Reducing detention volumes with improved outlet structure

B. P. Tullis, E. C. Olsen & K. Gardner
Detention basin outlet flow control structures typically include a weir, orifice, and/or culvert. One disadvantage of these types of control structures is that the flow rate continually varies with the water level in the detention basin. The corresponding outflow hydrographs for such control structures are typically bell shaped, with the maximum allowable peak flow duration lasting only a \342\200\234moment\342\200\235 at the point where the rising leg of the hydrograph transitions to the falling leg of...
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