DMC reviews all available historical drainage data, including existing designs, reports and studies to determine regional drainage issues, which may affect designs. Hydrology calculations will be performed per applicable Stormwater Management Manual and Drainage Authority requirements.
For determination of peak stormwater discharges in smaller drainage areas, the Rational Method is generally used. For larger basins, TR-55 methodology is normally used. Hydrology calculations are usually submitted to the appropriate agency for review.