Discharge Coefficient in Siphon Spillway with Different Cross Sections
Siphon spillways are structures that use in many dams and irrigation networks and drainage. The siphon spillway works under increasing discharge like an ogee spillway. At a certain point of discharge, the priming occurs and the flow is pressurized for larger discharges. Estimating the relationship between discharge coefficient and discharge with reservoir level in this spillway is an important parameter in the designing process. Commonly, the cross sections of siphon spillways are rectangular. The main purpose of this research is to make a comparison between circular and rectangular cross section and investigate the changes of discharge coefficient in these cross sections. In order to achieve these purposes two section physical models of siphon spillway, with equal cross sections are made. In this study, all experiments were done in condition siphon spillway non aeration or spillway with black water.