Interesting video - I didn't know that about sycamores. We have several big sycamores and we have a lot of water.
In fact here in wet west Wales too much water is usually the problem rather than not enough! Springs pop up everywhere here.
For buying property here my advice would be to make sure you check it out at the wettest time of year if you can (probably Feb - April) to see how wet the land gets, and whether it suffers from flooding.