Los Angeles covers reservoir waters with ‘shade balls’

Los Angeles covers reservoir waters with shade balls
In this Monday, Aug. 10, 2015 photo provided by the Los Angeles Department of Water and Power, Los Angeles Mayor Eric Garcetti, in suit at center rear, and LADWP workers deposit the final batch of over 90 million "shade balls" into the Los Angeles Reservoir in the Sylmar area of Los Angeles. The plastic balls were placed to protect water quality and to save 300 million gallons of water a year from evaporation. (Art Mochizuki/Los Angeles Department of Water and Power via AP)

LOS ANGELES (AP) — Los Angeles has been blackballed.

The city has completed a program of covering open-air reservoirs with floating “shade balls” to protect water quality.

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 sunlight from penetrating the 175-acre surface of the reservoir.

That prevents chemical reactions that can cause algae blooms and other problems, allowing the Department of Water and Power to meet U.S. Environmental Protection Agency water-quality requirements.

They have the added perk of aiding with the ravages of the drought, and are expected to keep about 300 million gallons annually from evaporating.

“In the midst of California’s historic drought, it takes bold ingenuity to maximize my goals for water conservation,” Mayor Eric Garcetti said in a statement, noting that the effort is “emblematic of the kind of the creative thinking we need to meet those challenges.”

The 36-cent balls also will help prevent evaporation of 300 million gallons of water annually from the 3.3 billion-gallon reservoir, the DWP said.

The city began using shade balls in 2008, and they now also cover the Upper Stone, Elysian and Ivanhoe reservoirs.

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