'Shade balls' are invading LA. We can explain

On Monday, LA mayor Eric Garcetti dumped 20,000 so-called “shade balls” into the Los Angeles Reservoir. It's the final stage of that city's water quality protection plan, an effort costing $34.5 million. A shade ball, which 

Trending Tonight @ 10: Millions of "shade balls" sit on top of the Los Angeles reservoir to conserve water. The FDA goes after Kim Kardashian over an Instagram post. And EA Sports says Patrick Kane will not appear on the cover of NHL16.

NPR's Robert Siegel talks with Richard Harasick, director of water operation at the Los Angeles Department of Water and Power, about the last batch of plastic balls launched to cover LA reservoir. (SOUNDBITE OF ARCHIVED RECORDING). UNIDENTIFIED 

LOS ANGELES (CBSLA.com) — City officials on Monday plan to release 20,000 shade balls into the Los Angeles Reservoir to help comply with regulations for safe drinking water. Shade balls are made of a black, plastic and weighted material that is used 

A total of 96m black polythene balls now cover water at reservoir in Sylmar, California, to protect against evaporation.