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A PROPOSAL FOR A PROPOSAL FOR COMPREHENSIVE EROSION COMPREHENSIVE EROSION CONTROL AND CONTROL AND CONTROL AND CONTROL AND GULLY EROSION GULLY EROSION MITIGATION PROGRAM FOR MITIGATION PROGRAM FOR MITIGATION PROGRAM FOR MITIGATION PROGRAM FOR IMO STATE IMO STATE IMO STATE IMO STATE

Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

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Page 1: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

A PROPOSAL FOR A PROPOSAL FOR COMPREHENSIVE EROSION COMPREHENSIVE EROSION

CONTROL ANDCONTROL ANDCONTROL ANDCONTROL ANDGULLY EROSION GULLY EROSION

MITIGATION PROGRAM FORMITIGATION PROGRAM FORMITIGATION PROGRAM FOR MITIGATION PROGRAM FOR

IMO STATEIMO STATEIMO STATEIMO STATE

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Develop Program GoalsDevelop Program GoalsDevelop Program GoalsDevelop Program Goals

Goal #1Goal #1-- Develop a comprehensive erosionDevelop a comprehensive erosionGoal #1Goal #1 Develop a comprehensive erosion Develop a comprehensive erosion control and gully erosion mitigation program for control and gully erosion mitigation program for the Government of Imo State Nigeria inthe Government of Imo State Nigeria inthe Government of Imo State, Nigeria in the Government of Imo State, Nigeria in conformance with State program goals. conformance with State program goals.

The main objective is to promote “Best The main objective is to promote “Best M P i ” h ill i iM P i ” h ill i iManagement Practices” that will mitigate current Management Practices” that will mitigate current problems while preventing future erosion problems while preventing future erosion

bl i I Sbl i I Sproblems in Imo State.problems in Imo State.

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OJIINTL/CALIFCO OJIINTL/CALIFCO UTILITIES JOINT VENTUREUTILITIES JOINT VENTURE

TheThe OJIOJI International/International/CalifcoCalifco TeamTeam andand ourourJJ //technicaltechnical partnerspartners havehave assembledassembled aa multimulti--disciplinarydisciplinaryteamteam ofof specialistspecialist inin thethe CivilCivil Engineering,Engineering, HydrologyHydrologypp g g,g g, y gyy gyandand HydrogeologicalHydrogeological Engineering,Engineering, EnvironmentalEnvironmentalEngineeringEngineering && Planning,Planning, EnvironmentalEnvironmentalg gg g g,g,ManagementManagement andand LandscapeLandscape ArchitectureArchitecture sectorsector totodevelopdevelop aa comprehensivecomprehensive erosionerosion controlcontrol andand gullygullypp pp g yg yerosionerosion mitigationmitigation forfor thethe GovernmentGovernment ofof ImoImo State,State,NigeriaNigeria inin conformanceconformance withwith thethe policypolicy andandgg p yp yprogrammaticprogrammatic directiondirection ofof youryour MinistryMinistry..

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PROJECT PRINCIPAL PROJECT PRINCIPAL TEAM LEADERTEAM LEADER

Engineer AugustusEngineer Augustus AjawaraAjawara our assigned Projectour assigned ProjectEngineer Augustus Engineer Augustus AjawaraAjawara our assigned Project our assigned Project Principal has over twentyPrincipal has over twenty--five years of professional five years of professional civil engineering experience providing capitalcivil engineering experience providing capitalcivil engineering experience, providing capital civil engineering experience, providing capital improvement programs management and improvement programs management and infrastructure development for clients includinginfrastructure development for clients includinginfrastructure development for clients, including infrastructure development for clients, including the State of California, Los Angeles County Public the State of California, Los Angeles County Public Works Department Riverside TransportationWorks Department Riverside TransportationWorks Department, Riverside Transportation Works Department, Riverside Transportation Agency, City of Compton and other local Agency, City of Compton and other local government agencies in California and Texas Hisgovernment agencies in California and Texas Hisgovernment agencies in California and Texas. His government agencies in California and Texas. His public sector experience included serving as public sector experience included serving as Director of Planning for Riverside Transit AgencyDirector of Planning for Riverside Transit Agency

