我省现有自流灌区8000多处,设计灌溉面积2964万亩,有效灌溉面积1539万亩。其中,30万亩以上自流灌区25处,设计灌溉面积1792.5万亩,有效灌溉面积994.5万亩。据统计,自流灌区年均引水量30亿立方米,实灌面积1050多万亩。这些灌区在抵御旱灾和促进我省农业“一优双高”开发中,发挥了不可替代的巨大作用。据1988—1992年灌溉效益调查分析,全省自流灌区年 At present, there are over 8,000 self-flowing irrigation areas in our province, with 29,640,000 mu of irrigated area and 15,390,000 mu of irrigated area. Among them, there are 25 autotrophic irrigated areas above 300,000 mu with an designed irrigated area of ​​17,925,000 mu and an effective irrigated area of ​​9,945,000 mu. According to statistics, the average annual water diversion irrigation area is 3 billion cubic meters and the real irrigation area is more than 1050 mu. These irrigated areas have played an irreplaceable role in preventing drought and promoting the development of agriculture in our province. According to 1988-1992 irrigation benefit survey and analysis, the province gravity irrigation district