Question: Using the TR-55 method, the pre- and postdevelopment 100-year peak rates of runoff for a 20-acre site are calculated at 25 and 50 cfs, respectively.

Using the TR-55 method, the pre- and postdevelopment 100-year peak rates of runoff for a 20-acre site are calculated at 25 and 50 cfs, respectively. Estimate the required detention storage to regulate the 100-year discharge from the site to 80% of the predevelopment peak rate of runoff. The soil curve number for the proposed condition is calculated at CN = 80 and depth of the 100-year, 24-hour storm is 8.0 in. Use type III storm.

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