Physical model studies of new bottom outlets in Iran

Bottom outlet conduit is an important part of a dam which may act as a service spillway, a flood or reservoir control regulator, or/and a sediment control for the reservoir. Usually in these structures the flow velocity is high and consequently, cavitation damages are inevitable. Therefore, due to the importance of these structures it is necessary to extend our knowledge on the base of physical studies of these structures. Among the main problems of these structures, we can mention of the impact of jet to the boundaries downstream of gates, flow discharge, destructive vibrations of gates, cavitation occurrence downstream and/or upstream of gates, and the flow condition. In this work experimental results of some new bottom outlets in h-an are reported together with their physical and hydraulic characteristics. This work will provide information, useful for the designer of these structures.