Evaluation index of irrigation water efficiency and case verification

Irrigation water efficiency assessment index reflects the irrigation project status,the irrigation water management level and irrigation technique level.However,there is no universal assessment index system for all types of irrigation areas.In this paper,on the basis of the abundant practical investigation,combining the actual situation of irrigation area,the irrigation water efficiency assessment index was put forward and corresponding calculation formula was defined.Referring to the advanced irrigation water use efficiency both domestic and abroad,water use efficiency classification was determined,and gradation standards for large-sized,medium-sized and small-sized irrigation area were proposed.Based on fuzzy theory,a model for irrigation water use efficiency evaluation was established,and it was applied to typical irrigation area as a case study.The result shows that irrigation water efficiency of Ganqiaowan irrigation area is close to high level,meanwhile Shuangshuxiqu irrigation area and Tangjiaoqu irrigation area are a little bit higher level,and the others are medium level or less than medium level.That the result is consistent with the actual situation verifies the rationality and practicality of the above assessment index,standards and model.