I have no personal experience with waterfalls or any similar water features being kept inside an animal's enclosure. I do know I've seen a few keepers use them without problems but you have to think about any possible harm or difficulty that would come with that feature. I guarantee it won't be too easy to clean a waterfall every few weeks when you are supposed to clean the entire enclosure. I know with hatchling BPs there was a worry that they could somehow get inside of the water feature to use it as a hide and could harm themselves, but from the size of the snake in your avatar I assume you won't have that problem. In my opinion, there are much easier methods of raising the relative humidity inside an enclosure without adding another item that requires upkeep and cleaning. Obviously, you are going to be the one cleaning it so you have to decide whether the expense is worth the upkeep!
Good luck!
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