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Chapter 15 Vocabulary First half

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Surface runoff
Water that flows over land until it reaches lakes, rivers, or other areas such as oceans.
Reliable runoff
The amount of surface runoff that we can generally count on as a source of freshwater from year to year.
Watershed
A ridge of land that separates two adjacent river systems.
Groundwater
Water that fills the cracks and spaces in underground soil and rock layers.
Zone of saturation
The lower zone where water accumilates between small rock particles.
Zone of aeration
The upper zone which usually isn't completely filled with water, but with rocks and soil too.
Water table
Underground surface below which the ground is wholly saturated with water or the upper layer of the saturated zone.
Aquifers
Subterranean, porous, water-holding rocks that provide millions of wells with steady flows of water.
Recharge
New water that enters the aquifer from the surface.