Skip to main content

Prioritizing localized stormwater capture for water supply and water quality benefits

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

The Water Replenishment District of Southern California (WRD) manages the Central and West Coast Groundwater Basins (Basins) for nearly four million residents in 43 cities of southern Los Angeles County. In an effort to increase its sustainable water supply portfolio and to decrease its reliance on imported water, WRD is investigating alternatives to capture more stormwater for groundwater recharge. WRD's 420 square mile service area is located within Los Angeles' most urbanized watersheds including those of the Los Angeles and San Gabriel Rivers. Segments of these rivers and their receiving waters are impaired and subject to existing and proposed enforceable surface water quality regulations including multiple TMDLs.

To identify catchments with greatest potential to provide distributed and subregional groundwater recharge and to help reduce pollutant loading of surface water bodies, an in-depth, regional assessment was conducted using spatial analyses and locally developed models. These models included the Structural Best Management Practices Prioritization and Analysis Tool (SBPAT), the Groundwater Augmentation Model (GWAM), and the WRD/U.S. Geological Survey (USGS) MODFLOW model. The assessment considered a suite of factors important to siting groundwater recharge projects (e.g. geologic conditions, pre-existing contamination, dewatering) and local water quality objectives.

Analyses identified approximately 10% of the 270,000 acres within the WRD service area as opportunities for local and regional stormwater recharge where nearly 17,000 acre-feet per year of potential water supply benefits can be expected. Of those, nearly 8,000 acres were identified as high priority areas that could contribute more than 4,000 acre-feet per year to the local potable aquifers. In addition, the study identified that each acre of land in south Los Angeles County that receives appropriately well-sited retrofits could annually yield approximately 0.54 acre-feet of groundwater recharge and more than 200 pounds of pollutant reduction.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864712811698970

Publication date: 2012-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more