Water is fl owing in a rectangular concrete channel. Apply the Manning equation to calculate the discharge. Th e channel is unfi nished concrete 8 ft wide and drops 3 ft over a run of 1000 ft ; the...

Water is fl owing in a rectangular concrete channel. Apply the Manning equation to calculate the discharge. Th e channel is unfi nished concrete 8 ft wide and drops 3 ft over a run of 1000 ft ; the depth of fl ow is 2.5 ft ; T = 60°F; and the fl ow is uniform. Choose the closest answer (cfs): (a) 114, (b) 145, (c) 183, (d) 212, or (e) 565.