File:BallsCoverReservoir.jpg

Los Angeles Department of Water and Power employees dump 400,000 black plastic balls in an effort to cover the Ivanhoe Reservoir, Silver Lake, California, 10 June, 2008.

Using the balls to cover the reservoir is to prevent the formation of harmful bromate in the water. The reservoir is set to close in four years.

Irfan Khan / Los Angeles Times, Copyright 2008 Los Angeles Times.