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BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

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Pervious concrete parking pad located at the <strong>Tahoe</strong> Regional Planning Agency.3.5.4 STORMWATER COLLECTION AND CONVEYANCECollection and conveyance techniques are commonly necessary to capturerunoff from impervious areas and direct it to treatment and infiltration <strong>BMP</strong>s.Pretreatment <strong>BMP</strong>s (Refer to Chapter 4, Section 4.4 Stormwater Treatment)are needed at the end of all conveyance systems prior to infiltration <strong>BMP</strong>s topromote longevity, ease of maintenance, and to protect soil and groundwaterresources from pollutant loads in stormwater.Online <strong>BMP</strong> systems are designed to receive and safely convey an entire stormevent, but only treat up to a specified design storm. Offline <strong>BMP</strong> systems aredesigned to receive only a specified flow rate or volume through a flowregulator (diversion structure, flow splitter, etc.). The advantage of an offlinesystem is that there is less chance that previously captured sediment and otherpollutants in the <strong>BMP</strong> will not be suspended during higher flows movingthrough a system as may happen in an online system.TRPA <strong>BMP</strong> HandbookCHAPTER 3: Permanent <strong>BMP</strong> Planning and Selection2012 Page 3-23

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