Chapter 14 - Chapter14:Water 13:32 WatersImportance...

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Chapter 14: Water 13:32 Water’s Importance Keeps us alive Moderates climate Sculpts the land Creates biomes Transfers nutrients Moves through the hydrological cycle Water’s Availability Only about 0.02% of the earth’s water supply is available as liquid freshwater The rest: oceans, ice, groundwater Figure 14-2 Groundwater Surface runoff Watershed Groundwater- Aquifers Renewable aquifers Natural recharge vs. lateral recharge Nonrenewable aquifers Does not refill
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Recharge slowly Surface Water Reliable runoff About 70% of the water we withdraw from rivers, lakes, and aquifers is not  returned to these sources Figure 14-3 Water Usage in the US 70% for irrigation (major agriculture) 20% for industry 10% for cities Too Little Freshwater Competition for water 41% world’s population lives in river basins that do not have enough  freshwater Freshwater Resources in the US 17 western states by 2025 could face intense conflict Fig. 14-4, 14-5 Cities vs. farmers Production of biofuels now competing for water Countries are importing grain as a way to reduce then water use Requires $, other countries may run out Government vs. private corporations
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Euro-based water companies aim to control 70% of US water supply by  buying up water companies and entering into agreements with cities to  manage water supplies
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This note was uploaded on 11/14/2010 for the course BIO 1105 at Virginia Tech.

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Chapter 14 - Chapter14:Water 13:32 WatersImportance...

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