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Watersheds

7.8C Watersheds

TermDefinition
WATERSHED Area of land where surface water & groundwater drain into a particular body of water separated from each other by drainage divides.
DRAINAGE DIVIDE Geographical barrier, such as a ridge, hill, or mountain, separating 1 watershed land area from another.
SURFACE WATER Water from precipitation that drains into a gully that flows into a stream, which then flows into a river, lake, reservoir, estuary, wetland, or ocean.
GROUNDWATER Water that collects in cracks & pores in underground soil & rock layers.
WATER TABLE Top of the saturation zone, below which water fills all open spaces between the rock.
SATURATION ZONE Below the water table where all spaces not filled with solid material fill with water.
AQUIFER Layer of permeable rock that allows water to flow through.
PERMEABLE ROCK Allows water movement to flow through the material; opposite of impermeable.
SUBSIDENCE Sunken land surface due to underlying compression of earth material as a result of the removal of groundwater.
POINT SOURCE WATER POLLUTION Single identifiable & localized source of water pollution, such as waste-water discharge into a stream.
NON-POINT SOURCE WATER POLLUTION Pollutants introduced into surface or groundwater that are without a specific location source, such as water flowing over a lawn that has been fertilized & then into a drain.
PERCOLATION Downward movement of water through soil & rock due to gravity.
IMPERMEABLE ROCK Rock that does not allow liquid to flow through it.
Created by: trauberk
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