Question

How do shade balls prevent evaporation?

Answer 1

Answer:

Shade balls are made from high-density polyethylene, otherwise known as plastic. They are black, typically about 10 inches in diameter, and designed to reduce evaporation by 80 or 90 percent by providing shade from the sun, though that wasn't always their purpose, according to the Toronto Star. According to the Los Angeles Department of Water and Power (LADWP), shade balls could keep contaminants out of the water and reduce the evaporation of the reservoir by 85 to 90 percent during a drought.  The creators of shade balls originally used them to prevent chemical treatments in the reservoir from reacting with sunlight and creating bromate, which is a carcinogen regulated by the EPA. California began deploying shade balls in 2008 as a cost-effective way to reduce bromate levels and also prevent algae growth.

Explanation:

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