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Shortly before 5:30 a.m., a manhole cover lifted off from its launching pad on Hill Street in Old Louisville and blasted through Pam Smith's roof, decking a coffee table in the process.
[2] [7] [14] Manhole covers shot up into the sky and came crashing down with great destructive force. [ 14 ] [ 15 ] [ 16 ] One manhole cover crashed completely through the ceiling and floor of a third-floor apartment on Second Street, and another narrowly missed a child when it landed in a house at the corner of 9th and Hill streets. [ 15 ]
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 sanitary manhole under construction. 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 ...
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A test with both ends of the pipe open gave only a small flash of flame; when the ends were closed, all three covers flew off. The addition of metal debris to the pipe, simulating junk that might collect in a real sewer, launched the covers even higher due to a faster, larger flame front moving around all the obstructions.
The manhole cover business has turned over the years, from the sort of ornate covers that a business like Berry’s Foundry might have crafted to drabber covers that dot Sacramento’s streets today.