Since the hydrant is below ground, it doesn't freeze and burst, as it would with an above ground pipe.
How do yours prevent freeze bursts in cold weather?
The hydrants are normally under the road, and so the snow and ice is cleared by the snow ploughs and gritters.
Never heard of a problem, but I guess if there was that much flood water then they would pump the flood water. Here they do sometimes pump river or pond water for fires, and they also have the job of pumping flood water to remove it from where it is unwanted.
It is fairly normal for the hole to be full of water, and if it isn't when they start, it will be by the time they have finished!
We have a thing called a standpipe that goes down the hole, then they connect to the top which is easy to get to. The tap is already in the hole, turned on with a long key, you don't need to be able to see down the hole, just know where it is and the rest can be done by feel.
Our fire hydrant standpipe is made from quality aluminium alloy and is a simple solution to bringing water above ground from a mains underground hydrant. With a single standard UK 2.5" instantaneous outlet onto, you can securely connect the layflat fire hose.The fire hydrant standpipe itself...
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There is one seen in use
here, although that one turned out not to be in the road, should still be gritted though.