Stormwater Quality Design Manual (May 2007) - City of Sacramento ...

Runoff Treatment Control Measure Fact SheetWater Quality Detention BasinsTable DB-6. Design Data Summary Sheet for Water Quality Detention BasinDesigner:Company:Project:Location:Date:1. Design Water Quality Volumea. Tributary drainage areab. Water Quality VolumeArea =WQV =acreacre-ft2. Basin Depths and Water Surface Areasa. For Wet and Combination Basins:Permanent pool volume (Vol pp )Average depth of permanent pool (D avg ) (4-8 ft)Water surface area of permanent pool (A pp )Water surface elevation of permanent pool (WS Elev pp )b. ForebayDepth range = 2-4 ftVolume range = 5-10 % of WQVWater surface area rangeACTUAL DESIGNVol pp =acre-ftD avg =ftA pp = ft 2WS Elev pp =ftDepth =ftVolume =acre-ftWS Area = ft 24. Depth of WQV and Max WS Elevationa. Maximum water surface area with WQV (A WQV )c. Maximum water surface elevation with WQV (WS Elev WQV )A WQV = ft 2WS Elev WQV =ft5. For Wet and Combo Basins: Determine Maximum dry seasoninflow to maintain permanent pond in the dry season. Use table DB-2and an evaporation rate of 0.45 in/day for the Sacramento area.Q inflow = - Q E-P + Q seepageQ E-P =Q seepage =Q inflow =acre-ft/moacre-ft/moacre-ft/moStormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007DB-19