Water flows in a rectangular channel of width b = 20 ft at a rate of 100 ft3/s. The flowrate is to be measured by using either a rectangular weir of height Pw = 4 ft or a triangular (θ = 90°) sharp-crested weir. Determine the head, H, necessary for each weir. If measurement of the head is accurate to only +-0.04 ft, determine the accuracy of the measured flowrate expected for each of the weirs. Which weir would be more accurate? Explain.
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