A Flow Formula For Submerged Rectangular Weirs

Abstract

An equation is derived to obtain the discharge over a sharp-edge rectangular weir in the case of free and submerged conditions. A flow equation has been developed for discharge over a sharp crested rectangular weir in such a way that it can be used for both free and submerged flows. The presence of an upstream sloping face increases the discharge. This increase depends on the ratios between the downstream head H₂, the upstream head H₁ and the slope of the upstream sloping face. This increase in discharge depends on the width of weir in the direction of flow and on the ratio H₂/H₁.