13_Groundwater[1]

13_Groundwater[1] - Groundwater 1 Questions to ponder Where...

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1 Groundwater 1 Questions to ponder Where does groundwater come from? Which characteristics of geologic material allow it to hold and transmit water? 2 Why is groundwater so important yet so fragile of a resource? What threatens our groundwater supply? Hydrologic Cycle 3
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2 Groundwater Water from rain can… – Runoff – Evaporate Infiltrate 4 Water that infiltrates feeds the groundwater system groundwater = 22% of world’s supply of freshwater 5 22% of our freshwater supply comes from 1% of the Earth’s water budget! Infiltration = GW RECHARGE – Gravity is primary driving force • Pulls water down into soil, sediments and rock – Water enters the system at recharge zones Infiltrates ground surface 6 • precipitation, wetlands, lakes and streams – Leaves the system at discharge zones springs, seeps, • wetlands, lakes and streams
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