Input
bioretention only
detention only
Results
Water Quality Volume WQV (m³)—
Required surface area (m²)—
Storage volume at h—
Estimated drain time (hr)—
Drain time within target?—
Method
WQV = P_wq · C · A_da / 1000 (m³). Bioretention: A_BMP = WQV / (h_pond + k·t/1000), where t is target drain time. Drain time = WQV / (k/1000 · A_BMP). Detention: A_BMP = A_factor · A_da typical; storage V = h · A_BMP.