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Published byRussell Jagger Modified about 1 year ago

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Open channels – uniform flow, and flow routing

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We can consider 4 cases of streamflow Flow does not change in time Flow changes in time Flow does not change in space Flow changes in space

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Flow does not change in time Flow changes in time Flow does not change in space Steady, Uniform flow – stream flow under some conditions – use Manning’s equation Unsteady gradually varied flow – stream flow under some conditions – use a routing method Flow changes in spaceSteady, Nonuniform flow - Flow over a waterfall/weir – use surface profile methods or Energy equation UnsteadyDam break, surges – use complex computer models

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Geometry of Uniform Flow

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Trapezoidal cross-section of Uniform Flow

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Circular cross-section of Uniform Flow

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Manning’s equation From Robert Manning, Irish engineer ( ) Empirical formula Dates from 1889

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Hydrogaphs and routing

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