地下管道输水灌溉,是指用管道代替明渠,埋在地下一定深度,以低压方式向田间输送灌溉水流,并通过必要的调压、通气以及管道上的分水、放水建筑物和控制闸、阀等设施,安全而有计划地进行灌溉的技术。近年来,由于水资源和能源短缺,人均占有耕地面积日趋减少,一些发达国家如日本、美国、奥地利等的农田灌溉系统有以管道代替明渠的趋势。在我国,地下管道输水灌溉技术正处于开发阶段。从六十年代中期,许多省(市)即先后开展了试验推广。据不完全统计,苏、浙、闽、赣、川、沪等6省市地下管、渠输水灌溉面积已达300多万亩;豫、鲁、京、津等省市也先后试办了一些。近两年北方地区持续干旱,促进了这一技术的发展。鲁、冀、津的一些市县出现 Underground water pipelines irrigation, refers to the pipeline instead of open channel, buried in the ground to a certain depth, low pressure to the field of irrigation water, and through the necessary pressure, ventilation and water diversion on the pipeline, water and building control gates, Valves and other facilities, safe and well-planned irrigation technology. In recent years, owing to the shortage of water resources and energy, the per capita arable land area has been declining. The irrigation systems in some developed countries, such as Japan, the United States and Austria, have replaced the open channel with pipelines. In our country, underground pipeline irrigation technology is in the development stage. Since the mid-1960s, many provinces (municipalities) have successively carried out experimental promotion. According to incomplete statistics, the underground pipe and canal drainage irrigation area in the 6 provinces and municipalities of Jiangsu, Zhejiang, Fujian, Jiangxi, Sichuan and Shanghai reached more than 3 million mu; provinces such as Henan, Shandong, Beijing and Tianjin also piloted some. The continuous drought in the northern region in the past two years has promoted the development of this technology. Some cities and counties in Shandong, Hebei and Tianjin appear