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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.
Sanitary manhole. A sanitary manhole (sewer manhole, [1] sanitary sewer manhole[2] or sewer maintenance hole[3]) is a manhole that is used as an access point for maintenance and inspection of an underground sanitary sewer system. Sanitary manholes are sometimes used as vents to prevent the buildup of pressurized sewage gas. [4]
Permeable paving surfaces are made of either a porous material that enables stormwater to flow through it or nonporous blocks spaced so that water can flow between the gaps. Permeable paving can also include a variety of surfacing techniques for roads, parking lots, and pedestrian walkways. Permeable pavement surfaces may be composed of ...
FDNY = FDNY. GAS = Brooklyn Union Gas. HPFS = High Pressure Fire Service. IRT = Interborough Rapid Transit. JWS = Jamaica Water Supply Company of New York. KCEL&PC = Kings County Electric Light and Power Company. KCR Co. = Kings County Refrigerating Co. [Gansevoort Market area] LIC = Long Island City. LIRR = Long Island Rail Road.
Precast concrete is a construction product produced by casting concrete in a reusable mold or "form" which is then cured in a controlled environment, transported to the construction site and maneuvered into place; examples include precast beams, and wall panels, floors, roofs, and piles.
Liam Rappleye, Detroit Free Press. September 6, 2024 at 4:38 PM. A manhole cover in downtown Detroit, at the corner of Congress and Bates, launched off the ground Friday afternoon, sending one to ...