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<br />250 <br /> <br /> <br /> <br />300 <br /> <br /> 200 250 <br /> en <br />l- I>: <br />w w <br />w I- <br />u... w <br />w 200 ~ <br />I>: U <br />u 150 <br /><( co <br /> ::l <br />Z U <br />0 Mississippi River Z <br />..... 150 0 <br />..... at SI. Louis <br /> ..... <br />~ ..... <br />Z co <br /> 100 Z <br />I>: <br />W I>: <br />I- 100 w <br /><( I- <br />~ <( <br /> ~ <br /> 50 <br /> 50 <br /> <br /> <br />1972 <br /> <br /> <br /> <br />o <br />2000 <br />KWHR <br /> <br />00 <br /> <br />THERMAL-E LECTRIC <br /> <br />1000 <br />ENERGY, IN BILLION <br /> <br />Figure 3.-Annual withdrawals of water for Lhermal-electric power generation in the United States, 1920-72. <br /> <br />loss vis. a-vis evaporative loss frolll natural water bodies <br />than from high temperature ponds or cooling towers. <br />Cooling towers, moreover, waste a small proportion of <br />their water supply as drift (small droplets of water <br /> <br />escaping the tower without contributing to the evapora. <br />tion process) and, in most cases, have additional con- <br />sumption chargeable to "blowdown," disposal of poor- <br />quality waste water that cannot be returned to the <br /> <br />7 <br /> <br />. 0457 <br />