| Summary: | The designed length of the rectangular side weirs sometimes becomes too long that makes it non-practical from the engineering point of view. In order to decrease the length of channel opening with the desired water height, this study focuses on applying trapezoidal geometry for side weirs. The discharge coefficient needs to be found experimentally for any kinds of trapezoidal side weirs. For this study experimental tests have been carried out for trapezoidal side weir in order to obtain the discharge coefficient. The main dimensionless variables for the tests include: Upstream end Froude number (F1), w/y1, L/B, L′/L, w/L′ and sin (α). Finally, the relationship for De-Marchi’s coefficient in subcritical flow for trapezoidal side weir is presented based on the non-dimensional parameters of weir and flow. Eventually, all the data points are within ±10% limit, which shows the accuracy of the results of this study.
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