Experimental investigation of the effect of perforated sill and orifice on sluice gate discharge coefficient

An experimental methodology was applied in this research to examine the outcomes of gate positioning and the performance of a sill with an orifice under sluice gates on the discharge coefficient. For this purpose, rectangular sills with the number of orifices one, two, three, and four under flow rate ranging from 150 to 750 liters per minute and the opening height of the gates 2 and 3 cm were investigated. The findings indicated that incorporating a sill with an orifice under the sluice gates enhanced the discharge coefficient by 37% compared to when the gate was absent. Increasing the number of orifices in the sill resulted in a 5 to 23% reduction in the discharge coefficient compared to the condition with no orifice. Finally, a prototype equation was developed to estimate the discharge coefficient (Cd) of the gate with a sill containing an orifice, demonstrating a high coefficient of determination and an acceptable root mean square error.