引泾灌溉始于秦。一九二九年在清代龙洞渠的基础上修了“泾惠渠”,到解放时,渠道破烂,土壤恶化,沼盐为害,灌溉面积不到五十万亩。粮食平均亩产二百六十多斤。解放后在毛主席革命路线指引下,经过民主改革,实行计划用水,扩建、改善渠道,引水能力由16秒立米增加到五十多秒立米,灌溉面积扩大到一百三十万零五千亩。灌区水源主要靠引泾河水自流灌溉,无水库调节。渠首大坝以上年来水量虽有19.5亿立米,但季节分配不均,枯洪变化较大,含沙量高,实际引入年水量只有3.7亿立米,据年需水量8.3亿立米,差4.6亿立米,占年总需水量的55%。其中:夏灌需水量4.5亿立米,实际引水量1.2亿立米,差3.3亿立米,占夏灌总需水量的73%,不能完全 Jijing irrigation began in Qin. On the basis of the Longdong Canal in the Qing Dynasty in 1929, the “Jinghui Canal” was rehabilitated. By the time of liberation, the channel was dilapidated, the soil was deteriorating, marsh salt was harmed and the irrigated area was less than 500,000 mu. Average grain yield two hundred and sixty kilos. After the liberation, under the guidance of Chairman Mao’s revolutionary line, through democratic reforms, the planned water use, expansion and improvement of channels were carried out. The water diversion capacity increased from 16 seconds to more than 50 seconds and the irrigated area expanded to 1.30 million acres . Irrigation water mainly by the introduction of Jing River water gravity irrigation, no reservoir regulation. Although there were 1.95 billion cubic meters of water in the drainage dams in the past years, the seasonal distribution was uneven, the floods varied greatly and the sediment concentration was high. The actual annual water intake was only 370 million cubic meters. According to the annual water demand of 830 million cubic meters and the difference of 460 million Li meters, accounting for 55% of the total annual water demand. Of which: summer irrigation water demand of 450 million cubic meters, the actual water diversion 120 million cubic meters, 330 million cubic meters difference, accounting for 73% of summer irrigation total water demand, can not be completely