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 ( ).
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 defined as: Rv = 0.05 + 0.009(I) (1.1) where:
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