Aquifier - an area of permeable rock underground that holds or transmits groundwater , drainage division - a geographical barrier such as a ridge, hill, or mountain separating one watershed land area from another, Groundwater - water that collects in cracks and pores in underground soil and rock layers, non point source water pollution - pollutants into the surface water or groundwater that are without a specific source location, such as water flowing over a lawn that has been fertilized, permeable rock - rock or rocky material that water can flow through, Point source water pollution - A single identifiable and localized source of water pollution, such as waste water discharge into a stream, Saturation zone - area below the water table where all spaces not filled with solid material fill with water, Subsidence - sinking of land surface due to underlying compression of earth material as a result of the removal of groundwater , Water table - The top of the saturation zone, below which water fills all open spaces within the rock , water shed - an area of land where the surface water and groundwater drain into a particular body of water separated from other water sheds by drainage systems, porosity - the amount of space between the material,

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