Michaela Stone : An embarrassment of riches ! My 1st question is what do you have for heavy duty Post hole diggers /excavation equipment !
Your story is classic for parts of N.C.; I am sure that just under your top soil you have a near impervious layer of Clay, The more Water soaks
into the clay, the more the pore spaces are filled, and the more water the clay takes up, The more it swells = Water impervious layer !
So - you need to find out if this clay layer is several meters deep, requiring extensive ditching and terraforming with fair to poor results, or if
Your clay layer may be a thin layer inches to feet deep and laying overtop of a porous layer of Gravel or Sand !
If you do have this lucky feature you can proceed with post hole diggers to create free drainage where none existed before ! I would strongly
Recommend marking all excavations / post holes at each location and on a corresponding map and proceeding Carefully and slowly !
As a minimum you will know more about YOUR sub-soil, this
should pay you for your work ! It is possible with creative Ditching / Terraforming
You may be able to improve drainage and block or shift springs to Alternate locations more favorable to your needs !
I hope this is timely and helpful, for the good of the Craft ! Big AL