Jamal M.V. Samani - Associate Professor of Water Structures Dept. of Tarbiat Mordares Univ,
M. Mazaheri - PhD Student of Water Structures Dept. of Tarbiat Modares Univ.,

Problems related to sedimentation and deposition can be minimized by using a system where weirs and gates are combined. Given its applications, the hydraulies of simultaneous flow over weir and under gate, in particular, the etermination of the stage-discharge relationship is of interest. While previous approaches have been based on regression or dimensional analysis, the curent work describes physically-based approach. Models of sharp-edged weris and gates with no lateral contraction are combind. To calibrate and validate the proposed model, experiments have been carried out in a laboratory flume applying different submergence conditions. It was found that the model is able to predict the stage-discharge relationship with reasonable accuracy.

combined flow, simultaneous flow, weir, gate, fully-submerged, semi-submerged, stage discharge relationship