Unless your forge is standing on its end you'd need a hurricane to get much water inside, especially if you covered the doors. Drop the forge in a river, you have a problem but a few drops of rain are nothing.
That rail would work as well as anything else you have access to. If you have an 11" disk that is 1.75" thick then that must weigh 100 lbs or so(at a guess). Probably the wrong shape for an anvil but it could be useful as a base for the rail ...
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