Evaluation of Hydraulic Performance and Operation of Sluice and Neyrpic Modules in Water Distribution Canals (Case Study: Moghan Irrigation Network, Ardabil)

In the present study, the evaluation of hydraulic performance and operation of water flow measuring structures in the Moghan irrigation network has been reviewed and presented. In the Moghan irrigation network, 1246 intake gates have been installed to control and regulate the water level, except for the inlet gates at the dam site, Sluice gates have been used as flow measuring structures. Like other irrigation networks in the country, this network is facing the problem of imprecise flow measuring structures. For this reason, in the implementation of network improvement, about half of the structures were replaced with Neyrpic-Modules. In this research, by visiting the network and reviewing the available maps and information, four canals of the network were randomly selected, in each of the canals, water flow measurement tests and necessary surveys were performed on the structures. To measure the desired location, the actual discharge rate was measured at different discharge rates and in at least three replications by an ultrasonic flowmeter. In each structure, the actual discharge rate was compared with the nominal discharge rate of the structure used in its operation, and the relative error of the structures was obtained. The results of this study show that the average relative error of actual discharge and nominal discharge was between 7.11 to 34.38%. In the field of operation evaluation, improper sealing, destruction, and inefficiency of water level determination gates and opening of gates, decay, and manipulation of gates were some of the problems of operation of structures.