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  2. Land drains - Wikipedia

    en.wikipedia.org/wiki/Land_drains

    This can be installed in an excavated trench. Specialised mole ploughs are available that can form the hole, insert the perforated pipe (and gravel if required), all in one simultaneous and continuous process. An extremely powerful (usually tracked) tractor is necessary. The flexible pipe is carried as a roll on the back of the machine.

  3. Geonets - Wikipedia

    en.wikipedia.org/wiki/Geonets

    The connection of geonets to perforated drainage pipes is difficult and extremely important. The geonet's outlet must be free draining at all times even in winter under freezing conditions. Notwithstanding the above concerns, geonets are very impressive with respect to their flow-rate capability, ease of construction, savings in airspace, and ...

  4. French drain - Wikipedia

    en.wikipedia.org/wiki/French_drain

    A diagram of a traditional French drain. A French drain [1] (also known by other names including trench drain, blind drain, [1] rubble drain, [1] and rock drain [1]) is a trench filled with gravel or rock, or both, with or without a perforated pipe that redirects surface water and groundwater away from an area.

  5. Invert level - Wikipedia

    en.wikipedia.org/wiki/Invert_level

    Invert level affects flow from drainage pipes In civil engineering , the invert level is the base interior level of a pipe, trench or tunnel ; it can be considered the "floor" level. [ 1 ] The invert is an important datum for determining the functioning or flowline of a piping system.

  6. Drainage - Wikipedia

    en.wikipedia.org/wiki/Drainage

    Point drainage, which intercepts water at gullies (points). Gullies connect to drainage pipes beneath the ground surface, so deep excavation is required to facilitate this system. Support for deep trenches is required in the shape of planking, strutting or shoring. Channel drainage, which intercepts water along the entire run of the channel.

  7. China's exports slow, imports decline in November, falling ...

    www.aol.com/news/chinas-exports-slow-imports...

    The effects of tariffs will likely only be felt in the middle of 2025, Huang wrote. Exports to the U.S. grew 8% in November compared to the same period last year, while outbound goods to the ...

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