洛杉矶向露天水库投放遮阳球保护水质
[font=Verdana, Arial, Tahoma][size=14px][b]The city has completed a program of covering open-air reservoirs with floating "shade balls" to protect water quality.[/b][/size][/font][font=Verdana, Arial, Tahoma][size=14px][b]为了保护水质，洛杉矶市向露天水库投放了9600万个“遮阳球”，这些球浮在水面上，水库表面已被遮盖。目前该项目已全部完成。[/b][/size][/font]
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[font=Verdana, Arial, Tahoma][size=14px]City officials this week dumped the last 20,000 of 96 million black balls into the Los Angeles Reservoir in Sylmar, 25 miles northwest of downtown. The 4-inch-diameter plastic balls block [url=http://www.enread.com/news/life/101735.html]sunlight[/url] from [b]penetrating[/b] the 175-acre surface of the reservoir.[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]That prevents chemical reactions that can cause [b]algae[/b] blooms and other problems, allowing the Department of Water and Power (DWP) to meet U.S. Environmental Protection Agency water-quality requirements.[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]They have the added [b]perk[/b] of aiding with the [b]ravages[/b] of the drought, and are expected to keep about 300 million gallons [b]annually[/b] from evaporating.[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]"In the midst of California's historic [url=http://www.enread.com/news/life/101735.html]drought[/url], it takes bold [b]ingenuity[/b] to maximize my goals for water conservation," Mayor Eric Garcetti said in a statement, noting that the effort is "[b]emblematic[/b] of the kind of the creative thinking we need to meet those challenges."[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]The 36-cent balls also will help prevent [b]evaporation[/b] of 300 million gallons of water annually from the 3.3 billion-gallon reservoir, the DWP said.[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]The city began using shade balls in 2008.[/size][/font]
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