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Abstract

Abstract
In this paper a hydraulic study on free flow under sluice gate have been carried out in a rectangular flume using six gate cases (vertical gate and inclined with angles (30,45,60)o with a horizon in flow direction and (30&45)o opposite it. Four gate opening (2,3,4,4.5) cm and five different upstream heads (18.9,21,24,26,28.9) cm, were used. The coefficient of discharge (Cd) have been evaluated and shown that the average value of this coefficient increases from (0.645) for vertical gate to (0.832) for inclined gate (60)o with flow direction, while it decreases to (0.576) for inclined gate (45)o opposite flow direction .
A general equation of free flow under vertical and inclined gates, with any angle and with flow or opposite it, was contrived with error percentage not exceed (12.32)%.