AR
EA (4
.089
ha)
PRE-
DEVE
LOPM
ENT
PERV
IOU
S AR
EAS
- 4.0
89ha
(100
%)
PRE-
DEVE
LOPM
ENT
IMPE
RMEA
BLE
AREA
S - 0
.000
ha
d=
.3
b/w
(h
t1.1)
b
/w
(h
t1.3)
d=
.8
5
d=
.9
d=
.9
d=
1
d=
.9
d=
.8
d=
.8
d=
1
d=
.9
d=
.6
5
d=
1.2
d=
.6
5
w
o
o
d
(h
t1.3)
(h
t1.1
)
w
oo
d
(
h
t
1
)w
o
o
d
rid
ge
=1
12
.6
5
ea
v=
11
0.7
7
rid
ge
=1
16
.5
7
ea
v=
11
5.4
3
rid
ge
=1
17
.9
4
ea
v=
11
5.6
1
ea
v=
11
6.7
6
rid
ge
=1
19
.1
2
ea
v=
11
5.6
8
rid
ge
=1
19
.0
4
ea
v=
11
5.6
9
rid
ge
=1
17
.1
5
rid
ge
=1
20
.0
7
ea
v=
11
7.6
6
cl\b
.
(h
t1.2)i
rid
ge
=1
24
.7
0
ea
v=
12
2.0
8
rid
ge
=1
26
.5
1
ea
v=
12
4.3
4
rid
ge
=1
28
.1
9
ea
v=
12
4.9
1
(h
t1.3
)
bric
k w
all
rid
ge
=1
31
.3
8
ea
v=
12
8.0
6
ea
v=
13
0.8
0
rid
ge
=1
35
.1
5
ea
v=
13
2.2
2
(
h
t
1
)
c
/
l
.
(h
t4
)
h
e
d
g
e
ea
v=
13
2.2
1
ea
v=
13
3.5
0
rid
ge
=1
38
.5
2
ea
v=
13
2.1
1
rid
ge
=1
35
.1
3
.06Ï
il=
11
4.6
4
sm
sto
ne
ro
u
g
h
g
ro
u
n
d
p
o
s
t
p
o
s
t
p
o
s
t
p
o
s
t
tarm
ac
tarm
ac
tarm
ac
b/w
(h
t1.1)
b
/
w
(
h
t
1
.
2
)
(h
t1.3)
b
/w
w
oo
d
(h
t1.7)
w
o
o
d
(h
t1.2)
g
r
a
s
s
d=
.6
d=
.6
d=
.7
d=
.8
5
d=
.9
d=
.9
d=
.7
d=
.6
d=
.6
5
d=
1
d=
.7
d=
.9
d=
.8
d=
.7
5
d=
.7
5
d=
.7
5
d=
.9
d=
.9
wa
l=
90
.5
1
wa
l=
12
2.3
9
wa
l=
11
7.1
3
c
l
=
1
2
1
.
9
3
.1Ï
il=
12
2.7
0
(
h
t
.
8
)
s
t
o
n
e
w
a
l
l
sto
ne w
all
(h
t1.6)
d
k
t
.
d
k
t
.
d
k
t
.
d
k
t
.
d
k
t
.
d
k
t.
d
k
t.
dk t
.
dk t
.
dk t.
dk t
.
dk t
.
dk t
.
dk t
.
dk t
.
dk t
.
dk t.
b
t m
h
lp
lp
lp
lp
g
u
=
9
3
.1
6
gu
=94.92
gu
=93.47
gu
=94.94
gu
=96.92
gu
=99.34
gu
=107.66
gu
=101.68
gu
=107.64
gu
=105.93
gu
=103.88
h
e
d
g
e
(h
t1
.8
)
hed
ge
(h
t1.5)
hed
ge
(h
t1.4)
hed
ge
(h
t1.8)
dk t
.
gu
=96.91
si
cl=
107.09
dk t.
dk t.
p
o
t
e
n
t
i
a
l
h
i
s
t
o
r
i
c
c
o
a
l
p
i
t
.1
0
Ï
il=
1
2
3
.1
1
to
p
co
n
c=
123.48
(h
t1.1)
b/w
cl=
95.10
cl=
99.43
cl=
101.64
s
h
e
e
p
p
e
n
d=
.3
b
/
w
(
h
t
1
.
2
)
b
/
w
(
h
t
1
.2
)
d=
.7
d
=
.
2
4d
=
.
3
d=.3
d=
.4
d=
.9
d=
.7
5
d=
.9
d=
.5
d=
.5
w
a
l
l
h
i
d
d
e
n
b
e
n
e
a
t
h
b
a
n
k
i
n
g
f
.
h
y
d
r
d=
.8
d=
.2
5
rid
ge
=1
36
.5
6
rid
ge
=1
39
.4
7
rid
ge
=1
41
.2
9
ea
v=
13
7.8
4
ea
v=
13
6.2
6
ea
v=
13
3.5
9
ea
v=
13
3.6
6
rid
ge
=1
34
.7
5
(
h
t
1
.
1
)
c
/
l
.
(
h
t
1
)
s
t
o
n
e
w
a
l
l
s
t
o
n
e
w
a
l
l
(
h
t
1
.
3
)
(
h
t
2
)
h
e
d
g
e
h
e
d
g
e
(
h
t
2
)
b
t
c
l
=
1
2
8
.
3
2
c
l
=
1
2
8
.
4
8
c
l
=
1
2
9
.
1
3
c
l
=
1
2
8
.
5
8
c
l
=
1
2
5
.
3
0
g
u
=
1
2
8
.
9
1
g
r
a
s
s
g
r
a
s
s
g
r
a
s
s
t
a
r
m
a
c
w.
w.
lp
rid
ge
=1
42
.5
8
rid
ge
=1
40
.8
7
rid
ge
=1
37
.0
8
ea
v=
13
5.0
8
ea
v=
13
7.6
0
rid
ge
=1
33
.1
9
rid
ge
=1
35
.9
7
ea
v=
13
3.3
7
rid
ge
=1
35
.4
0
ea
v=
13
1.4
5
ea
v=
13
1.5
5
ea
v=
13
3.3
4
ea
v=
13
0.9
6
rid
ge
=1
35
.2
4
w
oo
d
(h
t1.2)
co
nc.
rid
ge
=1
35
.1
1
rid
ge
=1
35
.5
7
ea
v=
13
3.5
1
rid
ge
=1
35
.4
1
ea
v=
13
3.8
4
rid
ge
=9
6.7
6
rid
ge
=9
7.4
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DO
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CA
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PR
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IN
AR
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F201
FR
A317
IM
PE
RM
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P
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EV
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PM
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ON
D G
RO
UN
D,
NO
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TOTA
L SI
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ha)
DEVE
LOPM
ENT
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(2.6
88ha
)
POST
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PMEN
T PE
RVIO
US
AREA
S - 3
.212
ha
POST
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ELO
PMEN
T IM
PERM
EABL
E AR
EAS
- 0.8
77ha
ROO
FTO
PS
DRIV
EWAY
S/RO
ADS
Hammond Ground, Read
Flood Risk Assessment and Drainage Management Strategy
FRA317-HAMMOND.GROUND_FRA&DMS
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