ABSTRACT

Flow diversion is an important element in the operation of an off stream basin. In practice, flow diversion may be a simple overtopping side weir installed on top of a channel bank. The flow diversion system consists of a downstream culvert on the channel alignment and an upstream side weir on the top of a channel bank. To transfer flows between the flood channel and the off stream detention basin, a short conduit is installed on the basin floor. Preferably, this conduit is laid horizontally as an equalizer to balance the difference between the water stages. A sediment forebay is a small pool installed immediately downstream of the flow entrance of a detention basin. A micropool is a backup system in case that a clogging situation is developed around the outflow structure. The main purpose of a micropool is to warrant the drain time and flow release rate under the design condition.