Question: An engineer makes careful measurements with a weir (see Sect. 10.7 later) which monitors a rectangular unfinished concrete channel laid on a slope of 1.

An engineer makes careful measurements with a weir (see Sect. 10.7 later) which monitors a rectangular unfinished concrete channel laid on a slope of
1°. She finds, perhaps with surprise, that when the water depth doubles from
2 ft 2 inches to 4 ft 4 inches, the normal flow rate more than doubles, from 200 to 500 ft3/s.
(a) Is this plausible?
(b) If so, estimate the channel width.

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