Metropolitan Water District of Southern California
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When the Metropolitan Water District was building its Colorado River Aqueduct, it bought some land adjacent to the Hayfield pumping plant for a small reservoir. In 1939, plant operators watched as water filled the natural basin at the plant located between Palm Springs and Desert Center, and then watched as it slowly disappeared into the ground.

District investigations in the 1940s showed that the bottom of the reservoir was too porous to hold water, and the surface reservoir idea was abandoned. Metropolitan's board took a second look in 1999 by launching a demonstration project to study if surplus Colorado River water could be stored in the Hayfield aquifer. The object of the study was to determine whether water could be pumped out of the groundwater basin and put back in the aqueduct for use in urban Southern California during years of water shortages.

This is particularly important because growth in Arizona and Nevada is forcing Southern California to do without surplus Colorado River water in the next 15 years and resort to a strategy of storing water in wet years for use in dry years.

Preliminary investigations indicate that Metropolitan could store up to 800,000 acre-feet* of water in the basin.

*-acre-foot (af) approximately 326,000 gallons or enough water for two typical Southern California families for use in and around their homes each year.

PURPOSE

  • Assist Metropolitan in complying with California's Colorado River Water Use Plan
  • Increase dry-year water supply reliability for Southern California
  • Conserve available CRA supplies for later use in dry years
  • Increase reliability of Metropolitan Colorado River supplies
PROJECT FACTS & FEATURES
  • Located between Chiriaco Summit and Desert Center
  • 8,000 acres owned by Metropolitan
  • 800,000 af of possible storage
  • Project cost $68 million
  • 50 wells
  • Infiltration rate-135,000 acre-feet a year
  • Extraction rate-150,000 acre-feet a year

Click on map to enlarge.

DEMONSTRATION FEATURES
  • One full-scale production well and several monitoring wells that will become an integral part of the project
  • Analysis of evaporation, water quality and water-level monitoring to establish baseline technical information
  • Storage of 64,000 af of available Colorado River water during the demonstration project
WATER SUPPLY
  • Colorado River Aqueduct

BENEFITS

  • Increase power supply reliability through a cooperative agreement with the California ISO
  • Protect indigenous groundwater resources in the Hayfield Valley
  • Protect water quality in the Hayfield Valley
  • Preserves Desert Tortoise habitat
  • Preserves archaeological sites in the Hayfield Valley

 

Page updated: July 19, 2007