The Effects of Typical Small Irrigation District System Aging in Wuzhong Irrigation District on Farmland Irrigation

Wuzhong Irrigation District is one of the biggest irrigation districts in Guizhou Province.The irrigation project was constructed from1950s to 1970s.Up to now,most of irrigation canals can not work well because of aging,the average aging rate of canal system is 0.55,so that irrigation area and water efficiency of irrigation declines sharply.The present effective irrigation area accounts for 37%~54% of the designed irrigation area.Utilization coefficient of irrigation water is low in between 0.39~0.42.In this study,five typical irrigation districts are investigated and the impact of irrigation district system aging on farmland irrigation is analyzed.