Irrigation draining California groundwater at 'unsustainable' pace | Science News

ADVERTISEMENT

SUPPORT SCIENCE NEWS

Science News is a nonprofit.

Help us keep you informed.


News

Irrigation draining California groundwater at 'unsustainable' pace

The GRACE satellites have tracked water movement from the Central Valley since 2003

By
3:18pm, December 15, 2009

SAN FRANCISCO — In the past six years, the irrigation of crops in California’s Central Valley has pulled groundwater from aquifers there at rates that are unsustainable if current trends continue, scientists say.

The Central Valley, which covers about 52,000 square kilometers, is one of the world’s most productive agricultural regions, says Jay Famiglietti, director of the University of California Center for Hydrologic Modeling in Irvine. In 2002, farmers there produced more than 250 different crops worth a total of around $17 billion — an amount that adds up to around one-twelfth of the nation’s agricultural production, he notes.

But the productivity of those fertile fields is increasingly at risk: Satellite data suggest that more than 20 cubic kilometers of groundwater has been pumped from the valley’s aquifers since October 2003, Famiglietti reported December 14 at the fall meeting of the American Geophysical Union. That&rsquo

This article is only available to Science News subscribers. Already a subscriber? Log in now. Or subscribe today for full access.

Get Science News headlines by e-mail.

More from Science News

From the Nature Index Paid Content