Water pressure/volume via well

[turnkey4099]

</font><font color="blue" class="small">( Do these tidbits help?

I just got my well drillers report that they filed with the state.

Total Depth 310 feet
Static Level 104 feet
Total yield 100 gpm
Pump Intake at 220 feet
HP ¾
Rated Yield 10 gpm

Just as a “fyi”,

0-49 feet = soil
49-62 feet = limestone
62-63 feet = void
63-310 = limestone

They installed 76’ of 6" casing


Does the static level of 104’ mean I have 116’ of water ABOVE my pump intake as a reserve before even counting the fact that it’s 100 gpm?? Is the static level of 104’ the same as the “head”?
)</font>

Note that the figures are measured from the top of the well.

Yes. The 'static level' is that height the water will stand in the pipe with no draw. In your case with 100 gpm flow/recovery the static level should never vary. You aren't going to begin to approach that amount of draw.

The 'head' is the height of the water column -above the pump- (116ft). It can also refer to the height you have to raise the water to the point of use. In that case the head is measured from the top of the water column to point of use.

Harry K

 

[dmccarty]

turnkey4099,

</font><font color="blue" class="small">( Total yield 100 gpm
Rated Yield 10 gpm )</font>

What is the difference between Total yield and Rated Yield?

My well is something like 223 feet deep with the static level within a few feet of grade. The well was rated at something like 15gpm. Best I can tell, the pump can only push 5gpm. I assume(word used on purpose /forums/images/graemlins/grin.gif) that I can't run the well dry with those rates. Is that a good assumption?

One thing I sure would like is a gauge to tell me the static level of the well. I would like to know if/how much the level fluctuates. Is there such a device that I could put in?

Later,
Dan

 

[ByronBob]

Dan,

Yes your correct. The pump can push 5GPM and your well fills 15GPM. Your water level will never move in the well head at that rate. If your pump did 16GPM and the fill rate is 15, your well would drop 1 foot a minute until your head was used up.

Again like Richard, you'll never do that so your assumption is right. /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

 

[Richard]

whoo hoo, so we BOTH can use "that word" on purpose now?

/forums/images/graemlins/shocked.gif

 

[dmccarty]

Richard,

I think we are now in a select group! /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

Thanks BB!

Later,
Dan

 

[Highbeam]

"Yes your correct. The pump can push 5GPM and your well fills 15GPM. Your water level will never move in the well head at that rate. If your pump did 16GPM and the fill rate is 15, your well would drop 1 foot a minute until your head was used up."

Going to have to disagree. You won't be able to drain a well that can produce 15 gpm with a 5 gpm pump but the water level in the casing will not stay the same throughout the whole mess. It will fall and then hold steady at something lower than the static level while the pump is running.

There is a sneaky way to measure the water level on a continuous basis You insert a tube all the way to the bottom of the well or the top of the pump. Pump air into the tube until the pressure stops going up. That amount of air pressure can be used to calculate the distance between the tube end and the water surface. Put a gauge on the tube and you will always be able to read the distance between the surface of the water and the bottom of the pipe. You will need to be able to add air on occasion for an accurate measurement. I'm sure there's a name for this system.

 

[GaryQWA]

Yes you have 116' of water at the rate of 1.47gal/ft, or 170.52 gallons in storage. You have a recovery rate of 100 gpm. Your well will never go 'dry' with those figures.

The 'head' depends on how you size or where you set the pump but no, 104' is only part of it. You must go to the highest elevation of the higest fixture from the expected water level in the well or the pump inlet depth. The best for a rock bore is the pump inlet which allows full use of the stored water in the well and unless drought causes the water level to fall to the inlet, you won't have a dry well condition when others in the neighborhood will if their pump is sized at the static water level minus say 100', or the pumping level of the well.

BTW, you never want a softener etc. installed between a submersible pump and its pressure switch. Submersible pumps build hundreds of lbs of pressure which will break most things if the pressure is blocked and the switch can't sense it to shut the pump off.

The rated yield of 10 gpm is for the 3/4 hp pump. You have to look at the pump curve chart for the make and model of your pump to see what gpm it will deliver to whatever height/head. Head is the sum of all pressure losses of the plumbing and fittings in the system plus the maximum pressure used.

This pump curve chart shows 10 gpm at various depths and the hp needed to provide that from various depths.

Gary Slusser