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Why manholes are round?

+3 votes
posted Nov 25, 2014 by anonymous

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1 Answer

+2 votes

A round manhole cover cannot fall through its circular opening, whereas a square manhole cover could fall in if it were inserted diagonally in the hole. Circular covers don't need to be rotated or precisely aligned when placing them on the opening. A round manhole cover is easily moved and rolled.

answer Nov 25, 2014 by Manikandan J