I've read some stuff that said they're not actually for water crossing, but more to get an air intake that's above most of the sand and dust for desert or safari type driving.
Edit: Found this on youtube. It agrees that the primary purpose of dust nga, but also mentions water crossings but with preparation also done on the rest of the vehicle. Snorkel by itself wont be good enough, need to do other stuff like seal the airbox, extend diff breathers, etc. Also says that there are "snorkels" that are really just raised air intakes.





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