BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

4.1.1.1 PERVIOUS PAVEMENTAlternative Names: Permeable Pavement, Porous Concrete, Porous PaversDESCRIPTIONPervious pavement is any system comprised of a load bearing surface thatallows for movement of water through the load bearing surface into anunderlying storage layer that can infiltrate or attenuate stormwater runoff.Pervious pavements are most applicable to locations with light vehicle loading.The load bearing surface can be made of porous concrete, or unit pavers or turfblocks separated by spaces and joints, through which water can drain. Perviouspavement decreases the effective impervious area of an urbanized site, therebyreducing runoff and pollutant loads leaving the site. Pervious asphalt is nolonger considered a pervious pavement in the Lake Tahoe Region due torepeated failure of pilot project testing.BMP DESIGN APPROACHPollutant Source ControlHydrologic SourceControlStormwater TreatmentSCALE OF APPLICATIONAll SFR and MFR < 1acreMFR 1-5 Acre and CICU< 5 acresMFR and CICU > 5acres and all WQIPsTYPE OF APPLICATIONTemporaryPermanentAPPLICABILITY• Not appropriate for soils with Ksat rates less than 1”/hr or areas withseasonally high groundwater (e.g., SEZ) where groundwater contaminationand connection to surface drainage systems are concerns.• Appropriate for locations with low traffic volumes and light vehicle loads.• Most appropriate for areas that are relatively flat (generally less than a 5percent slope).• Not appropriate where sediment-laden runoff could clog the surface layer.For example, pervious pavement shall not be designed to receive runoffTRPA BMP HandbookCHAPTER 4: BMP Toolkit2012 4.1.1.1-Pervious PavementPage 1