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BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

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4.2.2.3 RETAINING WALLAlternate Names: Rock Wall, Gravity Wall, Toe Wall, Gabion Wall, TimberWallDESCRIPTIONRetaining walls are structures placed at the toe of an over-steepened slope tostabilize the slope and reduce erosion. Retaining walls can provide a flatterslope above the retaining wall that can promote revegetation and can trapsediment dislodged upslope.<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• Slopes typically steeper than 2:1 (run to rise) that cannot be graded to amilder slope due to site constraints.• Located at the toe of a slope and used to create clearance between a slope andan adjacent roadway, driveway, or structure.Advantages• Prevents slope failures.• Reduces the erosion potential of runoff originating on the slope.• Can improve the condition of the slope above the retaining wall andpromote plant establishment.• By using natural materials, retaining walls can be aesthetically pleasing byblending into the natural landscape.TRPA <strong>BMP</strong> HandbookChapter 4: <strong>BMP</strong> Toolkit2012 4.2.2.3-Retaining WallPage 1

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