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An Experimental Study on the Effect of Vortex Breakers on Discharge Coefficient for the Shaft Spillways with Sharp Edge and Wide Edge Original Article, D82 Nohani E. J. Civil Eng. Urban. 4(5): 546-549. 2014 ABSTRACT: Shaft spillways are used where there is not adequate space to build other types of spillways to convey flood water from reservoirs downslope dams because shaft spillways are placed on upslope dams and inside dam reservoirs. This spillway has three parts: crest, shaft and tunnel. Shaft can be built vertically. In the earth embankment dams it is better not to build on the body of dam. Here morning glory spillway is very useful. The major problem with these spillways is the strong spiral vortices in the inlet which will reduce the efficiency of tank discharge system. In this paper, the physical model was constructed and the effect of vortex breaker plate on the power of spiral vortex and the efficiency of flow system was studied. Once the data were analysed, the conclusion was that a 20% increase in spillway discharge coefficient was experienced via using blade-vortex breaker and the increase in spillway discharge coefficient with sharp edge was more than a wide-edged. Keywords: Vortex, Shaft Spillway, Vortex Breaker Plate, Hydraulic Model. منبع: [Hidden Content] دانلود: [Hidden Content].,%204%20(5)%20546-549,%202014.pdf J. Civil Eng. Urban., 4 (5) 546-549, 2014.pdf