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...

Want the full story?

Subscribe Now

Subscribe
Subscribe

Get TIME the way you want it

  • One Week Digital Pass — $4.99
  • Monthly Pay-As-You-Go DIGITAL ACCESS$2.99
  • One Year ALL ACCESSJust $30!   Best Deal!
    Print Magazine + Digital Edition + Subscriber-only Content on TIME.com

Learn more about the benefits of being a TIME subscriber

If you are already a subscriber sign up — registration is free!