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 Calculating the Water Quality Volume (Water Quality TM Section 1.2) 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 …
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