GRG 304E Lecture 20 Notes
GRG 304E Lecture 20 Notes GRG 304E
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This 2 page Class Notes was uploaded by Cassidy Schap on Sunday September 27, 2015. The Class Notes belongs to GRG 304E at University of Texas at Austin taught by Thoralf Meyer in Summer 2015. Since its upload, it has received 19 views. For similar materials see Environmental Science: changing world in Geography at University of Texas at Austin.
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Date Created: 09/27/15
Lecture 20Water To know how much water goes through a pipe in an hour Pipe has a cross sectional area Read units of ow speed ms if you multiply ow speed with meters you let mquot3 Convert to L I mquot3 is 1000L Know that or convert it to dmquot3 I dmquot3 is 1 L Life on earth would be impossible wout water Humans approx 60 water Less than 3 is fresh ie usable By 2025 13 of people will live in places with v limited water Ogallala aquifer largest groundwater resource Overdrawing of surface water Wetlands dry up estuaries become saltier Serve as breeding ground for many species Shortages have great economenviro ram cations Water supply and water quality probs CO river basin Srs water prob in US Water for 30 mil people Irrigation for 35 mil acres lntl amp state laws and agreements Insufficient water supply for places Salinization of irrigated soil Gradual accumulation of salt in soil result of bad irrigation methods Normally precip runoff would carry away salts Aral sea Sustainable water use Wise use of water resources without harming the essential function of the hydro cycle or eco system Conservation includes reusing and recycling water improving efficiency Important part of sust Use Economic policies water is cheap so it is wasted Dams and reservoirs dams generate electricity and ensure year round supply of usable water Pro generate electricity and ensure year round supply of water for drinking and agriculture Create recreation area Flood and ow protectionregulation Con create a technical barrier Standing water body creates breeding ground for disease carrying insects Barriers for sh hinders migration Water conservation Reducing agricultural waste Reducing water waste in industry Reducing municipal water waste Water pollution phys or chem Change in water than neg affects organisms Phys changing state or temperature IE when plants pump water out of river use it for whatever purpose and then put it back Changes the ecological niche the river lls Sediment particles disease nutrients etc Sources sewage land lls Eutrophication lakes estuaries owing streams Oligotrophic unenriched clear water supports small populations of aquatic organisms Eutrophic cloudy water bc of large amt of algaecyanobac Enriched w inorganic plantalgal nutrients N amp P Can be natural long term process or arti cial eutrophication Overnourishment due to human activities causes algal blooms rids water of oxygen causes die off Point sources source that can be traced back to a particular source ie a pipe from a single factory Nonpoint sources pollutants that enter a body of water over large areas srather than a speci c single point of entry IE rain washes pollutants out of water and into rivers Groundwater pollution half of the US gets water from groundwater sources Quality is a concern pesticides fertilizers organic compunds from land lls storage tanks backyards golf courses etc Cleanup is not always technically feasible very costly