Groundwater
20 times more water is found below earth's surface than on it
Water seeps into the ground from the surface
Water seeps into the ground through permeable material. The water stops when it reaches an impermeable rock.
Water table
Top of saturated rock
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Higher when weather is rainy
Lower when weather is dry
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recharge
Discharge
Aquifer
a body of permeable rock that can contain or transmit groundwater.
Must have good Porosity
small spaces between grains
Must have good Permeability
connections between pores
Springs
Can be constant
Sometimes only flows at certain times of year
Where groundwater meets surface
Wells
Wells are good when water table is close to surface
Takes specialized equipment if the water table is too low
Created by digging to meet groundwater