Update on fen plan: After consulting someone who has actually created fens, my plan has changed. I plan to use septic-system BioDiffusers (from Menards) buried in a trench above the fen to introduce water such that it flows up (my idea to replace well screens used by this fellow in the past). These will be covered with a geotextile to help keep dirt out). Below the fen, I plan to make a subsurface clay-lined core trench to force the water up before leaving the fen. In the slightly sloping fen, I plan to till in composted wood chips. We have ordered seed for native northern pitcher plants and round-leaved sundews to get started, since they can take years to grow large enough for successful transplanting