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Calculate Required Retention/Detention Pond Storage Volume by Triangle Hydrograph Method:

(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)
Peak outflow rate out of the basin (Qo - cfs or cms)
Duration of basin inflow (ti - s)
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Vs =

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