posted 8 years ago
as I live in mid tennessee also I know all too well what you're talking about when it comes to the rains. I've lived in the region for 40 years, and it used to not be like this in the 80's or really the 90's even. Now it seems every time it rains, it's gonna be 1 to 2 inches in an hour or so. I recently built a couple small berms with 20 yards of soil around my garden to redirect flowing surface water to prevent it from washing out the mulch I have in between my raised beds. I also planted blueberry bushes and raspberry canes in said berms and so far they seem to be liking the environment. What I can recommend is you ask the seller of the land to provide a perc (percolation) test of the grounds. They do these type of tests before installing septic systems. It will show how much water the soil can absorb and how fast it drains. If the house already has a septic system, they may not pay for the test.
You cited that you see evidence of washout on a hill, and it may just be the grade of the land on the hill causing the ruts as our lovely tennessee torrential downpours are more than the land can absorb in the given amount of time the rain falls. I am not an engineer, but I took a good look at the lay of my land with an analytic eye and figured the berm idea I had would suffice, and it has worked well for me. I had thought about digging trenches to guide the water to where I want it to go, but food crops don't grow well in trenches, so I went for berms. (they're about 18 inches tall and almost 3 feet wide and about 40 feet long). There's almost always a solution to a problem. Hope this helps!
"Study books and observe nature; if they do not agree, throw away the books." ~ William A. Albrecht