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Thread: Why Are 96,000,000 Black Balls on This Reservoir?

  1. #1
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    Why Are 96,000,000 Black Balls on This Reservoir?


    Source: https://www.youtube.com/watch?v=uxPdPpi5W4o

    "Published on May 10, 2019 by Veritasium

    I took a boat through 96 million black plastic balls on the Los Angeles reservoir to find out why they're there. The first time I heard about shade balls the claim was they reduce evaporation. But it turns out this isn't the reason they were introduced.

    Huge thanks to LADWP for arranging this special tour for me. Next time let's put the GoPro on the submersible!

    The balls are made of high density polyethylene (HDPE) which is less dense than water so they float on the surface of the reservoir even if they break apart. They are 10cm (4 inches) in diameter and contain about 210ml of water. So the main reason they are on the reservoir is to block sunlight from entering the water and triggering a chemical reaction that turns harmless bromide into carcinogenic bromate. This effect occurs with prolonged exposure to bromate so regulators insist that levels be kept below 10 microgram per liter on average over a 12 month period."

  2. The Following 4 Users Say Thank You to Kathy For This Useful Post:

    Aragorn (29th May 2019), Dreamtimer (29th May 2019), Elen (2nd June 2019), Kitsune (29th May 2019)

  3. #2
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    Isn't that cool! I sent that video to Aragorn a bit ago.

  4. The Following 4 Users Say Thank You to Kitsune For This Useful Post:

    Aragorn (29th May 2019), Dreamtimer (29th May 2019), Elen (2nd June 2019), Kathy (29th May 2019)

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