Abstract
Detention basins, which are designed to control peak discharge rates, appear to increase bed transport rates. The effect of designing detention basins for controlling bed-material loads, rather than peak discharge control, on both bed-material loads and discharge rates is evaluated. The results indicate that the proper sizing of outlet structures of detention basins can reduce channel degradation to normal levels, as well as control peak discharge rates. Detention basins also serve to reduce wash loads. A method is provided for sizing detention basin outlet structures so that the detention time is sufficient to attain a preselected trap efficiency. Data from two small watersheds with detention basins were used to derive the trap efficiency and detention time curves.
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