I have a 375' deep well for my rural home. I presume there's no way to know
how much water is in the well. Last summer, which was very hot, I stupidly
ran the well dry trying to water a new lawn. With all the modern technology
we have- it would be nice if I had a gauge in my kitchen to tell me how much
water is in that well. I don't know how this would be engineered, but I can
imagine it's not that tough an engineering problem- if the well companies
wanted to install some kind of measuring device- and I don't see how it
should add all that much cost to the well.
In answer to your subject question. There's a way to figure out how much
water you have in a well. You need to know 3 things and you already know
one of them, the depth of the well. The others are; how far down to the
water level and, the diameter of the casing. Example, 6" dia and 50' to
the water. A 6" well has 1.47 gal per foot of water so, 375-50325*1.47G7.75 gallons. I have a chart for various diameters.
That doesn't answer your question but we're half way there. If you know
how deep the pump is set, with the above info you then can determine how
much of the water in the well is usable. But then as you use water the
well 'recovers', meaning water runs into it as you take water out of it.
So... you'd need a pump test of the well (4-8 hours minimum) to get an
idea of how long you could pump water until you ran out or didn't want
to use anymore but you shouldn't run out. Problem is all wells change
and the change is more the more water you use. BTW, that's a change for
the worse, the recovery rate will usually decrease. And now we get to
the other part, how do you know when you should stop using water so the
well doesn't go dry, or really, the pump sucks air. Well there's a
number of ways to do that. You can simply change your pressure switch to
a low pressure safety cut off type. Meaning the pressure falls to 20 psi
and the switch opens shutting off the pump until you rest it. Roughly
$25 anywhere you buy pressure switches.
As to some sort of alarm when you're getting close to being out of
water, sensors can be had but, I'm not sure they don't have to be wired
separately from the pump cable. So if you don't have a means to provide
them power due to the cable being buried without a conduit or way to get
the wire out of a conduit and down the well, do you want one enough to
dig up the yard? Driller supply houses can explain all this in more
detail and provide you with what you want, it just won't be a gauge at
the sink from what I know, it would be an multiple stage audio and/or
Quality Water Associates
You would think in this day and age of technology they would have a
pressure sensor mounted just above the submersible pump that would
measure head and take in account well size(6"-8" etc.), then convert
to gallons with a digital read out in the home. This is actually quite
simple to do.
O.K. Gary it's my idea you market it and we'll be partners.
Ok, but I we have a design change (already!). I go for a wireless sensor
floating on the water in the well programed to the pump depth with the
signal sent to a receiver we can make into a 'fridge magnet display and
we're done. I'll do the sensor and you do the receiver. It should be a
Quality Water Associates
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