A trapezoidal concrete channel (n = 0.015) has a bottom width of 6.10 m (20.0 ft), side slopes of 2H:1V, a discharge of 141.6 cms (5,000 cfs), and a longitudinal slope of 0.0001. The channel extends from an upstream reservoir 6,098 m (20,000 ft) to a downstream sluice gate. Use an entrance loss cotrance loss coefficient at the reservoir of where the channel invert elevation is 91.46 m (300.0 ft). If the sluice gate is closed in 600 seconds, compute the velocity and water depth along the channel after 1,200, 1,800, and 2,400 seconds.
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