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1988年,我们在水利部“低压暗管输水灌溉万亩试验片”中,试建了33条,一种用普通塑料软管作管道输水内膜,用灰土作保护的地下暗管,计1万多米.这种暗管与同类渠道相比,投资少(每米管道约2.5～4.O元),施工快,管道扬程损失最小(糙率为0.008)、渠道水利用系数最高(0.97～0.99),适合当前农村单户或联户使用,现将实践中的体会简介如下.
In 1988, we built 33 pieces in the Ministry of Water Conservancy’s “Low-pressure Hidden Pipe Irrigation Irrigation Tests”, a type of underground pipe that uses ordinary plastic hoses to transport water to the intima and underground with dark earth for protection Compared with similar channels, this type of concealed tube has the advantages of less investment (about 2.5-4.0 yuan per meter of pipe), quick construction, minimum loss of pipe head (roughness 0.008), water utilization of channels The highest coefficient (0.97 ~ 0.99), suitable for the current single-family rural or joint use, now the practice of the experience is as follows.