Pecan and Hican (and Walnut) soil needs

I understand that these types of trees all like well-drained soil. I also understand that they tend to drink a lot of water. I’m trying to figure out a way for them to get as much of their water needs from naturally present water as possible. I have a few places on my land where well-drained soil borders marshier hydric soil. In one case there is a distinct hill that slopes down into a distinct wetland. In another, there is a more gradual slope into soil that is definitely a bit marshy in winter/spring. My question is whether I can use these locations to get the best of both worlds: plant in the well-drained soil but close enough that the roots can extend into the wet to drink? Or will any contact with the poorly draining soil be a problem?

I'm focused right now on the hicans and pecans, but the question applies to various walnut species as well, since they seem to have similar soil and water needs, and I’m also interested in putting in some of those.

Pecan grow in my area in Kansas. I have seen trees on top of hill and next to rivers both do well. It can be hard to have trees in a flood zone because if the rain comes at the wrong time getting to the trees may be an issue. Here is a link to a pdf about pecan in Kansas https://bookstore.ksre.ksu.edu/pubs/mf1025.pdf

There are three big pecan tree at my parents that have been there for well over 50+ years and still have pecans. The trees sit on top of an hill. Good luck with your pecans!