Arectangular river channel, 7 m wide, carries water at a depth of 1.4 m. the slope of the channel is 1/500. the channel has poor alignment and the bed is covered with stones such that a manning's n value of 0.06 is appropriate. calculate the flow rate in the channel and prove whether the flow is sub-critical or super- critical. [5 marks] (c) for a rectangular channel, determine the relationship between its width, w, and depth, d, that will result in the maximum discharge.

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.

The answer would be a