Question: A weir is being considered for flow measurement in a long, concrete irrigation canal with a bottom slope of 0.002. The maximum depth of flow

A weir is being considered for flow measurement in a long, concrete irrigation canal with a bottom slope of 0.002. The maximum depth of flow in the 15-ft-wide canal is 6 feet, but the channel contains an additional 4 feet of freeboard. Determine the maximum height of a flow-measurement weir before the backwater exceeds the freeboard, assuming the weir is frictionless.

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