Page 5: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

PROJECT PRINCIPALPROJECT PRINCIPALJJEngineer Engineer AjawaraAjawara also served as Director of also served as Director of M i ip l S r i D p rtm t f r th Cit fM i ip l S r i D p rtm t f r th Cit fMunicipal Services Departments for the City of Municipal Services Departments for the City of Compton. As Director of Municipal Services for Compton. As Director of Municipal Services for th Cit f C mpt n h s r sp nsibl f r thth Cit f C mpt n h s r sp nsibl f r ththe City of Compton, he was responsible for the the City of Compton, he was responsible for the management of six divisions, including, the Public management of six divisions, including, the Public Works/Engineering Di ision Transportation andWorks/Engineering Di ision Transportation andWorks/Engineering Division, Transportation and Works/Engineering Division, Transportation and Capital Improvement Programs Division, Capital Improvement Programs Division, M nicipal Water Reso rces Division GeneralM nicipal Water Reso rces Division GeneralMunicipal Water Resources Division, General Municipal Water Resources Division, General Services Division, Facilities Management, Solid Services Division, Facilities Management, Solid Waste Management Division and the InfrastructureWaste Management Division and the InfrastructureWaste Management Division and the Infrastructure Waste Management Division and the Infrastructure Construction and Maintenance Services Division. Construction and Maintenance Services Division.

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Develop Program GoalsDevelop Program Goals

Goal #2: Provide Immediate MitigationGoal #2: Provide Immediate MitigationGoal #2: Provide Immediate Mitigation Goal #2: Provide Immediate Mitigation Measures for Gully Erosion and Ecologically Measures for Gully Erosion and Ecologically damaged sites that have been identified in Imodamaged sites that have been identified in Imodamaged sites that have been identified in Imo damaged sites that have been identified in Imo State through construction of new culverts, and State through construction of new culverts, and reconstruction of damaged and collapsedreconstruction of damaged and collapsedreconstruction of damaged and collapsed reconstruction of damaged and collapsed Culverts, filling gullies with lateritic materials, Culverts, filling gullies with lateritic materials, construction of diversion roadwaysconstruction of diversion roadwaysconstruction of diversion roadways, construction of diversion roadways, reconstruction and paving of roadways with new reconstruction and paving of roadways with new and improved roadway culvertsand improved roadway culvertsand improved roadway culverts.and improved roadway culverts.

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Problem Definition, Gully Problem Definition, Gully Erosion in Eastern NigeriaErosion in Eastern Nigeria

SouthSouth--eastern Nigeria is a denselyeastern Nigeria is a densely--forestedforestedSouthSouth eastern Nigeria is a denselyeastern Nigeria is a densely forested forested region including rolling, hilly terrain. But this region including rolling, hilly terrain. But this lush green land could soon become an aridlush green land could soon become an aridlush, green land could soon become an arid lush, green land could soon become an arid badland that's [unsuitable] for cultivation, badland that's [unsuitable] for cultivation, dangerous for human habitation and well on thedangerous for human habitation and well on thedangerous for human habitation, and well on the dangerous for human habitation, and well on the way to becoming a parcel of useless land, warns way to becoming a parcel of useless land, warns Frank SimpsonFrank Simpson aa sedimentologistsedimentologist at theat theFrank SimpsonFrank Simpson, a , a sedimentologistsedimentologist at the at the University of WindsorUniversity of Windsor. The culprit for this . The culprit for this problem is gully erosionproblem is gully erosionproblem is gully erosion. problem is gully erosion.

Page 8: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

Gully ErosionGully ErosionGully ErosionGully Erosion

Gully Erosion occursGully Erosion occurs Gully erosion takes placeGully erosion takes placeGully Erosion occurs Gully Erosion occurs due to:due to:DeforestationDeforestation

Gully erosion takes place Gully erosion takes place when wearwhen wear--andand--tear on tear on the surface land causes the surface land causes DeforestationDeforestation

Unsustainable Farming Unsustainable Farming PracticesPractices

rainwater to accumulate rainwater to accumulate in one area, causing loss in one area, causing loss PracticesPractices

Path and Road Path and Road ConstructionConstruction

of vegetation cover, of vegetation cover, localized erosion, and the localized erosion, and the formation of g lliesformation of g llies

Poorly Constructed Poorly Constructed Drainage systemsDrainage systems

formation of gulliesformation of gulliesFlood Debris that Flood Debris that overwhelm existingoverwhelm existingg yg y overwhelm existing overwhelm existing structures structures

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Gully ErosionGully ErosionGully ErosionGully Erosion

