A triangular channel with a side slope of 1 : 1 and a bed slope of 0.02 carries a discharge of 100  /s. A gate is located at the end of the channel at which the water depth is 7.0 ft. Determine the...

A triangular channel with a side slope of 1 : 1 and a bed slope of 0.02 carries a discharge of 100
 /s. A gate is located at the end of the channel at which the water depth is 7.0 ft. Determine the length of the rising curve before the gate. Take the Manning roughness coefficient as 0.02 and use the step-by-step method.