Abstract
An experimental investigation of the flow over trapezoidal broad-crested side weir in rectangular channels under subcritical flow conditions is reported. It was found that the discharge coefficient of a trapezoidal broad-crested side weir is related to the Froude number at the upstream of the weir, ratios of weir height to depth of flow, weir length to width of main channel and length of broad-crested weir to width of main channel for different side slopes. Additionally, a reliable equation for calculating the discharge coefficient of trapezoidal broad-crested side weirs is presented.
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