SWS 2007 Lecture 10: Lecture 10
9 Mar 2017
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Document Summary
But, 80 % of worldwide water withdrawals are from surface water. Lakes contain the majority of fresh surface water. Rivers contain only 2% of the total freshwater found in lakes. However, the majority of surface water withdrawal is from rivers. 6 countries possess half of the world"s total renewable freshwater supplies. South america: 3 of the 10 largest rivers, 25% of fresh river water, 5% of world population. Asia has 2/3 of world population, but 1/3 renewable water. Gaza has the lowest per capita water availability in the world. Saudi arabia, yemen, tunisia, libya, morocco, jordan, less than 6 inches of. Percent of total water use from surface water sources. Water found in pore spaces, seams cracks, and fractures in geologic material or soils beneath the surface of the earth. Some of the largest groundwater reserves are found in arid/ semi-arid regions paleo water or fossil water- water-bearing formations laid down thousands or millions of years ago.
