san diego water energy nexus shortened version

8/7/2019 San Diego Water Energy Nexus Shortened Version

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City of San Diegos

Water and Energy Nexus

World Resources Simulation CenterSeptember 22, 2010

George J. Adrian, PEPublic Utilities DepartmentLong-Range Planning & Water Resources Division


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Sources of San Diegos WaterSupply

22

LAKESHASTA

LAKEOROVILLE

State WaterProject(Bay-Delta)30%

Colorado River50%

Local SuppliesandConservation20%

San Diego Countyimports ~80% of its

water supply


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San Diego Water System

33

1.3 million people

404 Square Miles

Avg. Daily Consumption more than200 MGD

9 Raw Water Reservoirs

3 Water Treatment Plants

More than 3,000 Miles of Pipelines

27 DistributionReservoirs/Standpipes

50 Pump StationsMore than 110 Pressure Zones


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By 2030 San Diego may need 11% more water

2007: 248,000

acre-feet per year

2030: 275,925acre-feet per year

San Diego Keeps Growing


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Local Surface Water3%

RecycledWater3% Conservation15%

Imported79%

Source: City of SD Public Utilities Department 8/16/10FY 2010 Actuals

Water Supply Portfolio


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Carbon Footprint by WaterSource

66

0

500

1000

1500

2000

2500

3000

3500

4000

4500

0

500

1000

1500

2000

2500

3000

3500

4000

4500

ColoradoRiverAqueduct

StateWaterProject

Groundwater

RecycledWater

SeawaterDesal

BrackishGroundwaterDesal

OCWDGroundwaterReplenishmentProject

kWh/ AF

Source: Pacific Institute analysis regarding SDCWA data Source of OCWD GW Replenishment: City of San Diego


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Adaptation: Local WaterSupplies

Water ConservationLocal Runoff - ReservoirsRecycled Water

Brackish Groundwater DesalinationGroundwater Conjunctive UseSeawater Desalination (San Diego Region)On-site alternatives:

GraywaterStormwater capture

77


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Electricity Demand in State of California

19% of electricity in California is water related

88Refining Estimates of Water Related Energy Use In California, CEC, December 2006

3% 5%3% 3%

4%1%

81%Gigawatt Hours (GWH)

Agricultural

Residential

Commercial

Industrial

Water Supply andTreatment

Wastewater Treatment

Balance


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Estimated Energy Intensity of Water in San Diego County

Relationship of water to energy,broken down

99

56%8%1%5%

30%END USE

WASTEWATERTREATMENT

WATERTREATMENT

DISTRIBUTION

SOURCES ANDCONVEYANCE

Energy Down the Drain, NRDC, August 2004


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Refining Estimates of Water RelatedEnergy Use In California

Indoor uses Outdoor usesNorthernCalifornia

SouthernCalifornia

NorthernCalifornia

SouthernCalifornia

kWh/MG kWh/MG kWh/MG kWh/MGWater Supply &Conveyance 2,117 9,727 2,117 9,727

Water Treatment 111 111 111 111

Water Distribution 1,272 1,272 1,272 1,272Wastewater Treatment 1,911 1,911 0 0

Regional Total 5,411 13,022 3,500 11,111

1010CEC, December 2006


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Residential water energy use

Residential Water Use

%Water Use

Energy for Heating(kWh/AF)

Energy in Distribution,Treatment, wastewater treatment, and Conveyance ,(kWh/AF)

Energy UseTotal(kWh/AF)

%Water-EnergyUse

Toilet 24 0 3,239 3,239 5

Dishwasher 2 36,867 3,239 40,106 5

ClothsWasher 14 36,867 3,239 40,106 34

Shower 21 36,867 3,239 40,106 51

Landscape 40 0 2,424 2,424 5

% Annual Water-Energy Use

100% 82% 12% 100% 100%

1111The interaction of water and energy In California, Lawrence Berkeley National Laboratory, June 12, 2008


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Interaction of Water and Energy

1212

Click to edit Master text stylesSecond level

Third level

Fourth level Fifth level

The interaction of water and energy In California, Lawrence Berkeley National Laboratory, June 12, 2008

Desalinization

Shasta

(storage)


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Visualizing Sustainability

Acceptable Uses for WaterEstablishing priorities

Residential Agricultural Business

tourism Recreation

Change in User Behavior Patterns

Adjust expectations for uses and quantity of waterto correspond to priorities

Provide feedback, show visual link to water use andeconomic health

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Challenges to the City

Efficient /effective use of water Indirect Potable Reuse (IPR)

Recycled water

Stormwater

Rainwater harvestingGraywater

Changing public perception of water,its value and real cost Using less water or using the water you have more efficiently Conservation

Alternative landscaping Edible gardens..minimal lawns

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Whats at Stake?

Water shortages or rationingCreation of unsustainablesystems, leading to water and other shortages for

future generations.Quality of life

Economy?

Food diversity and security?

Energy brownouts .

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Possible Breakthroughs

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Sustainable systems and the relationship betweenwater and energy and earth systems (greenhousegases)

Multiple (hence efficient) use of water for our needs Recycled water

Advanced treated water Graywater use

Recovery of water (hence energy) for other uses . Rainwater capture Re-landscape (contours to capture water) - Stormwater

diversions

Retail market that primarily supports water efficient plants


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Thank You

George J. Adrian , PESan Diego Public Utilities [email protected]

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San Diego isConserving

18180

50000

100000

150000

200000

250000

300000

FiscalYear

Population x

1000

Reduced Water Demand

W

ater De mand in Acre-

feet

san diego water energy nexus shortened version

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