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Old 03-18-2010, 08:15 AM
 
Location: S. New Hampshire
909 posts, read 3,363,413 times
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If you have a sump pump in your house, does that mean you also have french drains? Is it possible to have a sump pump but no french drains? And if so, is the sump pit just a hole in your basement? How does the water get diverted to the sump pit?

We have a sump pump/pit, but can't tell whether or not we have french drains.
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Old 03-18-2010, 08:18 AM
 
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French drains are basically gaps between the walls of the basement and the floor...so if water drips down the wall it can get under the slab and get sucked up by the sump pump (hopefully). You can see if you have them...

Someone correct me if I'm wrong on this...
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Old 03-18-2010, 09:03 AM
 
Location: Londonderry, NH
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Check to see if the sump pump well is sitting on dirt or gravel. If gravel it is probably draining the soil under your slab. If dirt, not so likely.

French drains (perforated pipe set in gravel and sloped to a drain away from the foundation) can be installed outside the foundation during construction (the right way) or dug inside the foundation later to relieve a water problem (the wrong and expensive way). If there is a strip of gravel next to the foundation walls you may have interior drains. They may connect to the sump pump, or they may not.

In any case remember, in New Hampshire, and most of New England, a dug basement is a huge well you desperately try to keep the water OUT of.
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