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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.
A manhole (utility hole, maintenance hole, [1] or sewer hole) is an opening to a confined space such as a shaft, utility vault, or large vessel. Manholes, typically protected by a manhole cover , are often used as an access point for an underground public utility , allowing inspection, maintenance, and system upgrades.
Manhole access to sewer Schematic of a conventional sanitary sewer to convey blackwater and greywater from households to a centralized sewage treatment facility. [3] A manhole cover for a sanitary sewer access point. View looking down into an open manhole showing two converging sanitary sewer lines.
A series of sewer explosions rocked Louisville on Friday, Feb. 13, 1981, sending manhole covers flying and leaving gaping holes in multiple streets across the city.
A manhole cover unable to contain a sanitary sewer overflow. Sanitary sewer overflow is a condition in which untreated sewage is discharged from a sanitary sewer into the environment prior to reaching sewage treatment facilities. Manholes are common locations of sanitary sewer overflows.
A drain cover is a cover with holes (e.g. a manhole) or a grating used to cover a drain, to prevent unwanted entry of foreign objects, or injury to people or animals. It allows drainage of liquids but prevents entry from large solid objects, and thus acts as a coarse filter. A sink drain cover is a drain cover used to cover the sink drain.
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