Investigation of sharp-crested weir discharge coefficient in the lateral intake located at curve channel

Lateral intakes are hydraulic structures, which are used for flow diversion from river. Due to the fact that most of rivers are curved on their path and due to existence of secondary flow, the outer bank of the bend is suitable places for positioning the lateral intake. The sill structure at the entrance of lateral intake is often used for controlling the flow and sediment entry to intake. The present experimental study focuses on the investigation of side-weir discharge coefficient in the entrance of lateral intake at different positions of a 180 degree channel bend. Also the relations were presented for estimation of discharge coefficient in various positions of lateral intake. The result showed that by increasing the froude number and proportion of sill height to upstream flow depth, the discharge coefficient decreases. Also positioning of side weir on 90o and 150o lead to maximum value of discharge coefficient and positioning of side weir on 135o lead to minimum value of discharge coefficient.