I’m a reviewing a hydraulic analysis of a 42” SD system (1,700LF long) that carries a constant flow of 150CFS. Instead of WSPG program the designer is using a manual formula of Culvert Flow Method/ Open Channel Hydraulics by Richard French. The entire system consists of 17 different sections with varying slopes and directions throughout. He analyzes each section individually as if it is a separate culvert instead of a continuous conduit. Any advice would be appreciated.
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