posted 9 years ago
It shouldn't be a terrible problem, as long as you address the water-table issues.
Planning a French drain at the roof overhang might not be enough, and you have to think about where the water is then going to run off too.
Already saturated clay generally won't take extra water, not fast enough for draining purpose anyways. Generally there's a weeper tile drain in a rubble trench, and adding the French drain includes run-off, this has to go somewhere. If there's no county/town/village supplied ditch because your property isn't right along the road, this generally means your going to have to dig a drainage ditch somewhere near the house or along the property, and run the weeper drainage into that from your house site. Then that still has to run somewhere too.
So, take another look at your site where your planning on putting your house, and at your slope.
How steep is your slope and if things are that wet, is there going to be a want of a retaining wall in the future? You might want to rethink the placement of the house.
Digging drainage ditches around the property, or at least around your homesite, should work on diverting the water away from the house itself. But then you have to consider where those ditches are draining -too- as well, and that depends on how close you are to a road system, or if your basically off-grid and can get away with.
But, there's professionals on here who'll get to you eventually, so don't take my word on anything. Ask your neighbours if you can how they've dealt with it, someone's going to have wanted a basement or at least a half-basement crawlspace and run into it in your area.
My parents built their 'new' home by hand, as we tend to do around where they live, on a damned -bog- because it was the cheapest land they could afford that the government would clear. It's basically shaped like a standard acre, a long lot. Even with the village ditch out front, the water table was stupidly high. Dad had to dig a ditch along both sides of the property(within 30 feet of the house), and across the back of the house(not the back line of the property because it went to far back about 50ft back), that then drained into the village supplied ditch in front of the house, it's only now 20 years later, that the ditches are running somewhat dry, and that's more to do with the alder bushes clogging them and the main bog out back of the house running dry.
As for your earth-floor, if you address enough drainage, it should stay dry enough, but some areas have issues where the clay smells, and it works it's way up thru the floor(it's horrible around here. The clay is a blue/grey beachy clay and it -stinks-). So you might want to think about testing it(I think the easiest way is just filling a clean bucket half full, putting a lid on it and letting it sit for a few hours, taking off the lid and smelling the bucket - it might smell like rot, wet dirt or hopefully, nothing at all). Either way, your going to want to insulate it somehow.
Not growing or raising anything at the moment, but I'm here doing research for the future.