8. Water - Prof. Turner The Earth Transformed 9.25.07 I)...

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Prof. Turner The Earth Transformed 9.25.07 I) Water 1) Hydrologic (water) cycle a World’s water cycle (i) Precipitation (ii) Evaporation (iii) Evapotranspiration (iv) Runoff 2) Global Characteristics a 70% of earth’s surface is water (i) ~1,225,000,000 cubic miles (~1,070km 3 ) b Almost 97% is in oceans & not immediately available for human use (< 3% fresh H 2 O) (i) 99.3% of fresh water is in the Artic and Antarctic icecaps [not immediately available for human use] (ii) 0.3% of freshwater on the surface of the earth is on terrestrial surface including groundwater (iii) This % is about 100,000 km 3 or 8 trillion acre feet (~28 mi 3 ) 3) Water in the Biosphere a Distribution of Earth’s Water (i) Earth’s Water Freshwater 3% Saline (oceans) 97% (ii) Freshwater Other 0.9% Surface water 0.3% (iii) Rivers 2% 4) The Water Problem Globally a Exponential growth in demand for water Water withdrawal globally (i) 1925 – 25% (ii) 1955 – 50% (iii) 1975 – 75% (iv) 1987 – 100% b Uneven availability of water
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This note was uploaded on 04/24/2008 for the course GEOG 180 taught by Professor Turner during the Fall '08 term at Clark University.

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8. Water - Prof. Turner The Earth Transformed 9.25.07 I)...

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