Gully Erosion problem grows as interconnecting systems of Gully Erosion problem grows as interconnecting systems of y p g g yy p g g ygullies spread across the land surface. The resulting rungullies spread across the land surface. The resulting run--off from off from the hillsides often pollutes the water supply, while landslides the hillsides often pollutes the water supply, while landslides threaten villages and highway travelersthreaten villages and highway travelersthreaten villages and highway travelers. threaten villages and highway travelers. A number of gullies in southeastern Nigeria are caused by the A number of gullies in southeastern Nigeria are caused by the overflow of concrete rainwater gutters at the side of highways, overflow of concrete rainwater gutters at the side of highways, leading to erosion leading to erosion —— particularly at the point where the gutter particularly at the point where the gutter and the road meet and the road meet —— that destabilizes hillsides and undermines that destabilizes hillsides and undermines roadbedsroadbedsroadbeds.roadbeds.Other gullies result from flood debris that overwhelm undersized Other gullies result from flood debris that overwhelm undersized and/or blocked culverts from lack of maintenance.and/or blocked culverts from lack of maintenance.

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G ll E iG ll E iGully Erosion Gully Erosion from Flood Debrisfrom Flood Debrisfrom Flood Debrisfrom Flood Debris

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Gully Erosion from Flood DebrisGully Erosion from Flood Debrisnd Bl k d C l rtnd Bl k d C l rtand Blocked Culvertsand Blocked Culverts

GullyGully ErosionErosion sometimesometime occursoccurs whenwhen roadsroads arearei li l d dd d bb d b id b i fl dfl d d id i ddextensivelyextensively damageddamaged byby debrisdebris floodflood depositsdeposits andand

sectionssections ofof saturatedsaturated roadroad edgeedge fillsfills collapses,collapses,i lli ll dd hh h ih i ii b db d ii ff hh ddespeciallyespecially aroundaround thethe hairhair--pinpin bendbend sectionsection ofof thethe roadroad

showingshowing typicaltypical RoadRoad GullyGullyonon hillyhilly roadsroads..GroundGround observationsobservations atat suchsuch sitessites showsshows thatthat manymany ofofyythethe culvertsculverts carryingcarrying veryvery smallsmall sideside streamsstreams werewereunableunable toto copecope withwith thethe veryvery highhigh floodflood flowsflows partlypartlypp yy gg p yp ybecausebecause ofof thethe largelarge volumevolume ofof water,water, butbut mainlymainlybecausebecause theythey werewere blockedblocked withwith gravelgravel..

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ROADSIDE GULLIESROADSIDE GULLIESROADSIDE GULLIESROADSIDE GULLIES

AA numbernumber ofof gulliesgullies inin southeasternsoutheastern NigeriaNigeriaAA numbernumber ofof gulliesgullies inin southeasternsoutheastern Nigeria,Nigeria,includingincluding ImoImo statestate werewere causedcaused byby thethe overflowoverflowofof concreteconcrete rainwaterrainwater guttersgutters atat thethe sideside ofofofof concreteconcrete rainwaterrainwater guttersgutters atat thethe sideside ofofhighways,highways, leadingleading toto erosionerosion —— particularlyparticularly atatthethe pointpoint wherewhere thethe guttergutter andand thethe roadroad meetmeetthethe pointpoint wherewhere thethe guttergutter andand thethe roadroad meetmeet..ThisThis destabilizesdestabilizes hillsideshillsides andand underminesunderminesroadbedsroadbeds WhenWhen thesethese areare uncheckedunchecked thetheroadbedsroadbeds.. WhenWhen thesethese areare unchecked,unchecked, thetheresultantresultant gullygully mostmost ofof thethe timetime underunder--scoursscoursandand cutscuts thethe entireentire roadroad bedbedandand cutscuts thethe entireentire roadroad bedbed..

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Page 14: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

Protective MeasuresProtective MeasuresProtective MeasuresProtective Measures

Construction of hydraulic regulation works that integrate aConstruction of hydraulic regulation works that integrate aConstruction of hydraulic regulation works that integrate a Construction of hydraulic regulation works that integrate a drainage network with storage ponds to cut off flood crest drainage network with storage ponds to cut off flood crest and lower hydraulic loads of interceptor canalsand lower hydraulic loads of interceptor canalsand lower hydraulic loads of interceptor canals.and lower hydraulic loads of interceptor canals.

