I just saw your recent video. It made me ponder. Why havent you made a decorative pond in the back or in the lowlands of your property? Like a trench in your trouble areas and even under your beds? 4" or 100mm pipe filter fabric or sock and gravel around it leading to the drainage pond? then a solar fountain or 2 to keep the mosquitos down. You said your area is clay ridden so it wouldent have to be lined, and to boot you get to play with a digger!