Experimental investigation of compound side weir with modeling using computational fluid dynamic

Side weirs, also known as lateral weirs, are flow diversion devices widely used in irrigation as a head regulator of distributary and escapes, land drainage, and urban sewage systems. The modeling of side weir is a sophisticated problem in the hydraulic engineering. The coefficient of discharge over side weirs were investigated by many of the researchers experimentally and theoretically. In this study, the coefficient of discharge over the two compound side weirs (Rectangular and Semi-Circle) were modeled by using Computational Fluid Dynamic (CFD) to describe the flow characteristics in subcritical flow conditions. (Flow-3D) program was used to determine the numerical uncertainty of the simulation results. The simulation results were compared with experimental observations, and good agreements were obtained between the both results.