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salconflu

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As a starting point I am trying to figure out how much pressure is behind the 70 acre lake and what the average velocity (ft/sec) would be across the 2.5 square ft opening without the benefit of a flow meter. Is there a mathematical relationship between the impounded water and the velocity at the outlet? If there is then I could figure out the discharge for different square openings in the outlet structure, ie: cfs = ft/sec* length*width of the opening...