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Old 08-27-2005, 08:46 PM   #1
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drainage question


We need a little advice. A couple of years ago we had an addittion built onto our home. It included a basement. When they were excavating for the basement they ran into a overwhelming large rock table. Thus our basement could not be dug as deep as we wanted. The contractors also noticed water constantly seeping around the area and told us it was either a natural spring or water from a broken line. We had the water tested and it was not city water. We do live at one of the lower areas in our city with a lot of run off. Anyway they laid our basement and put in drain tile leading to our sump. At first we had to keep buying bigger pumps because the smaller ones could not keep up. Several times we had to pull up carpet. Even when it hasn't rained in a while our pump still pumps out at least 1000 gallons a day (thats what my husband says)I know the sump seems to come on atleast every hour on a dry day. My husband now wants to dig up the outside drain tile and lead it somewhere else. Our yard is pretty level to the point we had to lead our sump pump drain underground out our yard and to and underground pit. Any suggestions on taking some of the water away. I know I have read about daylighting your drain tile but I am not sure what that means.

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Old 08-30-2005, 07:22 AM   #2
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drainage question


'Daylighting' means you run a pipe continuosly on a downward slope (naturally draining by gravity) from the water's source to the point that the pipe is no longer buried (where it comes out of the ground 'to daylight'). The depth of the pipe under your basement and the terrain around your home (how level or sloped it is) will determine how far the pipe has to go to before it reaches 'daylight'. In your case you'd want to use no less than an 1/8 of a foot of downward slope along each foot of pipe.
It's usually impossible to daylight foundation drains from basements when a lot is flat. If the lot doesn't slope significantly away from the house, in one direction or another, you'll need to consider another alternative. Underground pits may or may not be an effective means of eliminating the water. A geotechnical firm can tell you if the soil in your locale is suited to absorbing the additional runoff from your basement. If it isn't you might make the problem worse by exposing yourself to an even larger source of water.

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Old 08-30-2005, 11:44 PM   #3
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drainage question


I have a feeling you might be recirculating the water from the the pit back to the house back to the pit. If you have good drainage in your street I would try pumping into the street for a few days and see if there is any difference. Pumping into the municipal sewer system would be a no no but if you were going to do it as a controlled test for a day or two I don't think anyone would get to upset about it or you could try to get permission. That's my opinion and I've corrected a fair amount of drainage issues. HS.
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