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BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

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4.2.2.4 RIPRAPAlternative Names: Rock Slope ProtectionDESCRIPTIONRock riprap is the controlled placement of large angular rock (stone, cobbles,boulders) over soil to protect and stabilize the soil surface from erosion. Riprapis commonly used to stabilize over-steepened slopes. Riprap can also be used toprotect culvert inlets and outlets, stream banks, drainage channels (as a lining),or other areas subject to erosion by stormwater runoff.<strong>BMP</strong> DESIGN APPROACHPollutant SourceControlHydrologic SourceControlStormwater TreatmentSCALE OF APPLICATIONAll SFR and MFR < 1acreMFR 1-5 Acre andCICU < 5 acresMFR and CICU > 5acres and all WQIPs<strong>BMP</strong> TYPETemporaryPermanentAPPLICABILITY• Cut and fill slopes typically steeper than 3:1 (run to rise), or any sloped areaprone to erosion that may be difficult to revegetate.• Along stream banks or within drainage channels as a stable lining resistantto scour.• Within small drainage channels where infiltration is desirable but thepotential for scour is too great for application of vegetative stabilization orgeotextile linings.• In the shorezone, or other areas subject to wave action.• Energy dissipation for pipe outlets and inlets to prevent scour andundercutting.TRPA <strong>BMP</strong> HandbookChapter 4: <strong>BMP</strong> Toolkit2012 4.2.2.4-RiprapPage 1

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