I live in Chile where the land slopes up into the hills just a few meters from the coast. I have a garage at sea level with the back wall in the ground and there's a little river flowing inside it. I am told it's from leaking sewage tanks above and a normal phenomena. It's like a liter of water per hour - it's significant, not just a wet wall.
Knowing that some plants require a significant amount of water and considering behind the garage is just a lawn, would it be possible to remedy the problem with plants? There's around 10 square meters of space and it's pretty sunny. The roots would need to go 2-3 meters down. Are there plants suitable for this? Which plants evaporate most water? Does it even make sense? :-)
Edit: A bad vertical panorama of the location from above:
It's not ground water, it's leakage from sewage water tanks on the hills above. Or so I'm told, but it can't be ground water, the levels aren't that high here.
EDIT: Late revelation: It actually IS ground water. The slope was artificially created and apparently they dug a bit too deep. I guess it's time for a pond. :-)