Geography Notes

Geography Notes - Geography Work March 3 2007 – Lecture 7...

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Geography Work March 3, 2007 – Lecture 7 Environmental Log www.nytimes.com www.enn.com www.newsdesk.org/news check sites daily 18 events location, date, source, and description of event with tie in to physical geography. Extra Credit, replaces lowest pop quizzes Watrer Resources Groundwater In Xanadu did Kubla Khan A stately pleasure dome decree: where Alph, the sacred river, ran through caverns measureless to man down to a sunless sea…. Flowing rivers or lakes that were underground----that’s what they though True or False Ground water is 22% of all earths freshwater resources. True Groundwater is an independent source or water—false 50% of the US pop derives some of its water from groundwater resources---True Bama has enough ground water to cover the entire state to a depth of 50 ft true 80% of the public water system is Alabama depend of groundwater for at least part of its supply—true Concepts - Groundwater resource - Links to water surface - Management and utilization - Contamination - Global water budge and availability Outline - intro - definitions and basics - groundwater utilization
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- us water supply - global water supply - contamination - case study: ground water surface water- red river chloride conrol project. 1. Intro - what - where - why - how 2. What is groundwater a. Water in saturated zone below the surface of the ground b. Part of the hydrologic cycle that lies beneath the land surface 3. Groundwater occurs everywhere. Most of it we use is within 325 ft bls. 4. Why is it there? a. Surplus water b. Excess surface water c. Check out the soil water balance equation Ages of Groundwater - Deep wells in Saudi 3000-10000 years old - Potable in shallow less than 10 years old. Advantages of Groundwater - inexpensive infrastructure - low environmental impact - large storage capacity - good quality 2. Definitions - aqua – water - ferre- to bring - store and transmit water - formation or part of a formation containing sufficient saturated permeable material to yield significant quantities of water to wells and springs. At its simplest… - an aquifer is: o a rock unit that can store and transmit water to a well or spring in useful amounts properties of aquifers - porosity o amount of open pore space, gap or grains in rock that can hold water expressed as % o 10-30% high porposity
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o dependent on size, shape, orientation and degree of campaction of mineral grains - Permeability o Measures of interconnectedness of pores o Primary- intragranular o Secondary- fracture systems, solutional network Permeable- impermeable - permeable- allows passage of water - impermeable- obstructs water movements Aquiclude - opposite to aquifer - does not transmit water in useable amounts Water table - upper limit of water in the zone of saturation - contact between the zones of saturation and aeration - zone of saturation all pore space filled with water Unconfined Aquifer - water bearing layer not confined by an overlying impermeable layer - watertable- upper surface at which pressure is atmospheric. Level at which water
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Geography Notes - Geography Work March 3 2007 – Lecture 7...

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