Critical Depth of Open-Channel Flow
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For a given value of specific energy, the critical depth gives the greatest discharge, or conversely, for a given discharge, the specific energy is a minimum for the critical depth.
For rectangular channels, the critical depth, dc ft (m), is given by
dc =[Q2/b2g]1/3
where
dc =critical depth, ft (m)
Q= quantity of flow or discharge, ft3/s (m3/s)
B= width of channel, ft (m)