1024LectureFile6

1024LectureFile6 - Water as a Resource A different...

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Water as a Resource 1 •A different perspective. –We tend to think of metals and energy as resources. –All of the questions about availability and usage apply to water. •Annual human requirement is about 10.3 liters/kilogram. –70 kg {154 lbs} means 720 liters.
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2 Paper (per metric ton) Bricks (per metric ton) Oil (per barrel) Aluminum (per metric ton) Iron (per metric ton) 261,000 2,100 1,770 1,461,000 125,000 Product Water required (l) Industrial
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3 Oceans/Salt Lakes Ice and Snow Groundwater Lakes and Rivers Soils, wetlands, biota Atmospheric Earth’s Water 97.41 1.98 0.59 PTH, 4th, Figure 8.1, Page 206
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Samuel Taylor Coleridge 4 •English poet 1772 - 1834. –Water, water everywhere, And all the boards did shrink; Water, water everywhere, nor any drop to drink.
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Current Water Sources 5 •Fresh surface waters. –Streams, rivers and lakes. •Fresh groundwater. –Springs or pumped from aquifers. •Other. –Desalinized seawater. –Enhanced rainfall. –Physical transport of ice or water.
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Surface vs. Groundwater 6 •Both start as precipitation. –Shallow. •Surface waters are the runoff. •Groundwater is absorbed. –Within a drainage basin. –Infiltrated to water table. –Overland and through flow. Mi, 14th, Figure 14.3, Page 308 K, 8th, Figure 10.3, Page 264
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Surface Water Flow 7 •Function of channel size and gradient. –Gradient = slope of channel. •Quantified as discharge .
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1024LectureFile6 - Water as a Resource A different...

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