PresentationtothePresentation to the 

Western Sustainability and Pollution Prevention Network Conference  ‐October 28, 2010

City of San Diego’s ffi i &Energy Efficiency & 

Water ConservationWater Conservation

C thl C Pi iCathleen C. PieroniPublic Utilities Department Long‐Range Planning & Water Resources Division

San Diego Water SystemSan Diego Water System

• 1.3 million people

• 404 Square Miles

• Avg. Daily Consumption more than 200 MGD

• 9 Raw Water Reservoirs

• 3 Water Treatment Plants

More than 3 000 Miles of• More than 3,000 Miles of Pipelines

• 27 Distribution Reservoirs/StandpipesReservoirs/Standpipes

• 50 Pump Stations

• More than 110 Pressure Zones

2

San Diego Wastewater SystemSan Diego Wastewater SystemMetropolitan System

• 2.2 million people

• 450 square miles

• City of SD &15 Participating

agencies

• Approximately 180 MGD

• Point Loma WWTP• Point Loma WWTP

• Metro Biosolids Center

• 4 Major Pump Stations

Municipal Collection System• 1.3 million people

• 330 square miles

3

q

• 3,000 miles sewer lines

• 83 pump stations

San Diego Recycled Water SystemSan Diego Recycled Water System

4

City of San Diego’s Water SupplyCity of San Diego s Water Supply

Source: City of SD Public Utilities Department 8/16/10

Average (2005-2010)

Sacramento-San Joaquin Delta

Estimated energy intensity of water in San Diego CountySan Diego County

• Relationship of water to energy, broken downp gy,

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City of San Diego’s Electricity UseCity of San Diego s Electricity Use

10

Emissions from Electricity Usage by Category (MT CO2e)Category (MT CO2e)

11

ISO 14001 CertifiedISO 14001 Certified

W t S t

• Increased Employee Awareness

12% 6%

Water System Operations Energy

Awareness• Saving Natural Resources• Reducing Environmental  80%

6%1%

gFootprint

• Reducing CostsPump Stations

Filtration Plants

Buildings

Misc

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San Diego Keeps GrowingBy 2030 San Diego may need 11% more water

San Diego Keeps Growing 

2030: 275,925acre-feet per year

2007 248 0002007: 248,000 acre-feet per year

The Climate CycleThe Climate CycleGlobal Climate ChangeRegulatory 

FocusPlanning Focus

GHG Emissions Regional Impacts

ationAdap

Natural SourcesAnthropogenic 

Sources Natural Systems Human Systems

Mitiga

ptationPrimary Contribution Sectors Primary Impact Sectors

Transportation Industry Electric Power Water Resources

Environment

Coastal Zones

Agriculture

14Drivers

Adaptation: Local Water SuppliesAdaptation: Local Water Supplies

• Water Conservation• Local Runoff ‐ Reservoirs• Recycled Water• Brackish Groundwater desalination• Groundwater Conjunctive Use• Seawater Desalination (San Diego Region)• On‐site alternatives:

– Greywater– Stormwater capture

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San Diego is ConservingSan Diego is Conserving

1600300000

1200

1400

1600

250000

300000

Demand (AF)

Reduced Water Demand

et

800

1000

150000

200000

ula

tion

x

1000

nd

in A

cre-

fee

400

600

50000

100000 Pop

u 1

Wat

er D

eman

0

200

0

50000

1970

1971

1972

1973

1974

1975

1976

1977

1978

1979

1980

1981

1982

1983

1984

1985

1986

1987

1988

1989

1990

1991

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1995

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1997

1998

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

162 2 2 2 2 2 2 2 2 2 2

Fiscal Year

SavingWater in Commercial SettingsSaving Water in Commercial Settings

JoEllenJacobyJoEllen Jacoby

San Diego Public Utilities Department

17

Commercial Landscape Survey ProgramSurvey Program

Uses Water Resources Landscape Database (WRLD) water budget

Measures commercial landscaping using aerial photographs &aerial photographs & geo-graphic information systems

Records irrigation water budget on water billbill

Creation of the CLSPCreation of the CLSPBegun summer 2002g1800+ budgets prepared2,402 acres surveyed (including mixed meter sites)785,646 H.C.F. potential water savings

CLSP - Site VisitCLSP - Site VisitIrrigation specialist walks site with g pknowledgeable landscape maintenance personnel: 

id ifi h l d h i i didentifies the landscape area that is serviced by each meterchecks water pressure at the backflowchecks water pressure at the backflow

CLSP – Site VisitCLSP Site Visitnotes broken/missing equipment and mismatched headsmismatched heads notes over‐spray and poor coveragenotes blocked spray heads and inadequatenotes blocked spray heads and inadequate clearanceidentifies mixed plant material on the same valve

CLSP – Site VisitCLSP Site Visitchecks for mulch coveragegdiscusses irrigation scheduleperforms one or more catch can test checks pressure at various irrigation heads

CLSP - Back in the OfficeCLSP Back in the OfficeIrrigation specialist prepares a report:

using satellite imagery the landscape area canusing satellite imagery the landscape area can be identified as grass, shrubs and groundcover, native plant material or hardscape

CLSP Report PreparationCLSP Report PreparationAnnual water requirement is determined per 

b dmeter based on:crop coefficientdistribution uniformitydistribution uniformityevapotranspiration (regionally based)area measurearea measure  

Water Use vs. BudgetWater Use vs. Budget

Overwatering DiagramOverwatering Diagram

Post Survey ResultsPost Survey ResultsSurveys completed in 2005 attained water y psavings of:    (14 sample size)

‐6% in 2006‐9% in 2007‐19% in 2008

Weather Based Irrigation ControllersWeather Based Irrigation Controllers

Grass replacement rebate

•Rebate for Rotator nozzles•Rebate for micro-spray, dripRebate for micro spray, drip and inline drip hose

Water Saving DevicesWater Saving Devices

Water Brooms• Water Brooms• Cooling Tower upgrades

• Possibly connect to recycled water

• Toilets• FlushometersFlushometers• High Efficiency• Urinals

Connectionless Food• Connectionless Food Steamers

• Air cooled Ice machines

Thank You