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Filtration Bioretention (F-5) Design Point: 1 Enter Site Data For Drainage Area to be Treated by Practice Contributing Impervious Percent Drainage Area WQv Precipitation Area Area Impervious Rv Description Number (cf) (in) (Acres) (Acres) % Filtration 3 0.65 0.22 33 0.35 829 1.00 Bioretention Design Criteria Enter underlying soil infiltration rate (based on 0 Underdrains required geotechnical testing, refer to Appendix D) Is the contributing area to the practice a No stormwater hotspot? Is the practice the first in series for treatment No of a Level 1 (Infiltration Restricted) hotspot? Is contributing area greater than max. No contributing area? Enter depth to seasonal high water table (ft) 6 Enter depth to bedrock (ft) 6 Is pretreatment provided, in conformance with Yes Section 6.4.3.1 Enter average height of ponding (ft) 0.5 Enter depth of surface layer (inches) 3 Enter depth of filter media (ft) 2.5 Enter depth of drainage layer (inches) 10 Enter slope of maintenance access (%) 1 Enter width of maintenance access (ft) 12 Sizing Criteria Value Units Notes Permeability Flow Rate k 1 ft/day Filter Time tf 2 days Required Filter Area Af 345 sf Enter Provided Filter Area Af 348 sf Recalculated Water Quality Volume (based on WQv calc 835.2 cf provided filter area) Calculate Runoff Reduction RRv Provided 334 cf This is the portion of the WQv that is not reduced in WQv Treated 495 cf the practice. Page 168 of 359