1Groundwater1Questions 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 Cycle3
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2Groundwater•Water from rain can…– Runoff– EvaporateInfiltrate4–•Water that infiltrates feeds the groundwater system•groundwater = 22% of world’s supply of freshwater522% 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