Question: In a 10 ha residential development, the pre- and postdevelopment peak rates of runoff are calculated at 1 m3/s and 2 m3/s, respectively. Estimate the

In a 10 ha residential development, the pre- and postdevelopment peak rates of runoff are calculated at 1 m3/s and 2 m3/s, respectively. Estimate the required detention storage to attenuate the postdevelopment peak runoff to 80% of the predevelopment condition.

Use the rational method and assume Tc = 30 minutes for a postdevelopment hydrograph.

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