water: clear gold?. natural resource: water agenda: water conservation lesson plan topics: i. self...
TRANSCRIPT
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WATER:
Clear Gold?
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Natural Resource: WaterAgenda: Water Conservation
Lesson Plan Topics:
I. Self analysisA. Daily water consumptionB. National average per person
II. Aral SeaA. Size and reductionB. Socio-economic reasons and impactC. Applicable to Great Lakes
III. Conservation Treaty ProposalA. Conservation Home Evaluation WebsiteB. Five areas to improveC. Written proposalD. Present the proposalsE. Evaluate and reflect on the success of their implementationF. Correlations between this and the UN/Envirnomental Treaties
IV. Essay to Legislators
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Table 1: Dishwasher water use rates, national average*
National Average*
Dishwasher Load Volume 9.3 gallons
Daily Per Capita Use 1.0 gallons
Frequency of Use 0.1 loads per capita per day
*Mayer, et. al. 1999
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ARAL SEA
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Don’t let it happen!
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Aral Sea
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The Aral Sea is located in the countries
of Uzbekistan
and Kazakhstan.
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UZBEKISTAN
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The Aral Sea was once twice the size of Belgiumbut has steadily decreased in size.
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BELGIUM
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Aral Sea
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Aral SeaAbandoned BoatKarakalpakstan, Uzbekistan Uzbekistan was heavily irrigated during Soviet times, to provide water for growing cotton. The excessive water taken from the Amu-Darya river caused the Aral Sea to dry up. This has had devastating consequences for the region of Karakalpakstan. Here, a boat sits in what used to be the Aral Sea.
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SHIPGRAVEYARD
OF THE ARAL SEA
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The Aral Sea is located in southwestern Kazakhstan and northwestern Uzbekistan, near the Caspian Sea. See map, on slide above.
It was once twice the size of Belgium but has steadily decreased in size. Only a few decades ago, the Aral had: a surface area of 64,000 square kilometersa water volume of 1,020 cubic kilometersan average depth of twenty to twenty-five kilometers. Mineralization of the sea, which was freshwater, was less than 9 grams per liter. Each day, 160 tons of fish were pulled from its waters.
In the 1960s, economic officials in Moscow began diverting the waters from the Syr and Amu rivers, which flow into the Aral, for use in cotton farming. Irrigation canals were dug speedily without any type of lining, such as concrete or clay. Due to this, the canals lose up to 40% of the water they carry before it reaches its crop or destination. However, at the time, the large amounts of money from cotton blinded the officials to the definate future results of their actions. They pushed the cotton industry at all costs!
Currently, Kazakhstan and Uzbekistan are substituting less water intensive crops such as winter wheat, grains, soybeans, fruits, and vegetables to replace the cotton industry thus reducing some of the need for irrigation.
History of Aral Sea
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Recent aerial view of Aral Sea
Its sea level is now 40 meters, its surface area 40,000 square meters, and its volume 400 cubic kilometers.
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Aral Sea
• http://visearth.ucsd.edu/VisE_Int/aralsea/framesets/aralnav_fish.html
Use this interactive website to click on various locations within the Aral Sea to retrieve a close up view.
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Withdrawals and Consumptive Uses of Water
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Diagram showing inflow and outflow rates for Lake Michigan(source: U.S. Geological Survey Water-Resources Investigations Report 00-4008)
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Figure 6. Decline in water levels in the sandstone confined aquifer, Chicago and Milwaukee areas, 1864-1980. (Modified from Avery, 1995.)
DECLINE
IN
AQUIFER
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GREAT LAKES WATERSHED BASIN
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Figure 4. Estimated ground-water withdrawal rates for some major U.S. metropolitan areas (data not available for Canadian areas).
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The subcontinental divide that crosses the study area is the watershed boundary for the Great Lakes Basin. West of this divide, rivers and the waters that replenish them do not discharge to the Great Lakes but, instead, are tributary to the Mississippi River. The subcontinental divide is very close to Lake Michigan
in southeastern Wisconsin.
The map shows that more
than half the case study
area lies west of the divide
and, therefore, falls in the
Mississippi River Basin.
Subcontinental Divide and the Great Lakes Basin
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The Importance of Ground Water in the Great Lakes Region
Ground water helps to replenish the lake level water.
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Extra Slides
• The following slides are extra resources for the teacher.
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Rapid vs. Slow Ground-Water Circulation:
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Figure 5. Generalized ground-water flow (A) under natural conditions and (B) affected by pumping (Note that surface-and ground-water divides are coincident in A but not in B).
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Figure 1. Surficial geology of the Great Lakes Basin
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