Manhole

A manhole or maintenance hole is the top opening to an underground vault used to house an access point for making connections or performing maintenance on underground and buried public utility and other services including sewers, telephone, electricity, storm drains and gas. It is protected by a manhole cover, a (usually metal) plug designed to prevent accidental or unauthorised access to the manhole.

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Manholes are generally found in urban areas, in streets and occasionally under sidewalks.

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Outside the Wales Millennium Centre in Cardiff Bay is a cobble manhole.

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In rural and undeveloped areas, services such as telephone and electric are carried on pylons.

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Vault: In architecture, a vault is an arched structure of masonry, forming a ceiling or canopy. Vaulting makes it possible to roof over a comparatively large space using bricks, stone blocks or concrete. Until the development of metal girders and trusses in the 19th century, the only alternative was to use...

Public utility: A public utility is a company that maintains the infrastructure for a public service. Public utilities often involve natural monopolies, and as a result are often government monopolies, or (if privately owned) treated as specially regulated sectors....

Sewers: REDIRECT Sewer...