EFFECT OF UPSTREAM SIDE SLOPE OF CRUMP WEIR ON DISCHARGE COEFFICIENT

Hayder Abbas Al-Yousefi; Ali Abbas Kadhem; Layth Abdul Rasool ALASADI

doi:10.30572/2018/KJE/150404

Authors

Hayder Abbas Al-Yousefi Chemical Engineering Department, Faculty of Engineering, University of Kufa, Iraq
Ali Abbas Kadhem Chemical Engineering Department, Faculty of Engineering, University of Kufa, Iraq
Layth Abdul Rasool ALASADI Department of Structures and Water Resources, Faculty of Engineering, University of Kufa, Iraq

DOI:

https://doi.org/10.30572/2018/KJE/150404

Keywords:

Crump weir;, Upstream side slope;, Discharge Coefficient;, Free flow conditions;, Laboratory test;

Abstract

The current study examines the flow characteristics under free flow conditions over a crump weir. The impact of the side slopes of the weir on the coefficient of discharge (Cd) is taken into account. Four physical models with crest heights of 0.15 m under free flow circumstances and four upstream side slope (1:3, 1:2.5, 1:2 and 1:1.5) were used to investigate the impact of various variables on discharge coefficient (Cd). Using the dimensional analysis technique, the elements influencing the crump weir's discharge coefficient were determined based on laboratory tests. For the same flow rate, Cd value decrease by decreasing upstream side slope. It notices that a decrease in upstream slope (from 1:3 to 1:2.5) reducing Cd value about (2.61 %), decrease upstream slope from (1:3 to 1:2) reducing Cd value about (4.16 %) and when decrease upstream slope from (1:3 to 1:1.5) reducing Cd value about (5.81 %).

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