Why Los Angeles Reservoirs Are Covered With Black Plastic Balls
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On August 13, Los Angeles Mayor Eric Garcetti along with officials from the water department watched as the last 20,000 "shade balls" rolled their way into the city's largest in-basin water reservoir. The release marked the final phase of the project that involved covering the 175-acre lake with 96-million four-inch black plastic balls. Their purpose? To provide shade and improve water quality.