The Peak rate of runoff expected from the catchment area of a farm pond is 4 m\(^3\)s\(^{-1}\). Assuming no temporary storage, find the length of the surplus weir, if the depth of flow over the weir is not to exceed 0.75 m.
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For broad-crested conservation weir designs, always use the standard discharge coefficient \(C = 1.71\).
Converting the exponent \(H^{1.5}\) to \(H \cdot \sqrt{H}\) simplifies manual calculations during exams.