That's a fair bit of water, I usually run a bead of silicon over the top of the box to let the water run away so it doesn't go behind. And depending how much room and how important the stuff inside is I fill any holes coming if I have enough cable to play with. But I always put a drain hole in. I've seen it a few times where poor joins in the conduit has let water in and that's gone down and filled the enclosure.
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