Expert opinions needed for this problem

[Ennismj]

About a year ago we had a well drilled 180' with a 20' steel casing and 10 gallons per minute. The property is in a northern state, with the "well" 80' uphill from a lake that is 20k acres. The lake is lowered in the fall to handle winter run off. The design called for 1" polyethelene pitched back to the well with a self draining valve just below the pitless. During winter use the system would be charged then shut down and drained back into the well. The static water level is about 1-2' below the pitless and the auto drain valve just below it. This past weekend we experienced heavy rains and for some reason the water level in the well came up to the pitless adapter yet the water table and lake level is well below where the well is.

What caused the water level to rise in the well? Shouldn't it have remained static? Do I have a leak somewhere?

I am at a loss as to what is going on so any help would be appreciated.

 

[Cacher_Chick]

What evidence do you have that the water table has not risen?

 

[Sponsor]

 

[Ennismj]

Water table

No doubt the water table did rise after the heavy rains.

Do you think the heavy rains could have caused an increase in hydrostatic pressure on the aquifer causing an increase in the static water level in the well? Can this happen?

 

[Gary Slusser]

When the well is drilled into bed rock, a rock bore well which is what you have, the water table always fluctuates with precipitation levels. And if you pump out more than 10 gpm, the water will be drawn down and then recover when you stop using water.