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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. Round castings are much ...

3. 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 ...

4. 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 ...

5. Sanitary sewer - Wikipedia

   en.wikipedia.org/wiki/Sanitary_sewer

   Effluent sewer systems, also called septic tank effluent drainage (STED) or solids-free sewer (SFS) systems, have septic tanks that collect sewage from residences and businesses, and the effluent that comes out of the tank is sent to either a centralized sewage treatment plant or a distributed treatment system for further treatment. Most of the ...

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