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Most of it evaporates. Either before it is absorbed into the tree or afterwards through transpiration.

I doubt that. A lot of it sinks into the ground... plants don't absorb everything.

The nut is probably drier relative to the rest of the tree (especially compared to the leaves and the flowers) and then we usually roast or smoke & maybe salt them, so I would expect there to be low water content in the final product compared to the totality used in production.

That's a great question. I wonder if there's a more efficient way to water the plants that doesn't involve saturating all of the area around the roots just to ensure they can absorb the water?

Deep pipe irrigation (if they aren't already using it).

http://permaculturenews.org/2014/04/24/get-started-efficient...

Same place it ends up when you rip out your flow regulator and take a 90-minute shower, or maintain a lush green lawn.

So, reclaimed by the city and turned into safe drinking water?