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Temporary MeasuresTemporary MeasuresTemporary MeasuresTemporary Measures

Ditch checksDitch checks Sediment TrapSediment TrapSilt ChecksSilt ChecksStraw BalesStraw Bales

ppSediment RemovalSediment RemovalRoad ClosureRoad Closure

Temporary BermsTemporary BermsTemporary Slope DrainsTemporary Slope Drains

Temp PipeTemp PipeTemp Sediment BasinTemp Sediment Basin

Temporary Seeding and Temporary Seeding and MulchingMulching

Surface RougheningSurface Roughening

Mulching and CrimpingMulching and CrimpingBrush PilesBrush Piles

Page 16: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

Permanent MeasuresPermanent MeasuresPermanent MeasuresPermanent Measures

Sediment BasinsSediment BasinsSediment BasinsSediment BasinsRock DamsRock DamsType C Type C BermsBermsPermanent DiversionsPermanent DiversionsPermanent DiversionsPermanent DiversionsCulverts /BafflesCulverts /BafflesEnergy Energy DissipatorsDissipatorsDetention PondsDetention PondsDetention PondsDetention Ponds

Page 17: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

Temporary MeasuresTemporary MeasuresTemporary MeasuresTemporary Measures

Page 18: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

Temporary Slope DrainsTemporary Slope DrainsTemporary Slope DrainsTemporary Slope Drains

A temporary slope drainA temporary slope drainA temporary slope drain A temporary slope drain is a flexible or rigid is a flexible or rigid conduit used to conduit used to effectively transport effectively transport runoff down disturbed runoff down disturbed llslopes slopes

Page 19: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

Temporary Ditch and Inlet ChecksTemporary Ditch and Inlet ChecksTemporary Ditch and Inlet ChecksTemporary Ditch and Inlet Checks

A ditch check is a small,A ditch check is a small,A ditch check is a small, A ditch check is a small, temporary obstruction in temporary obstruction in a ditch or waterway used a ditch or waterway used to prevent erosion by to prevent erosion by reducing the velocity of reducing the velocity of fl Di h h kfl Di h h kflow. Ditch checks are flow. Ditch checks are used to reduce runoff used to reduce runoff velocity and to containvelocity and to containvelocity and to contain velocity and to contain sediment on the sediment on the construction site. construction site.

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Sediment BasinSediment BasinSediment BasinSediment Basin

A sediment basin is anA sediment basin is anA sediment basin is an A sediment basin is an effective temporary effective temporary impoundment that is impoundment that is used to detain runoff used to detain runoff from disturbed drainage from disturbed drainage

h dih diareas so that sediment areas so that sediment can settle before it is can settle before it is releasedreleasedreleased released

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Temporary Seeding and MulchingTemporary Seeding and MulchingTemporary Seeding and MulchingTemporary Seeding and Mulching

This work shall consist of This work shall consist of preparing and fertilizing a preparing and fertilizing a seedbed, furnishing and seedbed, furnishing and sowing of seed andsowing of seed andsowing of seed, and sowing of seed, and mulching. The purpose of mulching. The purpose of temporary seeding and temporary seeding and mulching is to produce a mulching is to produce a quick ground cover to reduce quick ground cover to reduce erosion in disturbed areas erosion in disturbed areas that are expected to be that are expected to be redisturbed at a later date. redisturbed at a later date.

Page 22: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

Silt FenceSilt FenceSilt FenceSilt Fence

Silt fence is a temporarySilt fence is a temporarySilt fence is a temporary Silt fence is a temporary barrier used to filter barrier used to filter sediment from sheet sediment from sheet flow and decrease flow and decrease velocity of the runoff. velocity of the runoff.

Page 23: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

Temporary PipeTemporary PipeTemporary PipeTemporary Pipe

Temporary pipes areTemporary pipes areTemporary pipes are Temporary pipes are used to carry water under used to carry water under a road that handles a road that handles traffic, such as a haul traffic, such as a haul road or temporary road or temporary

Th i iTh i icrossover. The pipe is crossover. The pipe is sized based on a twosized based on a two--year stormyear stormyear storm. year storm.

Page 24: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

Temporary Erosion Control BlanketsTemporary Erosion Control BlanketsTemporary Erosion Control BlanketsTemporary Erosion Control Blankets

Erosion control blanketsErosion control blanketsErosion control blankets Erosion control blankets and plastic netting are and plastic netting are used to prevent erosion used to prevent erosion of seeded areas for a of seeded areas for a period of time sufficient period of time sufficient f h d df h d dfor the seed to produce a for the seed to produce a root system capable of root system capable of providing permanentproviding permanentproviding permanent providing permanent erosion protection. erosion protection.

