A commercial development covers an area of 10 ha (24.7 ac). Determine the size of a first flush treatment unit designed to capture and treat the first 12.7 mm (0.5 in.) of runoff. Determine the dimensions of the unit if the maximum depth is 3.5 m (11.4 ft) and the L/W ratio is approximately 5. Allow 0.50 m (1.6 ft) for dead storage.
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