Can anyone shed some light on the subject of detention pond volume necessary to reduce flow rates to pre-project levels? Of the many methods for determining the preliminary estimate of detention pond volume necessary to begin the pond design,I am most familiar with the SCS TR-55 Method which provides the estimated required detention volume based on curve numbers, rainfall, basin area, and initial abstraction. Is it possible to reduce post-project flows to existing condition levels without providing the estimated required detention pond volume? I have seen SCS (NRCS) Method HEC-1 runs for projects showing the peak flows reduced, while providing considerably less than the recommended SCS pond volume. Any suggestions or comments would be appreciated.
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