07:30AM | 04/02/03
Member Since: 03/30/03
1 lifetime posts
My wife and I have just purchaced 3/4 of an acre that is partially sloped. It also has 2 springs on the property. We will not be able to build till later this fall and I was wanting to go ahead and install the french drain myself before construction. We have an idea of where we want the house and it is partially over one of the springs. Can I put the drain deep enough no to inerfer with the foundation and still take care of my drainage problem now. The soil is gray clay and doesn't absorb much, also the house will have no basement and will be on a slap foundation. Thanks for any help,


01:50PM | 04/02/03
Member Since: 01/14/03
264 lifetime posts
I don't see any reason why you can't install a drain, but only if you have a place on your lot that's low enough to reach with a pipe sloping constantly downward from the elevation you start at. The pipe doesn't have to slope much at all, no more than 6" in 100' (or a little over 1" for every 20 feet of pipe). Water will find it's way down hill. But you do need to have a place where the pipe can "daylight" and allow the water to drain away somewhere. Water won't run uphill, and you say you've got mostly clay, and clay won't absorb. You can probably use PVC pipe (at least 4" diameter) in the area outside the house footprint, but under the house you might want to use cast or ductile iron and connect the two with a flexible boot. The iron pipe is a better option for pipe where you know you'll never be able to get to it again. At the spring end, you'll need to wrap the end of the pipe with a screen and some filter fabric and attach both to the pipe with a large radiator hose type clamp. The screen and the fabric will help to keep the large and fine particles of the local soil from entering the pipe and eventually clogging it.
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