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in Problem solving
Any tree will be thirsty but will obviously have quite a lot of root. As I posted on another thread, I know someone who had a boggy spot in his garden so he built a pergola next to it and planted a large climbing rose. It worked.
Make the most of it and grow plants that like the conditions. There are some lovely plants that grow in boggy areas. I wouldn't choose a willow though, they don't know when to stop.. Astilbes and rodgersias, ligularias. Lots of them out there.
I would avoid growing any tree or bush over or near a soakaway and drainage system. If the ground is very boggy, possibly try some perrenial bog plants, astilbes, hostas, primulas, iris
Or, if you have the sapce, a gunnera.