Springs occur where an aquifer intersects the surface. A perched water table sits above an aquaclude that overlies another water table. This groundwater geometry underlays much of the delmarva peninsula, florida and the rest of the atlantic seaboard. Rapid pumping water cans tart coning from above and below resulting is salt water intrusion. Recharge area: where infiltration of the aquifer occurs. Deformation of the black hills uplifted the western end. Recharge in the black hills fills a gigantic aquifer system. Decline of the water table in high plains aquifer as a result of agricultural use of groundwater. Decline of lake level in florida due to pumping of groundwater from the florida aquifer. Groundwater removal leaves open pore space in previously saturated material. Compaction of the newly formed pores can lead to land subsidence, ground fracturing, etc. The ground starts to shrink and create fissures.