Page 25: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

Use of Erosion Control BlanketsUse of Erosion Control BlanketsUse of Erosion Control BlanketsUse of Erosion Control Blankets

Fill slopes greater than 10 Fill slopes greater than 10 feet high feet high Ditch slopes greater than 10 Ditch slopes greater than 10 percent percent Highly erodible soils Highly erodible soils Fluctuating water levels Fluctuating water levels High ditch flows High ditch flows H g d tc owsH g d tc owsHigh sheet flow High sheet flow Standard seeding and Standard seeding and mulching will not withstandmulching will not withstandmulching will not withstand mulching will not withstand anticipated runoff anticipated runoff Around high quality water Around high quality water bodies.bodies.bodies. bodies.

Page 26: Erosion Control Presentation[2].ppt - WIEF2].pdf · GullyGully Erosion Erosion sometimesometime occursoccurs whenwhen roadsroads areare extensilively dddamaged bby dbidebris fl dflood

Temporary Stream CrossingTemporary Stream CrossingTemporary Stream CrossingTemporary Stream Crossing

Temporary stream crossing are provided to facilitate movementTemporary stream crossing are provided to facilitate movementTemporary stream crossing are provided to facilitate movement Temporary stream crossing are provided to facilitate movement of contractor’s equipment across streams in compliance with of contractor’s equipment across streams in compliance with Corps of Engineer requirements. The crossing is to be Corps of Engineer requirements. The crossing is to be constructed such that minimal impact is subjected to the streamconstructed such that minimal impact is subjected to the streamconstructed such that minimal impact is subjected to the stream constructed such that minimal impact is subjected to the stream and aquatic life. and aquatic life.

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Contractor’s Erosion Control PlanContractor’s Erosion Control PlanContractor s Erosion Control PlanContractor s Erosion Control Plan

To ensure that contractors use Best Management To ensure that contractors use Best Management ggPractices, Contractors must prepare, submit and receive Practices, Contractors must prepare, submit and receive approval for Erosion Control Plans.approval for Erosion Control Plans.The contractor must ensure that soil erosion isThe contractor must ensure that soil erosion isThe contractor must ensure that soil erosion is The contractor must ensure that soil erosion is minimized and eroded soil does not leave the minimized and eroded soil does not leave the construction project into streams or onto adjacent construction project into streams or onto adjacent propertypropertyproperty property Timely installation of silt control devices, such as silt Timely installation of silt control devices, such as silt fence and ditch checks, will help to prevent this damage fence and ditch checks, will help to prevent this damage f if ifrom occurring. from occurring. Items to be used:Items to be used:Location and timing of silt fence and silt basins andLocation and timing of silt fence and silt basins andLocation and timing of silt fence and silt basins and Location and timing of silt fence and silt basins and other temporary erosion control measures other temporary erosion control measures Schedule for seeding Schedule for seeding

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Best Management Best Management ggPracticesPractices

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Ditch ErosionDitch ErosionDitch ErosionDitch Erosion

Ditch erosion is controlled by widening ditchesDitch erosion is controlled by widening ditchesDitch erosion is controlled by widening ditches, Ditch erosion is controlled by widening ditches, flattening ditch grades, or by application of flattening ditch grades, or by application of proper ditch protection such as mulch soddingproper ditch protection such as mulch soddingproper ditch protection such as mulch, sodding, proper ditch protection such as mulch, sodding, ditch checks, erosion control blanket, rock ditch ditch checks, erosion control blanket, rock ditch liner and paved ditchesliner and paved ditchesliner and paved ditches. liner and paved ditches.

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Silt FencesSilt FencesSilt FencesSilt Fences

Silt fencesSilt fences should beshould beSilt fencesSilt fences should be should be placed around culvert placed around culvert ends to prevent sediment ends to prevent sediment from entering the from entering the drainage ditch. drainage ditch.

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Borrow Areas or Rock DamsBorrow Areas or Rock DamsBorrow Areas or Rock DamsBorrow Areas or Rock Dams

A A Type II ditch checkType II ditch check or or ypypType C BermType C Berm along the along the low side of the borrow low side of the borrow r ld mi imiz thr ld mi imiz tharea could minimize the area could minimize the

potential of the silt potential of the silt leaving the site. leaving the site. ggA rock dam is an A rock dam is an oversized Type II rock oversized Type II rock di h h k hdi h h k hditch check that serves to ditch check that serves to impound water and impound water and sediment. sediment.

