Evaluation of hydraulic performance and operation of Neyrpic Modules in the main distribution canal (Case study: Yamchi irrigation network, Ardabil)

In this study, hydraulic performance and operation of Neyrpic gates on the main water distribution canal of Yamchi irrigation network (Ardabil) were evaluated in 2016-2017. For the purpose of this research, a 4 km long range with 7 offtakes and a total covered area of 2,375 hectares was selected. Then, during the operation period, the flow velocity at the specified points was measured by velocity meter and by determining the cross-sectional flow, the inlet discharge to the offtakes was calculated. By measuring the flow delivered to the offtakes and comparing them with the nominal flow, the relative error of the Neyrpic module gates was determined. Then, by calculating the indicators of adequacy, efficiency, dependability, and equity of water delivery, the performance of the distribution canal in the delivery of water to the users was evaluated. The analysis of the results showed that the accuracy of flow measurement in all offtakes is high and water delivery to the consumers is performed with less error, so that the maximum relative errors was 10.6%. In the case of using agricultural requirement water in determining the assessment indicators, the performance of the water distribution canal is poor due to the adequacy index, but based on the efficiency, dependability and equity of water delivery indicators, is at a good level.