geology_27

geology_27 - Chapter 11: Water Resources cont. Groundwater...

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Chapter 11: Water Resources cont. Groundwater use and supply: Available GW estimated above the total flow of the Mississippi during the last 200 years GW as primary drinking water source for ~50% of the U.S. population GW overdraft problems (extraction rate exceeding recharging rate) in many parts of the country, particularly some states in the Great Plains region Estimated 5% of GW depleted, but water level declined more than 15 m (20 ft) in some areas Interactions btw. SW and GW Overdraft of GW : Leads to lower water levels of streams, lakes, reservoirs, etc. Overuse of SW : Yields lower discharge rates of GW Effluent (Gaining) stream (in GW discharge zone): Tends to be Perennial (i.e., flow all year) Influent (Losing) stream (in GW recharge zone above the water table): Are often above the water table, and flow in direct response to precipitation May be intermittent or ephemeral (flow part of the year) Special linkage area :
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geology_27 - Chapter 11: Water Resources cont. Groundwater...

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