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Unformatted text preview: 1 Lecture 19: Water Resources 1. Water: Basic facts 2. Water availability and use 3. Types of pollutants 4. Important laws 5. Issues: POINT versus NONPOINT 6. Issue: Groundwater pollution Suggested Reading: Tepfer, K. 2004. The real price of water. Frontiers in Ecology & Environment 2:59. Water pollution • Any physical, biological, or chemical change in water quality that adversely affects living organisms can be considered pollution. Groundwater Pollution • About half the U.S. population, and 95% of rural residents, depend on underground aquifers for drinking water. Issues: Groundwater pollution • Some pollutants removed as water moves down to aquifer (many pathogens, for instance). • Extremely difficult to remove pollutants from ground water. Groundwater and Drinking Water • EPA estimates 4.5 trillion liters of contaminated water seep into the ground in the U.S. every day. Point vs. Nonpoint • _____________________ – ones that are discrete & easy to ID in landscape. – Examples: smoke stacks, factory pipes, sewage plants....
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- Fall '08
- Drinking water