Design a rain garden to retain the runoff from a 1200 ft2 residential dwelling roof during a

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Design a rain garden to retain the runoff from a 1200 ft2 residential dwelling roof during a New Jersey water quality storm that is 1.25 in. of rainfall in 2 hours. The rain garden includes a 6 in. depression and 1 ft thick soil medium over a 6 in. layer of sand.

Estimate porosity of the soil and sand at 0.2 and 0.35, respectively.

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