A trapezoidal channel with a side slope of 1 : 1 and a bed width of 3.0 m is comprised of two reaches with bed slopes of 0.0004 and 0.03, respectively. The channel has a Chezy rough ness coefficient of 55 (metric) and coveys a discharge of 12.0 /s. Determine the length of the gradually varied flow reach in th is channel.
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