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Type C BermsType C BermsType C BermsType C Berms

Type C berms areType C berms areType C berms are Type C berms are specified at the toes of specified at the toes of spill slopes around spill slopes around bridge construction bridge construction operations and will be operations and will be

d hd hconstructed to the constructed to the specified dimension specified dimension

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SlopesSlopesSlopesSlopes

Erosion of slopes isErosion of slopes isErosion of slopes is Erosion of slopes is controlled by use of controlled by use of interception ditches and interception ditches and by application of proper by application of proper slope protection slope protection

hhmeasures such as measures such as fertilizing, mulching, fertilizing, mulching, seeding blankets orseeding blankets orseeding, blankets or seeding, blankets or sodding. sodding.

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Interception of Ditches and LeveesInterception of Ditches and LeveesInterception of Ditches and LeveesInterception of Ditches and Levees

Interception levees andInterception levees andInterception levees and Interception levees and ditches should be ditches should be installed at the top of installed at the top of backslopes to prevent backslopes to prevent gullies from forming on gullies from forming on hhthe cuts. the cuts.

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Permanent DiversionsPermanent DiversionsPermanent DiversionsPermanent Diversions

On large, steep backOn large, steep backOn large, steep back On large, steep back slopes permanent slopes permanent diversion berms or diversion berms or terraces are used terraces are used transverse to grade to transverse to grade to di ff bili ddi ff bili ddivert runoff to stabilized divert runoff to stabilized slope drains. slope drains.

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Sediment BasinsSediment BasinsSediment BasinsSediment Basins

A sediment basin is aA sediment basin is aA sediment basin is a A sediment basin is a water storage area with water storage area with rock riprap placed in rock riprap placed in inlet and outlet areas inlet and outlet areas with defined side slopes with defined side slopes

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Maintenance During ConstructionMaintenance During ConstructionMaintenance During ConstructionMaintenance During Construction

Inspection personnel assigned to erosion controlInspection personnel assigned to erosion controlInspection personnel assigned to erosion control Inspection personnel assigned to erosion control work should review project plans, specifications, work should review project plans, specifications, special provisions and road standards pertainingspecial provisions and road standards pertainingspecial provisions, and road standards pertaining special provisions, and road standards pertaining to erosion control. to erosion control.

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Permanent Erosion Control Permanent Erosion Control MeasuresMeasures

Permanent erosion control measures arePermanent erosion control measures arePermanent erosion control measures are Permanent erosion control measures are installed to reduce maintenance costs and to installed to reduce maintenance costs and to improve appearanceimprove appearanceimprove appearance. improve appearance.

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Culverts with EnergyCulverts with Energy DissipatorsDissipators

gB – Basin Width (inside)C – Basin HeightD – Sill Height (inside)E – Headwall HeightF – Headwall Length Culverts with Energy Culverts with Energy DissipatorsDissipators

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Installation of Culverts with Installation of Culverts with Energy Energy DissipatorsDissipators

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ENGINEERING DESIGN ENGINEERING DESIGN DRAWING FOR A CULVERTDRAWING FOR A CULVERT

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Installation of Culvert with Installation of Culvert with Energy Energy DissipatorsDissipators

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Rock DamsRock Dams

A rock dam is an oversized Type II rock ditch check A rock dam is an oversized Type II rock ditch check that serves to impound water and sediment. that serves to impound water and sediment. It is usually is installed down grade from a culvert It is usually is installed down grade from a culvert outlet or at locations where drainages exit Road outlet or at locations where drainages exit Road right of way. The size (length and height) of the right of way. The size (length and height) of the rock dam depends on the volume of water that rock dam depends on the volume of water that flows through the drainage structure, and the width flows through the drainage structure, and the width of the drainage channel. Rock dams are not of the drainage channel. Rock dams are not appropriate where impounded sediment and gravel appropriate where impounded sediment and gravel could accumulate inside of the culvert. Also, rock could accumulate inside of the culvert. Also, rock dams are not appropriate in streams that are dams are not appropriate in streams that are regulated by the US Army Corps of Engineers regulated by the US Army Corps of Engineers

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ENGINEERING DESIGN ENGINEERING DESIGN DRAWING FOR A CULVERTDRAWING FOR A CULVERT

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THANK YOU NOTESTHANK YOU NOTESTHANK YOU NOTESTHANK YOU NOTES

THANK YOU FOR THETHANK YOU FOR THETHANK YOU FOR THE THANK YOU FOR THE OPPORTUNITY. WE LOOK OPPORTUNITY. WE LOOK FORWARD TO WORKING FORWARD TO WORKING WITH YOUR AGENCYWITH YOUR AGENCYWITH YOUR AGENCYWITH YOUR AGENCY