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Old 03-09-2011, 11:44 AM   #1
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sump pump well/pit construction

I have a sump that sits on the floor and shuts off when water level gets down to 1/4 inch.... Works well for my needs in an unfinished large basement that has flooded only twice in 20 years, from a rising water table. Cleaning up that 1/4 inch is a real pain however.
Should I dig out a pump well through the slab or only chip out a depression for my pump. If I need to construct a deep well or pit, should it be cement lined or pouris to the gravel under my slab allowing water into the pump prior to entering the basement.
Any thoughts are appreciated..


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Old 03-09-2011, 11:58 AM   #2
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If the sump sits on the floor and can be emptied down to 1/4 inch then (theoretically) the pump can never bring the level of water flooding the basement down below 1/4 inch.

A pit dug below floor level should have holes to let water up into it. The sides of the pit cannot be bare dirt or gravel but you can use a plastic liner surrounded by gravel or have brick or concrete block or poured concrete sides. If you have a layer of not so fine gravel under the basement floor slab, you might not need to install collector pipes (a French drain) under the floor requiring digging of trenches.


The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.

Last edited by AllanJ; 03-09-2011 at 12:04 PM.
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