Water and Humans - Climate change Poverty and economic...

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Water and Humans MIE380: Ecological Systems Spring 2010 March 8, 2010
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Global Water Cycle 2
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Regional Water Cycle 3
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Local Water Cycle 4
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Freshwater Dynamics Evaporation off the surface of the oceans = approximately 505 000 km 3 a year Evaporation from land surfaces = 72 000 km 3 0 of all precipitation (about 458 00 3 80% of all precipitation (about 458 000 km ) falls on the oceans 20% (119 000 km 3 ) falls over land The difference between precipitation and evaporation is runoff and groundwater recharge – approximately 47 000 km 3 per year 7
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Common Water Resource Problems Inadequate surface water supply Overdraft of groundwater Pollution of surface water and groundwater Quality of drinking water Flooding Erosion and sedimentation Dredging and disposal of dredged material Drainage of wetlands and wet soils Degradation of bays, estuaries and coastal waters 13
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Common Causes Population growth Food production
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Unformatted text preview: Climate change Poverty and economic policy gislation and water resource management Legislation and water resource management Land use Water quality Water demand International waters Political realities Sociological issues 14 Water Stress less than 1 700 m 3 of water per person per year for all major functions (domestic, industrial, agricultural, and natural ecosystems) Scarcity: less than 1 000 m 3 per person. 600 million people face water scarcity Between 2.7 billion and 3.2 billion people may be living in either water-scarce or water-stressed conditions by 2025. 15 16 17 18 19 20 21 Case Study Once upon a time. ..4 th largest lake in the world Unsustainable diversions onsequences: Consequences: Environmental Climate Aquatic life Agriculture Human health 22...
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This note was uploaded on 07/24/2010 for the course MIE MIE380 taught by Professor Enright during the Spring '10 term at University of Toronto- Toronto.

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Water and Humans - Climate change Poverty and economic...

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