Question: A Weir is installed across a rectangular open channel thereby raising the floor depth from 1 . 5 m in a normal flow to 3

A Weir is installed across a rectangular open channel thereby raising the floor depth from 1.5m in a normal flow to 3m at the weir . The width of the channel is 10m and is laid at a slope of 1/10500. Find the approximate length of the back water curve considering the average velocity ,average depth ,average slope midway between the sections ,take mannings to be 0.02.

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