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surface/ground water

tributary a smaller system that get to a bigger one.
water table the upper ground water .
ground water the water that is found under ground.
surface water the water that is found above ground.
watershed area of land that is drained by a river system
divide a ridge or area of higher ground that separates water shed
gradient a measure of the changein elavation over a creatin part of land
aqufier a giant under ground sponge ater wants to connect it.
porosity the storage space avalible in the aquifer
permeabilty the mesure of how easy water can flow throgh an aquifer