ANALYSIS OF FLOW THROUGH SIDE SLUICE GATE

Abstract

A side sluice gate is a flow-regulation device widely used in irrigation works for diverting the flow from a main channel into a secondary channel. It is a typical case of spatially varied flow with decreasing discharge. Other possible cases of spatially varied flow with decreasing discharge are side weir, lateral orifice and lateral slot. Using the experimental data collected in the present study as well as the data available elsewhere for different aspect ratios (L/B), the flow through the side sluice gate has been analysed by side weir flow and lateral orifice models. In the side weir model which uses the large orifice assumption, the variation of discharge coefficient CM with Froude number of approach channel flow has been studied. However, the wide scatter in the variation of discharge coefficient CM with upstream Froude number, restricts the utility of side weir model to the analysis of flow through side sluice gate. The lateral orifice model is found to be applicable for side sluice gate with modification of multiplying factor used in the mean discharge coefficient equation, which depends on aspect ratio L/B.