The Hindus in India constantly experiment with this situation by releasing zombies onto their rivers every day. The general consensus is that they just float along with vultures eating their faces, until they land up on the river bank and are dragged away by jackals.
The Zombie Survival Guide (the book before World War Z) tells me that zombies don't require sustainance, so either survive indefinitely underwater (e.g. if you put one in concrete shoes it would still be a threat to divers) or bob around on the surface due to being bloated with gases.
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