Controlling Water in basement
I'm building a house with a walk out basement. I've got the basement walls up and have a small spring in the hillside on the uphill side of the basement. I was planning on putting in a footing drain with drain rock and waterproofing the basement walls with a membrane and a dimple sheet. There is no water inside the foundation. The water is coming our of the cut about 2 feet over the top of the foundation. The water flow is only a trickle now but I'm worried about heavier flows in the winter.
Should I consider other water control metods? I could put in a french drain uphill from the house, but I would need a 8-10 foot deep cut to get to the level of the flow. I have also considered digging a shallow hole at the base of the spring and putting in a secondary drain below the foundation drian.
How is the best way to handle this?
Not an expert, but I believe you will have to dig down and hopefully get to the source level and redirect the water. I would not route the spring directly under the foundation. Will you have a sump or I would double up the recommended drain tile under the floor. I recommend you call in a pro either an excavator, a water proofing specialist or possibly even someone who installs septic systems to see the condition first hand and let them tell you what they would do. Your house is only as good as the foundation and water will damage it.
In all fairness to contractors, when shopping for advice, one of them would get the job and I'd get a warrantee.
If water is coming out of a hillside, you should assume there is more water below. You can intecept the visual water, but who knows - it all depends on the soil types.
Also, you have to worry about future land use and developments. Future changes can easily direct more water toward your basement.
Because of the existance of water above and the fact that you are just starting, consider adding drain tile inside the footing (below the slab) since the cost is minimal now and the value could be great later. You can always intercept water, but it can saturate the lower soils and accumulate under the slab. This can cause floor cracking/leakage and the classic leaking at the interior wall/floor joint.
I have a builder friend that build every home (2000 -7000) with dual drain tile and never had a wet basement complaint - he thought life was too shrt for skimping. His exterior wall waterproofing was the minimal asphalt (or similar) and heavy poly.
The interior drain tile also can take care of the water that can accumulate from the utility trenches and the acess ramps that are usually dug during construction.
Thanks for the reply's.
Code requires a footing drain at the base of the footing covered by 1.5 feet of drain rock. This will run to daylight on the downhill side of the house.
If I do a secondary drain I was planning on digging a small pit below the spring and then running a second drain out around the footing. My concern is to keep the water away from the footing and having plenty of drain cross section to handle more flow. I would not run this under the foundation.
Luckily I threw an extra sleve under the foundation that I can use to drain an internal drain. If I go this route, how level does this drain need to be. Can I just dig a small trench inside the uphill foundation and then run it to the down hill side? Do I need to have any slope?
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