Scour depth downstream sharp-crested weir

Abstract Weirs are hydraulic obstructions constructed across an open-channel flow causing a rise in water which is useful to convert the channels upstream as well using these structures measuring device. There different types, and sharp-crested weir one of them. Local scour downstream most critical problems affecting their safety stability. Many studies conducted prevent facilities from collapsing, but effect adding solid apron still need deep studies. The current study included survey reduction consisting three lengths, four discharges, sand bed material calculate maximum depth length hole when solid. results proved that reduced 19.3% 27.7%, respectively, used. Two empirical equations were found determine with coefficient determination 0.892 0.804, respectively.