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day18 #543491 01/27/22 09:28 PM
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Can you define crazy expensive? Just looking at ball park? I found a well in that data not far from me that Is at the 400 foot depth that is getting 130 gpm.

Dia. (in.)
165
210
250
290
350
400
6 N PVC CASING 0 400 40
4 N PVC LINER 395 400 40
4 N PVC SCREEN 400 460

day18 #543495 01/28/22 08:49 AM
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Now is the time to contact a local well driller and get some estimates.

You need site-specific information. The costs for drilling and casing a water well depend to some degree on the local geology. The Covid supply chain disruptions may have also raised costs.

I have some equipment that is shut in - due to the lack of a gasket!

day18 #543496 01/28/22 10:52 AM
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Sorry, yesterday was a busy day.

Yes, I calculated the water requirements on an Evapotranspiration Rate for August for that location (Houston). day18, what you need and what you get could be two different things. All areas of the country cannot produce the same amount of water from a well, only a well driller in your area will know for sure.

For instance, Dave Davidson, one of the moderators here can only get (I believe) 1 gpm or 1/10 gpm from his well. So, even for his house he has to pump continually into an above ground storage tank just to have enough water for the house. No way could he use a well to fill the pond. Here where I am at in Northern Indiana, we have a very good aquafier here only 100 feet down. If I care to pay for the electricity, I can pump 2,000 gpm if I dig a big enough well.

I just went over last months utility bill. Our electric costs (Kwh rate, delivery charge, taxes, etc) cost us now $0.239/Kwh. The next county over, that electric rate is $0.209/Kwh. (different utility company)

As for what pump size, that is a big "that depends" question. Even if you wanted to pump 25 gpm, all well pumps are not the same. You have high efficiency pumps and not high efficiency pumps. In other words you could possibly pump the same amount of water with a 2hp pump or a 5 hp pump.

Chris: Here's what the numbers are that I calculated:
If all water loss is from Evapotranspiration, then this is applicable for August (for an average year in Houston).
325,851 (gallons in an Ac/ft of water) ÷ 12 (inches) = 27,154 (gallons per inch) x 4 (inches per month Evapotranspiration Rate loss) = 108,617 (gallons per month per surface acre loss) x 8 (surface acres) = 868,936 ÷ 30 (average days per month) = 28,964 (gallons per day) ÷ 24 (hours in a day) = 1,206 (gallons per hour) ÷ 60 (minutes) = 20.1 gpm if run 24/7.

Data acquired from http://hgciatx.com/water-management/

I have heard that you cannot get more than 100 gpm from a 4" well casing. You will have to talk to your local well driller to get the generalities for a well in your area, and even at that they cannot guarantee how many GPM your well will produce, they can only give you a very educated guess before the actual well is drilled.

To help increase the life of the well, I would recommend putting a double screen on it, AND use stainless steel screen vs. plastic if possible. A double screen will give you twice the amount of screen to pull water through, so that gives you twice the surface area to resist plugging up. A stainless screen can be made with more open area to allow more water to flow through it, so that also increases the efficiency of the well. YES, the stainless screen costs more, but when you look at what the cost of the well is, and what it will cost to replace the screen if it gets plugged, I believe that the stainless screen is cheap in comparison.


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day18 #543497 01/28/22 10:57 AM
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Man great information. Thank you for taking the time!! I really really appreciate it. I will call some well companies to get their thoughts.

day18 #543505 01/28/22 12:40 PM
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Spoke to a few people in the area. A 4inch pipe with 5 HP will get you about 90 GPM. I think that would be sufficient for what I need. I really appreciate all the help.

1 member likes this: esshup
day18 #543598 02/01/22 06:46 PM
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Yep, my well, when drilled, produced 1/10 gpm. But, it does it 24 hours per day. And, I pump it into a 2,500 gallon (I think) above ground container. Then, on to the house 100 yds away. We hit water at 40 ft but drilled down another 50 ft.

I once asked Lusk how long it took for rain water to get down that far from the surface. I THINK he said a couple of days.

Last edited by Dave Davidson1; 02/01/22 06:51 PM.

It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP
day18 #543619 02/02/22 06:14 AM
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I have drilled several wells that fed various ponds. Currently my 2 acre pond has a well that was around 300 feet with strong water. My well guy put in a 3.5 horse pump that does around 35 GPM and it keeps my pond level during the summer when our spring is not running.

I would rely on your well guy - as a side note when my well is pumping 24/7 the electric bill takes a noticeable jump.

Good luck

day18 #543742 02/04/22 08:06 AM
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Thanks y’all will keep you updated on progress.

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