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2. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   A round manhole and its cover. A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.

3. Geocomposite - Wikipedia

   en.wikipedia.org/wiki/Geocomposite

   Such geocomposites are regularly used in intercepting and conveying leachate in landfill liner and cover systems and for conducting vapor or water beneath pond liners of various types. [3] These drainage geocomposites also make effective drains to intercept water in a capillary zone where frost heave or salt migration is a problem.

4. Cellular confinement - Wikipedia

   en.wikipedia.org/wiki/Cellular_confinement

   Early research (Bathurst and Jarrett, 1988) [13] found that cellular confinement reinforced gravel bases are "equivalent to about twice the thickness of unreinforced gravel bases" and that geocells performed better than single sheet reinforcement schemes (geotextiles and geogrids) and were more effective in reducing lateral spreading of infill under loading than conventional reinforced bases.

5. Permeable paving - Wikipedia

   en.wikipedia.org/wiki/Permeable_paving

   Plastic grid systems are also popular with homeowners due to their lower cost to install, ease of installation, and versatility. The ideal design for this type of grid system is a closed cell system, which prevents gravel/sand/turf from migrating laterally.

6. Manhole - Wikipedia

   en.wikipedia.org/wiki/Manhole

   Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially where cover theft is of concern ...

7. AOL Mail

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