HYDRAULIC DESIGN OF 2-STAGE CHANNELS

Recent research has shown that conventional methods for the hydraulic design of two-stage channels are incorrect. The research results have been reviewed and interpreted in the context of practical design procedures. Flow may lie in one of several regions of performance, depending largely on the relative depths of flow on the flood plains and in the main channel, and a suite of functions has been derived for assessing overall conveyance. The research-based equations have been validated against available river gaugings. The new information has wide implications for open-channel hydraulics, river engineering and flood management.