1. Water Resources: Content Building

2. Be able to define each of these. Let’s generate definitions together…

3. Watersheds
Area of land where water drains to the same place (e.g. river, lake, ocean)
“Nested” structure
Vary in size and shape
Different levels

5. Global Water Resources
70% of earth is covered with water
97% of that is salt water
3% of that is fresh water
Of that freshwater, less than 1% is available

6. Great Lakes Significance
20% of the fresh surface water on earth
95% of the US supply of fresh water
6 quadrillion gallons of water!

7. Human Impacts on Water Supply
Water Runoff  Urban areas, agriculture
Carries pollutants

8. Human Impacts on Water Supply
Water Consumption
What do we use water for?
How much???

9. Urban Domestic Water Uses

10. Water Use Trends

11. Kinds and Sources of Water Pollution
Point-Source of Pollution: Specific location; easy to identify.
Ex. City and industrial waste discharge pipes.
Non-Point Source of Pollution: Diffused, no specific location; hard to identify
Ex. Agricultural Runoff

12. Agricultural Pollution
Runoff of nitrates and phosphates from animal waste and fertilizers
Leads to eutrophication:
Excessive nutrients causes excessive plant and algae growth in water
Reduces oxygen in water, limits life

13. City Pollution Runoff from homes, streets, and businesses
Wide range of pollutants
Oil, gas
Fertilizers
Chemicals
Litter/debris

14. Industrial Pollution Factories and Industrial Complexes Mining
Dispose of waste in sewage systems
Thermal pollution  Putting water back that is now warmer
Affects aquatic life
Mining
Chemical run-off.
Acid mine drainage.