| 摘要 |
A drain piping for forming buried drainage fields is formed from a flexible plastic pipe having periodically spaced restricted water flow orifices. Around the flexible pipe at each orifice is placed a larger diameter section of highly perforated drain pipe forming a drain cell; the cell is wrapped with a porous plastic cloth wrap (e.g. GeoTextile TM -a known membrane cloth for preventing dirt migration). This pipe can be directly buried in dirt filled trenches; no special drainage provisions, such as crushed stone are required. Each cell individually fills with and drains waste water and sludge. The inventive pipe can be laid in uneven terrain, including areas win which the water table may rise above the level of some sections of pipe. Even if drainage is temporarily blocked form one cell, the pipe will properly drain through the other cells.
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