Coefficient of Discharge for Free Flow Sluice Gates

Abstract

This paper aims to investigate the effect of sill shape located under the sluice gate on the coefficient of discharge for free gate flow conditions. Both sill shape and sill height are studied. Shapes tested include both polygonal and non polygonal sills. Of the shapes tested, circular sill is the most effective shape, and triangular sill is the best among the polygonal sills. Besides the shape, sill height plays an important role on the coefficient of discharge. Using dimensional analysis and non linear regression analysis, an equation is developed to predict the coefficient of discharge for both silled and non silled free gate flows. The equation includes flow parameters, gate opening, sill height, and sill shape factors. The equation developed agrees well with the experimental results as well as published data of other investigators.