Evaluation of Efficiency the Butterfly Gate as a Structure for Control and Flow Measurement in Semicircular Canals

In this study, a new structure called that the butterfly gate is introduced to control and measure the flow in canals, which is usually a parabolic or semicircular cross section. For this purpose, the hydraulic performance of this gate and the effect of flow parameters and gate opening angle on the flow depth have been investigated in a semicircular canal.  Also in this study, with using a data collection system and recording of the pressure data at different point in canal determined the depth flow while providing the stage-discharge relationship curves for different opening angles, two methods are presented for estimation of flow discharge through the butterfly gate. This estimation can be used both as a separation technique of each angle and as a data aggregation technique. The precision of these methods have been evaluated by using the statistical indices. The results show that, the each method with a high accuracy 95% can estimate the discharge through in canal.