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Calculate Required Retention/Detention Pond Storage Volume by 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)
Volume of in-flow (post development storm) hydrograph (Vi - Ac-ft or m^3)
Volume of out-flow (pre-development storm) hydrograph (Vo - Ac-ft or m^3)
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Vs =

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