Removing groundwater faster than it is replenished

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Unformatted text preview: water intrusion Salt water seeps into fresh water Coastal areas 25 How can we increase freshwater supplies? 26 Dams There are doubts about how well they work over the long-term longSocial Dams, reservoirs, canals – store runoff for release as needed Desalination Diversions Conservation schemes like towing icebergs, cloud seeding, etc. etc. Displacement of people, loss of culturally significant monuments and sacred spaces Environmental Increased incidence of water borne diseases – particularly in tropical areas (e.g. bilharzias, malaria, yellow fever, Rift Valley tro fever) Drown free-flowing rivers and species that depend on them free- Technical Evaporative losses can exceed what is made available Sedimentation reduces effective life and starves downstream reaches of bedload Tectonic implications of weight of large dams Dams don’t work forever 28 Desalination Dams Positives: Recreational activities Electricity generation Flood control Stable water supply Negatives: Loss of land through flooding large area Displacement of communities, both natural and human Reduces deposits of nutrient rich sediments below dams Disrupts spawning and migration of some fish below dam It does work The U.S. National Research Council (2004) reports that there are at least 15,000 desalination pla...
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This note was uploaded on 08/10/2011 for the course ENV 200 taught by Professor Karening during the Spring '11 term at University of Toronto- Toronto.

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