Why doesn't snow accumulate on manhole covers?

Why doesn't snow accumulate on manhole covers?
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1 Answer

Answer :

Manhole covers tend to be warmer because of the air from the sewer pipes also being warm. I assume sewer pipes are heated or at least insulated, because they can’t get cold enough to let their contents freeze, thus the heat would travel upwards as heat does, and cause the manhole cover to become warmer, thus melting any snow that lies on it.
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