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Calculating the WQCV and Volume Reduction Chapter 3
Once the WQCV in watershed inches is found from Figure 3-2 or using Equation 3-1 and/or 3-2, the
required BMP storage volume in acre-feet can be calculated as follows:
Where:
V = WQCV A Equation 3-3
12
V
A
WQCV
= required storage volume (acre-ft)
= tributary catchment area upstream (acres)
= Water Quality Capture Volume (watershed inches)
Figure 3-2. Water Quality Capture Volume (WQCV) Based on BMP Drain Time
3-6 Urban Drainage and Flood Control District August 2011
Urban Storm Drainage Criteria Manual Volume 3