Depth to the water table varies by location, but ranges from less than ten feet to a maximum of about 50 feet. The principle alluvial and glacial aquifers are capable of sustained well yields of 200 to more than 3,000 gallons per minute. Bedrock units produce ground water locally, but well yields are generally low. Bedrock aquifers are not classified as surficial aquifers in this study. Ground water generally moves from upland recharge areas near the aquifer perimeter, toward natural points of discharge along the rivers and tributary streams.
Water also moves vertically downward to recharge underlying regional aquifers.