我国的灌区,按灌溉水源来分,利用水库、塘坝蓄水的约占31％,由河川自流引水的约占28％,利用泵站提水的约占19％,利用地下水灌溉的约占18％,其它约占4％。不少灌区还实行引、蓄,提相结合,地面水和地下水联合使用。全年有效灌溉面积在1万亩以上的大中型灌区共5281处,共3.11亿亩,占全国灌溉面积的43％。其中30万亩以上的大型灌区137处,全年引提水量约在750亿m~3左右,灌 The irrigated area in our country is divided into irrigation water sources, using reservoirs and ponds for about 31% of water storage, about 28% of water diversion from rivers, about 19% of using pumping stations, and about 18% of using groundwater for irrigation %, Others account for about 4%. Many irrigation areas also implement the lead, storage, mention a combination of surface water and groundwater combined use. In the year, there were 5,281 large and medium-sized irrigated areas with an effective irrigated area of ​​more than 10,000 mu, with a total of 311 million mu, accounting for 43% of the irrigated area in China. Among them, there are 137 large-scale irrigated areas above 300,000 mu. The annual water demand is about 75 billion m 3,