用低压管道输水灌溉,具有省水、节能、节地、对地形变化适应性强、管理运用方便等许多优点。发达国家已广泛使用低压管道输水灌溉。我国上海市和河南省温县在六十年代就相继使用混凝土管道灌溉系统。1965年,江苏省无锡县创造了灰土地下渠道,灰土地下渠道一般采用圆拱直墙形断面和现场夯筑的施工方法。这种压力管道的水力特性怎样?这是人们关心的问题,因为它是灌溉工程规划设计的重要依据,直接影响着管径的选择和泵站扬程的 Low pressure pipeline irrigation, with water, energy saving, land, adaptability to changes in the topography, management and easy to use, and many other advantages. Developed countries have widely used low pressure pipelines for water conveyance. Shanghai, China and Wen County, Henan Province in the sixties have been using concrete pipe irrigation system. In 1965, Wuxi County, Jiangsu Province, to create a limestone underground channels, limestone underground channels generally use circular arch straight wall-shaped cross-section and the construction of the site ramming. This kind of pressure pipe hydraulic characteristics? This is a matter of concern because it is an important basis for irrigation planning and design, a direct impact on the choice of diameter and pumping station lift