Transcription of Equation List for Sizing Wet Ponds
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Equation List for Sizing Wet Ponds
Equation List for Sizing Wet Ponds Calculating the Water Quality Volume (Water Quality TM Section ) The water quality protection volume is calculated by multiplying the 85th percentile annual rainfall event by the volumetric runoff coefficient (Rv) and the site area. Rv is defined as: Rv = + (I) ( ). where: I = percent of impervious cover (%). For North Central Texas, the average 85th percentile annual rainfall event is inches. Therefore, WQv is calculated using the following formula: WQv = Rv A ( ). 12. where: WQv = water quality protection volume (acre-feet). Rv = volumetric runoff coefficient A = total drainage area (acres). Calculating the Forebay Volume (Site Development Controls TM Section ) The forebay is sized to contain inches per impervious acre of contributing drainage Calculating the Permanent Pool Volume (Site Development Controls TM Section ) Wet Pond: Size permanent pool volume to WQv Extended Detention Wet Pond: Size permanent pool volume to WQv.
Equation List for Sizing Wet Ponds Ia/P where: Ia = initial abstraction P = accumulated rainfall obtained from rainfall tables by county in the Hydrology TM Section
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