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Water Table
The top of the zone of saturation where it meets the zone of aeration.
Aquifer
A layer of porous earth materials that stores and transmits water.
Aquiclude
A layer of impermeable earth material that prevents the movement of water through it. 
Artesian Well
The flow to the surface of pressurized water trapped in an aquifer between aquicludes
Cone of Depression
The lowered level of the water table around  an active well (The cumulative affect of pumping over a larger area it is known as draw down)
Subsidence
The sinking of land due to the removal of water from the ground below. 
Recharge zone
Area in which rain and surface water percolate down into an aquifer

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