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50% of residents

50% of residents. Problems: Overdrafts Pollution (later). Groundwater Use and Supply (2). Figure 12.13. Water Uses (1). Offstream use: Removal or diversion from its SW or GW sources temporarily , e.g., irrigation, thermoelectric, industrial use

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50% of residents

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  1. 50% of residents

  2. Problems: Overdrafts Pollution (later) Groundwater Use and Supply (2) Figure 12.13

  3. Water Uses (1) • Offstream use: Removal or diversion from its SW or GW sources temporarily, e.g., irrigation, thermoelectric, industrial use • Consumptive use: Type of offstream use of water without intermediate return to the SW or GW, such as transpiration and human use • Instream use: Navigation, fish and wildlife, recreational uses • Water law • Riparian (you touch it, you use it; east of 100th meridian) • Appropriation (first in time; first in right; arid/semiarid)

  4. Trends in Water Use (2) • So what do we do about it? • Environmentalism • Reduce • Reuse • Recycle • New Environmentalism (Andy Posner, Huffington Post, 8/03/08) • Invent • Invest • Implement Figure 12.20

  5. Water Management (1) • Challenges for water management • Increasing demand for water use (population and economic development) • Water supply problems in semiarid and arid regions • Water supply problems in megacities of humid regions • Water traded as a commodity: Capital, market, and regulations?

  6. Management of the Colorado River (1)

  7. Significance of water • Hoover Dam/Lake Mead • Water to ImperialValley, LA • Power to CA, AZ, NV

  8. http://www.hcn.org/

  9. Irrigation 48% Electricity generation 36% Water supply 36% Flood control 39% Recreation/fisheries 29% Inland navigation 5% Multipurpose Dam(n)s

  10. Water and Ecosystems

  11. Emerging Global Water Shortage

  12. WATER POLLUTION

  13. Case History: NC Bay of Pigs

  14. Common Pollutants (1)

  15. Common Pollutants (2)

  16. Common Pollutants (3)

  17. The “Dead Zone” • Combination of BOD and fertilizer

  18. Common Pollutants (4)

  19. Common Pollutants (5)

  20. Breached waste ponds • Hurricane Floyd

  21. Common Pollutants (6)

  22. Common Pollutants (7)

  23. Common Pollutants (8)

  24. Surface Water Pollution and Treatment (1) • Point sources of pollution • Point sources are discrete, confined, and more readily identifiable • Common sources: Landfills, discharge from wastewater treatment plants, discharge from industries, power plants, storm water runoff, etc. • Identify sources, on-site treatment andmitigation, prevention • Bozeman area? Montana Superfund sites

  25. Surface Water Pollution and Treatment (2)

  26. Groundwater Pollution and Treatment (2)

  27. GW Treatment (3) • Extraction wells • Pump-and-treat: Bozeman solvent site • Bioremediation • Land-farming: Gallagator Trail • Vapor extraction: Livingston Rebuild Site • Let it clean itself(?)

  28. Water Quality Standards

  29. Wastewater Treatment

  30. Septic Tank Sewage Disposal System • Who’s on septic? • I am! • I’m not. • I don’t know • Where’s the well? Map view Section view

  31. Idealized Diagram for Wastewater Treatment Plant

  32. Wetlands as WW-Treatment Sites

  33. WW Renovation and Conservation Cycle

  34. Applied and Critical Thinking Topics

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