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2. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   A round manhole cover of a given diameter has a smaller surface area than a square cover of the same width, thus less material is needed to cast the manhole cover, meaning lower cost. The bearing surfaces of manhole frames and covers are machined to assure flatness and prevent them from becoming dislodged by traffic.

3. Sanitary sewer - Wikipedia

   en.wikipedia.org/wiki/Sanitary_sewer

   A lift station is a sewer sump that lifts accumulated sewage to a higher elevation. They may also be used to prime an inverted siphon used to cross underneath rivers or other obstructions. The pump may discharge to another gravity sewer or directly to a treatment plant. [6]

4. Sanitary manhole - Wikipedia

   en.wikipedia.org/wiki/Sanitary_manhole

   The heights of this section vary depending on the depths of the manholes. Near the top is the cone section where it reduces from the size of the chamber to the size of the cover. Chimney section, also known as shaft, is a straight and narrow section that sits on top of the cone section but below the cover. The last is the cover section. [14 ...

5. 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 ...

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   AOL latest headlines, entertainment, sports, articles for business, health and world news.

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