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How do I calculate the depth of the river if I have a trapezoidal cross section...

How do I calculate the depth of the river if I have a trapezoidal cross section with bottom width b = 10 meters, H:V = 2:1, Q = 655 m3/2, total height of trapezoidal is 8 meters, manning roughness coefficient: n = 0,025 on all sides, and river bed slope    i = 0.0007

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