Flow over trapezoidal side weir

In this paper, the hydraulic characteristics of a sharp crested trapezoidal side weir have been experimentally and theoretically investigated. It was found that the DeMarchi coefficient of discharge for a sharp crested trapezoidal side weir in subcritical flow is related to the main channel Froude number, the side slope of weir, ratio of weir height to upstream depth of flow and ratio of weir length to upstream depth of flow. Suitable equations for the discharge coefficient are also obtained.

► We proposed new equations for the discharge coefficient in the trapezoidal side weir.
► The discharge over the trapezoidal side weir is measured.
► Discharge over the trapezoidal side weir has been theoretically investigated.
► The procedures for computation of discharge for a trapezoidal side weir were also introduced.