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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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Problems:

Overdrafts

Pollution (later)

Groundwater Use and Supply (2)

Figure 12.13


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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)


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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


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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?



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Significance of water

  • Hoover Dam/Lake Mead

  • Water to ImperialValley, LA

  • Power to CA, AZ, NV



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Irrigation 48%

Electricity generation 36%

Water supply 36%

Flood control 39%

Recreation/fisheries 29%

Inland navigation 5%

Multipurpose Dam(n)s









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The “Dead Zone”

  • Combination of BOD and fertilizer




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Breached waste ponds

  • Hurricane Floyd





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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




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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(?)




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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






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