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Groundwater Movement

Groundwater Movement
Reading Level
     edHelper's suggested reading level:   high interest, readability grades 6 to 7
     Flesch-Kincaid grade level:   5.66

Vocabulary
     challenging words:    man-made, shale, trapped, advantage, material, layer, groundwater, soil, pump, pores, easily, wells, pressure, however, such, source

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Groundwater Movement
By Patti Hutchison 		  
1     Did you know that most of the earth's fresh water comes from under the ground? Many of us drink and bathe in groundwater. Just as surface water moves, so does groundwater. However, groundwater moves in a much different way.
 
2     Groundwater flows downhill following the slope of the water table. But unlike streams and rivers, it flows very slowly. The speed of surface water is often measured in feet per minute. But the flow of ground water may be measured in feet per day. It can take many years for groundwater to move from one area to another.
 
3     The speed of groundwater movement depends on the permeability of the material it is moving through. Materials with large pores allow groundwater to move rather quickly. These materials include sand and gravel. They have large connected pores. Ground water can move through these materials at a rate of one meter per hour in places.

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