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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3 At some point in depth, all rocks and/or soil become completely saturated with water 7 Water Table Unsaturated zone Saturated zone The Water Table • Water is found at some depth everywhere beneath the Earth’s surface • The water table defines the boundary below which all pore spaces are filled with water 8 – it is between the zone of aeration (unsaturated) and zone of saturation (saturated) • Usable water is restricted to a few hundred meters below the surface. Why? 9
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4 •Groundwater exists in pore space , open holes between grains of rock and sediment Porosity % of total volume that is Porosity 10 - % of total volume that is open space. Equation? •Pores can be filled w/ water or gas •When pores are completely filled with water, rock/soil is saturated Controls on Porosity?? What makes porosity
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This note was uploaded on 05/15/2008 for the course GEOL 101 taught by Professor Kendall during the Spring '07 term at Clemson.

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

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