Effect of rounded-edge entrance on discharge coefficient of side weir in rectangular channels

John Wiley and Sons
Publication Type:
Journal Article
Irrigation and Drainage, 2009, 58 (4), pp. 482 - 491
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Side weirs are flow diversion devices that are widely used in irrigation and drainage networks and urban sewage systems. They are usually built with a squared-edge entrance. The present study focuses on the effect of rounded-edge entrance shape on the discharge coefficient of a side weir under subcritical flow condition in rectangular channels. In this study, 90 laboratory tests were conducted and the results were analyzed to find the influence of non-dimensional hydraulic parameters on the discharge coefficient. From the results, it was found that under subcritical flow condition the side weir with rounded-edge entrance discharges 10% more flow rate than the squared edge entrance. As a result, for equal flow rate, the rounded-edge entrance side weir with small dimensions can be designed for use in practical applications.
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