Science: Underground Dam

Los Angeles County (which frequently strives to be different) is building an underground dam—made of water. Purpose of the new dam: to keep the sea from seeping into the deep wells that supply a large part of the water for half a million people.

South of Los Angeles and inland from Manhattan Beach is a flat suburban area that was once semidesert. It had no surface water, but under its tight clay subsoil lay water-saturated gravel. When real-estate boomers discovered this treasure, they drilled well after well, and the well water, used recklessly, made...

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