Transcript Urban Water Agency Prespective

Climate Change and Water Supply
An Urban Water Agency’s Perspective
Eric Bergh
Manager of Resources
October 28th, 2009
Calleguas Municipal Water District

Calleguas supplies
water to 22 water
agencies and cities
serving about
600,000 people in
southern Ventura
County.

Calleguas’ primary
source of water is the
Metropolitan WDSC.
Southern California
Service Areas
Climate Change – What’s Happened Already?
Excerpt from Managing an Uncertain Future. Climate Change Adaptation Strategies for
California’s Water - DWR, October 2008
Climate Change – An Ominous Forecast

“… the Sierra snowpack will experience a 25 to 40 percent
reduction from its historic average by 2050.”

“Climate change is also anticipated to bring warmer storms
that result in less snowfall at lower elevations, reducing the
total snowpack.”

“Warming temperatures, combined with changes in rainfall
and runoff patterns will exacerbate the frequency and intensity
of droughts.”

“Warmer temperatures will likely increase evapotranspiration
rates and extend growing seasons, thereby increasing the
amount of water that is needed for the irrigation of many
crops, urban landscaping and environmental water needs.”

Formed in 2008 to…
– improve research into the impacts of climate change on water utilities
– develop strategies for adapting to climate change
– implement tactics to reduce their greenhouse gas emissions.

Comprised of:
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–
–
–
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Metropolitan Water District of Southern California
Denver Water
New York City Department of Environmental Protection
Portland Water Bureau
San Diego County Water Authority
San Francisco Public Utilities Commission
Seattle Public Utilities
– Southern Nevada Water Authority
Questionable reliability of
imported water supply has led to…
 Increased resource diversity
 Focus on local resource projects
Las Posas Basin ASR Project
Program Concept
Las Posas Basin ASR Project
Historical LPB Storage
90,000 af
So Cal’s Storage Capacity
For Annual Seasonal and Dry Year Needs
Kern Delta Prop. 13 Programs
(start-up)
San Bernardino
Valley
Million Acre-Feet
3.0
Semitropic
Castaic
Perris
No. Las Posas
2.0
North Kern
& Mojave
Demo
Diamond
Valley Lake
Arvin
Edison
Greater than
10x Increase
Desert / Coachella
1.0
Lake Mathews
Lake Skinner
’90
’95
Year
’00
’05
Salinity Management Pipeline
Phase 3
Phase 2
Phase 1
By providing a means of transporting saline
water to the ocean, the SMP…
 Increases water reliability by allowing for ~40,000 acre
feet per year of saline groundwater to be put to use
 Reduces salinity of local supplies by removing ~170,000
pounds of salt from the watershed
Groundwater Desalting
Pure
Water
Concentrate
Flow
Semi-permeable Membrane
Delivering the 54-inch diameter
HDPE Pipe to Hueneme Road
Hueneme Outfall Replacement Project
Climate Change – Water Supply Impact
Summary of Response

Important to note… climate change isn’t only
pressing concern – ESA issues as well

Maximize conjunctive use opportunities

Expansion of new, non-traditional local supplies
www.calleguas.com
[email protected]