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VIRGINIA DCR STORMWATER DESIGN SPECIFICATION No. …
swbmpvwrrc.wp.prod.es.cloud.vt.eduUnderdrain: corrugated HDPE or equivalent, with a minimum 6-inch stone sump below the invert; OR: none, if soil infiltration requirements are met Clean-outs: not needed Inflow: sheetflow or roof leader Pretreatment: external (leaf screens, grass filter strip, energy dissipater, etc.).