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Calculate Reduced Peak Discharge from a Known Retention/Detention Pond Storage Volume:

(Note: All input Metric units are converted to English units for the equations below and then the output English units are converted back to Metric)
Peak inflow rate into the basin (Qi - cfs or cms)
Storage volume of stormwater pond (Vs - Ac-ft or m^3)
Volume of runoff in the inflow hydrograph (Vr - Ac-ft or m^3)
Time base (duration) of inflow hydrograph (Ti - s)
Time to peak of inflow hydrograph (Tp - s)
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Qo =

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