暗管指利用地下管道排放污水的方式。
布线时要用暗管敷设，导线在管内不应有接头和扭结。
When you use the wiring laying underground pipe, wire in the pipes should be joint and kink.
暗管排水可以很好的控制排除农田地下水和土壤含水量，提高土地利用率。
Pipe drainage system has big control of excluding agricultural groundwater and soil moisture and raise the utilization of land area.
暗管排水在20世纪中期初步形成，近30 ~ 40年在美国、日本、埃及等国家得到广泛应用。
The subsurface pipe drainage came into being just in the metaphase of20th century. It was broadly applied in USA, Japan and Egypt for30 ~ 40years.
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