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The Hydraulic Investigation of Perforated-Cylindrical-Intake Structure Original Article, D76 Fendereski R, Masoudian M, Kordi E, Röttcher K, Gharahgezlu M. J. Civil Eng. Urban. 4(5): 509-514. 2014 ABSTRACT: Water surface level regulation and deviation of a constant value of discharge into the side channel, is the basis of the intake systems in irrigation channels, considering the main discharge rate fluctuates during the seasons. Hence, the necessity to design a structure which can control the consequences of discharge fluctuation in main channel and divert the constant value of demand water flow is more recognizable. The perforated-cylindrical-intake instrument is a new model of regulator-intake function, includes a free overflow on a cylindrical weir associated with intake element that can fulfil the main objective of a regulator and an intake devices, simultaneously. This research firstly, examined the different geometric conditions of the structure and determined the best one, then, tried to investigate the hydraulic function, operation method and the correlation of the intake discharge and upstream flow depth versus the discharge of the main channel in various condition of the structure based on an experimental work. The results show that in wide range of discharge variation in the main channel, the intake discharge variation were not considerable, also, it would be possible to measure and control the intake discharge precisely, installing a counter and a valve at the side channel. Key words: Cylindrical weir-gate; Over-under flow; Intake; Orifice. منبع: [Hidden Content] دانلود: [Hidden Content].,%204%20(5)%20509-514,%202014.pdf J. Civil Eng. Urban., 4 (5) 509-514, 2014.pdf