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manhole-cover-sidewalk-washington-dc.tif
A steel manhole cover with the word "water"  within a cracked sidewalk, Washington, DC. Manhole covers are manufactured  round mainly to prevent the manhole cover from falling into the opening that it covers. A square manhole cover could easily be dropped into a square manhole by holding the cover diagonally.
Original Rights Managed Stock Photography Created By Sam D'Amico