Shallow Well Pressure Fluctuation

NickAAAJuly 15, 2012

I installed a shallow well about a month ago and I am having a problem with pressure fluctuation. Originally I drove the well point 20 feet below my pump, which put the top of the screen 4 feet below the static water level. When I ran the pump for the first time all seemed well. However, after a day or two of running sprinklers the running pressure would fluctuate from 30psi down to 0psi. Cycling from 30-0psi every 5-10 seconds.

Based on the pressure cycling, I assumed I drove the well point partially through the water bearing layer (I don't know how thick the aquifer is). So I removed a 2 foot section of vertical pipe, in turn raising the well point 2 feet. Hoping that this would put the well screen completely in the aquifer.

I then ran sprinklers non stop for 5 hours with no pressure drop and came to the conclusion that I fixed the problem. However, a few days later i was having the same problem.

I'm getting about 5gpm at 30psi.

My setup is as follows: (see picture)

A stainless steel well point/screen 1 1/4"x4' with the top of the screen 2' below static water level. No casing. The well point is plumbed to a Goulds J10S 1hp jet pump with 1 1/4" galv pipe and drive couplings with a check valve about 5" from the pump.

I have a 4.5 gallon goulds hydropro pressure tank (set 2psi below the pump cut in pressure) on top of the pump.

After the tank I ran 1" pvc to two sillcocks outside the house.

A few things I can think of causing my pressure fluctuation.

1. Well point is driven through water bearing layer and sucking air from below.

2. Water level is drawing down around well point and sucking air from above.

3. 1 1/4" x 4' well point does not allow enough water to pass through (not likely because I had 5 hrs of continuous 30psi).

Do I put in another well point and connect the two with a manifold?

I don't know what to try next. Please help.

Thank you for reporting this comment. Undo

I'd say you've sucked out the water from the immediate vicinity of your well and water isn't flowing through your aquifer fast enough to keep up with your demand rate.
You probably need either more well or less demand.

    Bookmark   July 15, 2012 at 10:12PM
Sign Up to comment
More Discussions
Fed up and ready to tackle my well water issues
I've been reading posts trying to educate myself for...
Salt-free water conditioning
Hi all, Considering installing a water softener in...
what brand water softener
have 2400 sq ft rancher on town water. do not have...
Do Electric water heaters from plumbing supply differ from home depot
Plumbers I feel rip people off when installing electric...
Help with smelly well water
Just a little background. We bought a house 3 years...
Sponsored Products
Brushed Steel Floor Lamp: Luella 58 in. Floor Lamp 20119BS
Home Depot
A19 Lighting | Maui Wall Sconce
$147.99 | YLighting
Sea Gull Lighting Wall Mounted Piedmont Wall-Mount 2-Light Outdoor Olde Iron
Home Depot
Plec Wall Sconce by Estiluz
$603.00 | Lumens
Denby Jet Cast Iron Shallow Casserole - CIJ-581
$186.00 | Hayneedle
5" IC Shallow Remodel Housing by Juno
$43.52 | Lumens
Coastal Shallow Egyptian Cotton Towel Set
$34.99 | zulily
Sonneman Perno Polished Nickel Swing Arm Desk Lamp
Euro Style Lighting
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™