Hydraulic analysis of a combined system: rectangular weir with a rectangular gate

Abstract

: combined system, weir, gate, hydraulic analysis Abstract. This study explores the hydraulic analysis of a combined system of rectangular sharp-crested weirs and rectangular gates, essential to control water flow in various applications. The weirs and gates are used for flow measurement in water distribution systems, reservoirs, sewage systems, and irrigation networks. The study aims to optimize design and operational strategies for the combined system, contributing to the field of hydraulic engineering. Five models of compound rectangular weirs with rectangular gates were tested using a downstream support. The first three models had a gate width of 10 cm, while the remaining two had a lower opening width of 10 cm and gate widths of 8 cm and 6 cm. The discharge coefficient increases with water head ratio as shown in experimental runs with gate width = 10 cm and lower weir width = 10. The discharge coefficient rises by 10.81 % due to a decrease in the lower opening weir with a constant gate width. It increases by 29.14 % as the gate width decreases with a continuous lower opening.