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well question- gpm problem, answers needed asap

Posted by beaglesdoitbetter (My Page) on
Wed, Jul 27, 11 at 21:54

I am cross posting this to the building forum and kitchen forum because we need an answer for our builder tomorrow morning so the well people can either leave or not.

We have dug down to 525 ft. and we are still only at 4 gallons per minute. Our builder is suggesting we stop. Everyone else that I have talked to says 4 GPM is not sufficient.

Anyone on here have a well that has such a low GPM or anyone have any info on why that will or will NOT be OK. We've already doubled our well allowance and our builder has no indication of if we will find more if we go further or how much further we would need to go. Our house is on top of a mountain.

If it makes any difference to anyone's answers, we have a 75 gallon hot water heater and a 50 gallon hot water heater, but we also have a big tub and multiple shower heads.

Thanks for the help again!


Follow-Up Postings:

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RE: well question- gpm problem, answers needed asap

4 gpm may not be sufficient to properly regenerate a water softener if you plan on one. Unless you have a rare well there should be aspects of your water you will want to treat.

Hopefully a plumber will chime in but "... a 75 gallon hot water heater and a 50 gallon hot water heater, but we also have a big tub and multiple shower heads" seems pretty demanding for only 4 gpm.


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RE: well question- gpm problem, answers needed asap

A well 6" diameter holds about 1 1/2 gallons of water per vertical foot. Subtract from 525 the static level of the water and subtract the distance from the bottom at which the pump will be placed for the usable depth of water. Multiply by 1.5. Let's say it is 445 feet x 1.5 for 667.5 gallons. That much is available without any additional inflow. and in the hour that it takes to pump that out, 240 gallons more will inflow. The average household uses about 200 gallons per day. And 4 gallons per minute is 5,760 gallons per day. Yes, I think your supply is quite adequate.


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RE: well question- gpm problem, answers needed asap

Install a large pressure tank - 4 gpm is perfectly adequate.


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RE: well question- gpm problem, answers needed asap

Thanks everyone!


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