بررسي بازده كانال هاي انتقال و توزيع آب در شبكه آبياري گيلان و فومنات

Performance evaluation of conveyance and distribution canals in Gilan and Foumanat irrigation network

Since the worldʹs population is increasing very fast, the need for agricultural products exceeds this rate. So cultivation of more land should be considered. On the other hand, the limitation of water resources is another problem which makes the optimum use of water and soil resources necessary. Therefore, the development of new irrigation networks makes the evaluation of performance factors so necessary. In this study, conveyance and distribution efficiencies in Gilan and Foumanat irrigation network (Fouman, Rasht and Lahidjan Regions) with various types and qualities of canals were determined. The first step was to choose a reach with about 1000 m length in each canal. Then the water flow rate was measured in the upstream and downstream of each reach with a current meter in different times of day during irrigation season. The results showed that average conveyance efficiency in lined canals with high and medium construction quality, unlined canals and the Noroud River with 1100 m reach length was 90.9, 82.5, 77.2 and 69.9%, respectively. The average distribution efficiency in first order lined canals, first order unlined canals, second order unlined canals and second order flumes with a reach length equal to 700 m was 85.1, 67.9, 63.9 and 91.5%, respectively.