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SCS Detention Volume Method:
*Referencing Chapter 8, FHWA Highway Hydrology this calculation is to be used for calculating the detention storage volume to keep the post development discharge at or below the target predevelopment discharge.
For Metric, all input units are converted for the calculation below then converted back for the output results. 
Pre-development peak rate of discharge (qpb - cfs or cms)
Post development peak rate of discharge (qpa - cfs or cms)
Enter the SCS Design Storm Rainfall Distribution
Drainage area (A - ac or ha)
Post development runoff (Qa - in or mm)

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Storage ratio, Rs =
Volume storage, Vs =

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