Transcript Document

Creating a Sustainability Index for
Water Planning in Southern California
Presented at:
AWWA ACE-09
June 18, 2009
Dan Rodrigo
Vice President
CDM
523 West Sixth Street, Suite 400
Los Angeles, CA 90014
What is Sustainability?
Finding the right balance between economic,
environmental and social needs
Taking a holistic, interconnected perspective
Consideration of the
long-term
Environment
Economic
Social
Why is Sustainability Important in
Water Supply Planning?
With limited resources, its critical to consider
multiple benefits
Stakeholder involvement in decision-making
requires new paradigm
Economic
Sustainability is reliability
Reliability
Environment
Social
Understanding the Water Cycle…
In the past, cities developed new water supplies
often from far distances, discharged wastewater
into receiving waters, and diverted stormwater
away from city into receiving waters.
Water
Supply
Wastewater
Receiving
Waters
dry
weather
Stormwater
wet
weather
Integration of Water Resources Leads
to Sustainability
Sustainable cities will reuse wastewater, reduce
stormwater and find ways to beneficially reuse it,
and reduce the need for importing water supplies
— in other words become more self-sufficient.
Beneficial reuse of stormwater
(e.g., groundwater recharge)
Water
Supply
Wastewater
dry
weather
Stormwater
Reduced flows
from BMPs
Reuse of treated
wastewater
Receiving
Waters
wet
weather
Traditional Economic Comparison of
Water Supply
Cost of Water
Cost of Water Treatment
Cost of Conveyance
Expanded Cost View (Source to
Disposal)
Cost of Water
Cost of Water Treatment
Cost of Conveyance
Cost of Wastewater Treatment
Cost of Disposal (Outfall)
Sustainability Goes Even Further …
Cost of Water
Cost of Water Treatment
Cost of Conveyance
Cost of Wastewater Treatment
Cost of Disposal (Outfall)
Reliability & Adaptability
Environmental Impacts
Societal Preferences
Major Imported Water
Systems for Southern CA
Lake Oroville
San Francisco
Mono Lake
State Water Project
Los Angeles
Aqueducts
Colorado River
Aqueduct
Los
Angeles
San Diego
Lake
Mead
Creating a Sustainability Index for
Water Supply in So. California
Water Supply Options:
New State Water Project
Supply
Groundwater Recovery
(Brackish Desalination)
Seawater Desalination
Traditional Recycling (Tertiary)
Advanced Recycling (MF/RO
for indirect potable)
Conservation (Smart Irrigation)
Urban Runoff Reuse
Data from the following CDM
Water Supply Studies and IRPs:
• City of San Diego
• City of Los Angeles
• Rancho California WD
• Eastern MWD
• Western MWD
Supply Options Evaluated at the
Margin
Projected
Water Demands
Margin
Existing Local Water Supplies
Existing Imported Water Supplies
2005
2010
2020
2030
SWP
Supply
300 miles
of conveyance
Tracking Water Supply from
Source to Disposal Using
Systems Model
W
Treatment
Indoor
Use
WW
Treatment
Outdoor
Use
~20% of
Outdoor use
Outfall
Receiving
Waters
Urban
Runoff
SWP
Supply
300 miles
of conveyance
W
Treatment
Tracking Water Supply from
Source to Disposal Using
Systems Model
GW Recovery or
Seawater Desal
Indoor
Use
Reduces imported
water and regional
treatment costs, and
reduces CO2 emissions
or is CO2 neutral
Outdoor
Use
~20% of
Outdoor use
WW
Treatment
Brine line
Outfall
Receiving
Waters
Urban
Runoff
SWP
Supply
300 miles
of conveyance
Tracking Water Supply from
Source to Disposal Using
Systems Model
Reduces imported
water and regional
treatment costs, and
significantly reduces CO2
emissions
W
Treatment
Indoor
Use
Outdoor
Use
Traditional
Recycled
WW
Treatment
~20% of
Outdoor use
Outfall
Reduces costs for outfall
and reduces flows to
receiving waters
Receiving
Waters
Urban
Runoff
SWP
Supply
300 miles
of conveyance
Tracking Water Supply from
Source to Disposal Using
Systems Model
Reduces imported
water and regional
treatment costs, and
significantly reduces CO2
emissions
W
Treatment
Indoor
Use
WW
Treatment
Outdoor
Use
~20% of
Outdoor use
Urban
Runoff
UR
Treatment
Improves water quality
going to receiving waters
Outfall
Receiving
Water
SWP
Supply
300 miles
of conveyance
Tracking Water Supply from
Source to Disposal Using
Systems Model
Reduces imported
water and regional
treatment costs, and
significantly reduces CO2
emissions
W
Treatment
Indoor
Use
WW
Treatment
Outdoor
Use
<10% of
Outdoor use
Smart
Irrigation
Urban
Runoff
Improves water quality
going to receiving waters
Outfall
Receiving
Waters
True Cost of Supply Options
1800
Unit Cost ($/AF)
1600
1400
1200
1000
800
Disposal
Wastewater
Water
600
400
200
0
* Including surface treatment
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Drought Proofing
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Habitat Impacts
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Preference (5 = best, 1 = worst)
Societal Preference
5
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Creating the Sustainability Index
Uses technique called multi attribute rating
(Criterium Decision Plus software)
CDP Software Ranks Options & Shows
Trade-Offs
How Supply Options Rank
Water Cost
Expanded Cost
Sustainability
1
Traditional
Recycled
Conservation
Conservation
2
SWP Supply
Traditional
Recycled
Traditional
Recycled
3
Conservation
Urban Runoff
Reuse
Groundwater
Recovery
4
Groundwater
Recovery
SWP Supply
Urban Runoff
Reuse
5
Advanced
Recycle
Advanced
Recycle
Advanced
Recycle
6
Seawater
Desalination
Groundwater
Recovery
Seawater
Desalination
7
Urban Runoff
Reuse
Seawater
Desalination
SWP Supply
Conclusions
Expanding costs to include wastewater and
disposal gives a more accurate view of the
economic impacts
But only when you add all sustainability
indicators do you get the full comparison
Do the results mean that Southern California
should abandon its SWP supply?
Of course not! All other options cannot meet
both marginal demands and replace existing SWP
supply; but these other options at the margin
have merit and should be examined seriously
QUESTIONS ?