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Old 03-19-2016, 08:56 PM   #16
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Re: Sump water level

I'm thinking that somebody thinks you need air behind water for it to flow (like holding your finger over the end of a straw full of water) but drain lines are (hopefully) never completely full of water - the air space at the top of the lines will prevent any suction.
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Old 03-19-2016, 10:51 PM   #17
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Re: Sump water level

Daniel -
I also have never understood the concept of an "air cavity/pocket or bubble". It seems like it is a canned or excuse.

pnorman55 -
My experiences - For residential basements, I feel it is best to install the rigid PVC drain tile with the bottom of the pipe below the bottom of the footing with 2" of well drained aggregate under it (the cheaper, lazier alternative of slotted corrugated pipe can work if done properly).

This applies to either interior or exterior drain tile, but I know of builders that automatically used both interior and exterior PVC tile and linked them together for insurance plus no problems with walls moving, cracking or settling because of saturated exterior soil pressures. In addition, it also minimizes the water leakage from any floor cracks or movement of the saturated soil under the slab.

Keep in mind that a basement is the lowest point of your home and can be subject to constant moisture in most areas. Moisture below ground is not like turning a faucet on or off. It is a relatively constant item, but can vary daily, monthly or yearly and must accounted for when building and altering.

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Old 03-20-2016, 06:48 AM   #18
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Re: Sump water level

No air pocket is the same way of saying that the ground under the house, including the perimeter drain trench and drain tile inside, is continuously saturated/filled with water. The varying porosity of the soil may or may not result in capillary action holding water above basement floor level even though the water level in the sump is below floor level. Some seepage can result through the joint between floor slab and foundation wall where the basement interior acts as an air pocket.

I am not sure whether the term hydrostatic pressure can be used to describe quantitatively when or if this kind of basement flooding under these conditions might occur.

In summer in most locations, the ground temperature averages many degrees below outside air temperature. This results in a higher humidity of the air in the basement compared with the air upstairs given reasonable air exchange between interior and exterior. Sometimes the air has a starting relative humidity high enought that when the air is cooled by the foundation walls, water condenses out.

You may not excavate below the level of the bottoms of the footings all along the foundation for the purpose of installing new drain tiles or for any other reason otherwise the foundation may collapse. But you can get away with digging a trench less than a foot wide crossing under the foundation footing, say, for the purpose of interconnecting exterior drain tiles with interior drain tiles.
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Last edited by AllanJ; 03-20-2016 at 07:04 AM.
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Old 03-21-2016, 12:16 PM   #19
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Re: Sump water level

You can always adjust the float on your pump.
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