Gosh abrandt, it doesn't look like anyone knows the answer to your question. I'm sure not an athority, but I'll tell you my observations in a couple places. While on trips to Nebraska, I've seen well heads with a steady stream running out of them even when the pump is not running. The wells are in low spots on the property and the pressure from the water table on the higher ground makes the water flow below. Many times near rivers you will see excavated areas that are holding water. The water level usuall rises or falls acording to the river depth.

So,I guess the results are not always the same. I would visit with someone from the NRCS. Farmers in your area may shed a little light on the subject also.