5 低压输水管道 以管道替代土渠进行输水是世界各国认同的发展趋势。低压管道输水可以采用各种管材、管径的管道将水从水泵一直输送到田间进行地面灌溉,输水管道几乎全埋在地下。它所具有的优点主要是水的有效利用率高(约95％,比土渠提高30％～40％);工作压力低(≤0.02～0.2MPa,可节能20％～25％); 5 Low-pressure water pipelines Pipeline to replace soil canals for water conveyance is the development trend recognized by all countries in the world. Low-pressure pipe water can be used for a variety of pipe, pipe diameter pipe from the water pump has been transported to the field for surface irrigation, water pipe almost buried in the ground. It has the advantage of the main water efficient utilization rate (about 95%, 30% to 40% more than the canal); low working pressure (≤ 0.02 ~ 0.2MPa, saving 20% ​​to 25%);