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Groundwater

Groundwater. Water Underground. Water underground trickles down between particles of soil Permeable – substances that have large pores and allow water to easily move through the pores Example: sand and gravel Impermeable- substances with few or no pores for water to pass through

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Groundwater

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  1. Groundwater

  2. Water Underground • Water underground trickles down between particles of soil • Permeable – substances that have large pores and allow water to easily move through the pores • Example: sand and gravel • Impermeable- substances with few or no pores for water to pass through • Example: granite

  3. Water Zones • Water is introduced to the ground by precipitation • The top layer is filled with air and water so it is called the unsaturated zone. • As the water trickles down through the ground, eventually it will meet a layer where the pores in the ground are saturated. This is called the saturated zone.

  4. Water Zones • The top of the saturated zone is called the water table. • The water table can rise and fall depending on the amount and rate of precipitation. • Knowing the depth of the water table can tell you how far to dig to reach groundwater.

  5. Water Table • The water table can range from thousands of meters below the ground to being right at the surface. • Springs form when the water table reaches the surface causing groundwater to bubble or flow out of cracks in the ground.

  6. Aquifers • An underground layer of permeable rock or sediment that holds and allows water to flow through it • Are not an unlimited supply of freshwater • If people take water from the aquifer faster than it refills the level of the aquifer will drop.

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