1. San Gabriel Valley From Stormwater to Supply
Presented by
Tony Zampiello,
Executive Officer
Main San Gabriel Basin Watermaster
February 16, 2016

2. Raymond Basin San Gabriel Basin Six Basins Chino Basin &
“PIPELINE STUDY”
San Gabriel Basin
Six Basins
Proposed
SGVMWD Pipeline
Chino Basin

3. 4/27/2017
Primary Water Supply
Pumping is sustained by local runoff and supplemented with imported water
Up to 90% from local supply
~ 250,000 AF/YR total
167 square-mile Basin surface area
About 200 wells and several surface diversions
San Gabriel River replenishes groundwater basin
“Imported” water (Sacramento Delta) supplements local supplies, during normal and dry periods

4. Appropriation of Flood Waters
Since 1934, the San Gabriel Valley Protective Association has been the appropriator of flood waters on the San Gabriel River.
Licenses for over 300,000 AF. (Salvage of flood flows.)
Association had no facilities for spreading
December 7, 1937, entered into a contract with Los Angeles County Flood Control District to spread

6. Groundwater Recharge (LA County)
Average recharge is 280,000 acre-feet of water per year
Enough water to serve over 2.2 million people each year
Over 1,000,000 acre-feet of water were recharged during the 2010 and 2011 water-years
The value of this water is more than $550 million

7. How Water Reaches the Aquifer
The Flood Control District, created in 1915 by State legislation, has a responsibility to manage stormwater runoff and other waters for beneficial and useful purposes
Operates and Maintains:
26 groundwater recharge facilities
(spreading grounds)
14 dams
16 rubber dams
524 miles of channels
2,800 miles of tributary storm drains

8. Key Facilities on the River
San Gabriel Dam
Morris Dam
San Gabriel Canyon Spreading Grounds
Santa Fe Spreading Grounds
Santa Fe Dam (Army Corps of Engineers)
Whittier Narrows Dam (Army Corps of Engineers)

10. Optimizing Large-Scale Storm Water Capture and Groundwater Recharge
Increase and Improve:
Storage capacity
Intake capacity
Percolation rate
Prepare for:
Long periods of stormwater runoff in wet years
Opportunities to increase recharge of recycled water
Opportunities to replenish the aquifers with imported water
Efficiency
Recently: 99% of San Gabriel River stormwater is captured

11. Enhance Stormwater Capture Projects
Coordination with County of Los Angeles Flood Control
Identified six (6) primary new stormwater capture projects
Walnut Creek Spreading Basin
Peck Road Spreading Basin
Olive Pit
Buena Vista Spreading Basin
San Gabriel Canyon Spreading Grounds
Miller Pit
Potential 15,000 AFY of additional “new water” captured from new projects
Four (4) projects have been implemented thus far
Buena Vista Spreading Basin (completed)
San Gabriel Canyon Spreading Grounds (completed)
Walnut Creek Spreading Basin (under design)
Peck Road Spreading Basin (under design)

12. Local Replenishment Challenges
Long-Term Imported Supply Reliability
Sediment Management
Environmental Balance/Climate Change
Flood Management
Meeting Future Demands

13. Questions www.watermaster.org