Explain with the help of specific energy diagram about two types of flows that are possible in a given channel at constant discharge. Also, comment on the flow condition when the specific energy is minimum.
(b) A rectangular channel 25 m wide has a bed slope of 1:1200 and ends in a free outfall. If the channel carries a flow rate of 20 m³/s, and has a Manning's roughness coefficient of 0.014, how far from the outlet is the depth equal to 99% of normal depth. Use four equal depth steps in the calculations?
