Well Drilled - Results

[Pettrix]

Going to measure the water well depth before they drop the pump in. Got a 300' long tape reel with a weight on the end. Will lower the tape into the hole until I can hear the weight hit the water. Will also attach a rope as a back up in case the tape breaks (doubtful) but always better to have a backup.

I want to see if the well depth is at 220 like the driller stated or if the level is lower or higher.

 

[Valveman]

I would like to learn more about the CSV installation and if it makes sense for my situation. I don't want to hijack this thread, where can I find some good information to get me started? Thanks.

Pettrix probably wouldn't mind if you ask questions here. But just in case you could start another thread to ask your questions.

 

[Pettrix]

I measured the well depth and I hit water at around 210 feet so the well driller report of 220 feet on static level was accurate. So with the well pump at 480 feet that should give me around 530 gallons of water storage in the well and about 95psi of water pressure at pump level.

 

[Pettrix]

I am going with 3HP - 13GPM Goulds Pump (4-20 range GPM capable). The setup:

1.25" SCH120 PVC 480 feet, stainless steel couplings at each 20' junction
2 torque arrestors (one at pump and one at midway in drop pipe)
2-3 brass checkvalves
brass 7" pitless adapter
Frost free connection at well area
Brass hose bib
10 Gauge - 3 wire - double insulated wire for pump (480 feet)

 

[check]

Well, I can't believe that your static level is 210 feet. My well is 400 feet deep, and my static level is 20 feet!

 

[Valveman]

Do you know how much the well can produce from 470'? Since the static is at 220' and you are setting the pump at 480', it makes me think it is a low producing well. From 220' to 470' there is about 375 gallons stored in the well. So if you do any watering outside, a 13 GPM pump can pump the well dry in 28 minutes. You may want to use a cistern and booster pump so you can irrigate for longer periods of time.

If there is no irrigation, that should be plenty for the house.

Good luck with the VFD and the three phase motor. You know you will have to change out the wire and the motor when you decide to go back to a dependable single phase motor and controls?

 

[Pettrix]

Do you know how much the well can produce from 470'? Since the static is at 220' and you are setting the pump at 480', it makes me think it is a low producing well. From 220' to 470' there is about 375 gallons stored in the well. So if you do any watering outside, a 13 GPM pump can pump the well dry in 28 minutes. You may want to use a cistern and booster pump so you can irrigate for longer periods of time.

Conservative estimate tests done when drilling showed 20GPM at 470'

From 220 to 470, there would be 490 gallons of water stored in the well
Well Volume Calculator - Hydro-Terra Group

 

[Valveman]

Conservative estimate tests done when drilling showed 20GPM at 470'

From 220 to 470, there would be 490 gallons of water stored in the well
Well Volume Calculator - Hydro-Terra Group

That is a cool calculator. I always just use 1.5 gallons per foot as a rule of thumb, which is 375 gallons. But that calculator shows 381 gallons with 6" casing and only 169 gallons with 4" casing. If you have a 6.5" hole with 4.5" casing, the gallons would be in the middle somewhere.

If he was blowing 20 GPM from 470', I will bet that your pumping level at 20 GPM will be much higher than 470', and a smaller pump would work. But without a well test you will have to find out for yourself what the pumping level really is. Then maybe when you switch the pump out you can go with a smaller pump, then maybe the wire will be large enough for a single phase motor.

I would run a little air line down the well with the wire, so I could air it up and see what the static and pumping levels really are.

 

[Pettrix]

That is a cool calculator. I always just use 1.5 gallons per foot as a rule of thumb, which is 375 gallons. But that calculator shows 381 gallons with 6" casing and only 169 gallons with 4" casing. If you have a 6.5" hole with 4.5" casing, the gallons would be in the middle somewhere.

If he was blowing 20 GPM from 470', I will bet that your pumping level at 20 GPM will be much higher than 470', and a smaller pump would work. But without a well test you will have to find out for yourself what the pumping level really is. Then maybe when you switch the pump out you can go with a smaller pump, then maybe the wire will be large enough for a single phase motor.

I would run a little air line down the well with the wire, so I could air it up and see what the static and pumping levels really are.

Which number are you looking at in the online calculator? I am going by the "standard sampling purge volume in gallons"

What does adding air into the well do to the static water level and pumping levels?

 

[Valveman]

Which number are you looking at in the online calculator? I am going by the "standard sampling purge volume in gallons"

What does adding air into the well do to the static water level and pumping levels?

I don't know what that "purge volume" stuff is all about. If the actual volume of the well is 380 gallons, I guess that means you have to pump it out about 3 times to purge? I don't know. But if the well only holds 380 gallons you can only pump 380 gallons at a time, plus whatever the inflow to the well is (recovery rate).

Blowing the well with air can give you a good estimate on how much the well will produce, but you can't really tell the pumping level of the water. Only a pump test can do that. You can blow a well from 470' and get 20 GPM. But when you use a pump, you many get 20 GPM without pulling the well down very far. So when pumping 20 GPM, if the water level only pulls done to say 300', then 300' is all the pump will see, which means you could use a much smaller pump than when pumping from 470'.

The air line I was talking about it just to check the water level while you are pumping 20 GPM. A small tube, open ended at the 470' mark, and attached up top to a tee with a pressure gauge and a Schrader valve to hook to a compressor, can give you an accurate pumping level. A small compressor blows the air out of the tube. Then for ever PSI shown on the gauge, you have 2.31' of water above the 470' mark. So an air pressure gauge reading of 50 PSI would mean a water level of 355'. See this picture.