This suggests to me that the “tile” approach is not the right one. Your comment on temps, below, reinforce that idea.
We don’t get the rain you do (we do get 50+ inches on average and my place got 72" last year) but I’m acutely aware of the problem. We also get both “frog stranglers”, hurricane remains, and big, wet systems that stall over us for days at a time. I made some mistakes in planning some things and did better in others. But the KEY is taking the time, and spending the money, to address water issues before construction begins. If you don’t then there the costs in time and dollars to fix what should have been addressed earlier can really add up.
One resource you’ve already paid for is the expertise of the Extension Service and the Soil Conservation Service. Ours here will make “site visits” and help plan out water management strategies. You have to be a bit careful as they are government people and are more than willing to spend large amounts of YOUR money on your problem!
Listen to them, but with a “critical ear.” Sometimes you can take their base idea and use it but not use the level of resources they sometimes recommend. They will try and give you a 100% solution. But sometime you only need an 80% solution. That puts a risk on you, but maybe a liveable one. Like so many things, “it depends.”
Use them, though, as it’s already paid for with your taxes. Craft their advice to specifically fit your needs.
Good luck in your program.
G.