Sustainable Urban Water Use - University of North Carolina
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Transcript of Sustainable Urban Water Use - University of North Carolina
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Sustainable Urban Water Use
Engaging leaders in the Southeast to integrate water conservation into
the utility business model
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The RBC Blue Water Project is a wide-ranging, multi-year program to help foster a culture of water stewardship, so that people have clean fresh water today and tomorrow.
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Dedicated to enhancing the ability of governments and organizations to provide environmental programs and services in fair, effective and financially sustainable ways
Serving EPA Region 4
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Format and Agenda for the Day
Why Conservation Planning Mary Tiger, EFC
Using Planning Tools to Project Costs and Benefits Bill Christianson, AWE
Driving Efficiency Through Price Shadi Eskaf, EFC
Combining Price and Non-Price Programs: A New Business Model for the Utility
Mary Tiger, EFC
Continuing the Dialogue Group
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Racking Up the Savings: Planning and Evaluating
Cost-Beneficial
Water Conservation Programs
Bill Christiansen
Program Planner
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10 Steps in Conservation Planning
1. Identify conservation goals
2. Develop a water use profile and
forecast
3. Evaluate planned facilities
4. Identify and evaluate conservation
measures
5. Identify and assess conservation
incentives
Source: Handbook of Water Use and Conservation: Homes, Landscapes, Businesses, Industries,
Farms by Amy Vickers (WaterPlow Press, 2001), pp. 2-3. Used by AWE with permission of author.
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10 Steps in Conservation Planning
6. Analyze benefits and costs
7. Select conservation measures and
incentives
8. Prepare and implement the
conservation plan
9. Integrate conservation and supply
plans, modify forecasts
10.Monitor, evaluate, and revise
program as needed
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A Graphic View
Draft Water Efficiency Implementation
Plan
Formulate Draft Water Efficiency Programs
Develop Evaluation Criteria
Evaluate Efficiency Programs,
Prioritize Options
Data Collection ID Conservation Measures
Analyze Water Demand Screen Measures
Delivery Mechanisms
Economic Analysis
Stakeh
old
er Invo
lvemen
t
Source: A & N Technical Services, Inc.
AWWARF Project 2935: Water Efficiency Programs for Integrated Water Management
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So Why Another Model?
Need for consistent and thorough analysis of
cost-effective water conservation options
Tools exist in various forms
Most are proprietary
AWE wanted robust but easy to use model
with transparent code
The Home Depot Foundation funded partial
development
“Tracking Tool” for savings as well as
analytical tool for planning
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Tracking Tool Uses
Analyze potential water savings, costs, and
benefits of conservation measures
Construct water conservation portfolios and
long-range plans
Rank conservation measures
Track implementation, water savings, and
costs
Predict revenue impact
Track and graph the benefits of actual
conservation activities over time
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Tracking Tool Features
Runs in Excel 2002/03 or later version
Flexible Representation of Water Savings
Library of 25 Pre-Defined Conservation
Measures
Demand and Avoided Cost Analysis
Simple User Interface
Dynamic Tables, Charts, and Forms
Switch Between English or Metric Units
Scenario Management
Detailed User Guide
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Tracking Tool Inputs and Outputs
Model Outputs Savings Analysis Benefit-Cost Analysis Revenue/Rate Impacts
Conservation Measure Data
System Avoided Cost
Data
Baseline Demand Data
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Model Navigation Worksheet
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Common Assumptions
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Baseline Demands
Two Data Entry Options
o Enter or link to an existing demand forecast
o Use model to grow current demand by population
Plumbing/Energy Code Adjustment
o Model can adjust for impact of existing
plumbing/energy codes as necessary
Demand Disaggregation
o Peak/Off Peak Seasonal Demands
o Customer Class Disaggregation
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Avoided Costs
Two Data Entry Options
o Enter or link to an existing avoided cost forecast
o Use model’s avoided cost calculator
Model’s Avoided Cost Calculator
o Short-run avoided O&M
• Water Supply
• Wastewater Treatment
o Long-run avoided or deferred capacity
• Calculates present value of delaying and/or
downsizing peak season capacity expansion
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Capacity Deferral Analysis
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Setting Up Conservation Measures
Two Specification Options
o Build from scratch
o Import pre-defined measures from library
o Pre-defined measures can be customized
Library currently includes 25 measures
o 13 residential measures
o 8 CII measures
o 4 large landscape measures
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Defining a New Conservation Measure
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Importing a Library Measure
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Entering Annual Activity Levels
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Activity Savings Profile Worksheet
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Benefit-Cost Analysis Tabular Output
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Assessing Water Loss Control
Important to include water loss control
methods in model analysis
Detailed modeling necessary to incorporate
individual water loss control strategies for a
specific utility
Insufficient funding available for first
version of model to do this
Wanted to benchmark water loss control
strategies against demand side
management strategies
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Model Assumptions
Default assumption that 65% of total water
losses are real losses and 35% are apparent
losses. This default assumption can be
modified by the user
Default assumption that an aggressive water
loss reduction program would, for a typical
utility, reduce real losses by 20 - 40%
Model compares this savings potential to
program water savings from demand side
conservation activities defined in the model
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Physical Loss Reduction Comparison
0
200
400
600
800
1,000
1,200
2008
2010
2012
2014
2016
2018
2020
2022
2024
2026
2028
2030
2032
2034
2036
2038
2040
2042
2044
2046
2048
2050
2052
2054
2056
2058
2060
2062
2064
2066
Year
AF
Program Water Savings 20% Loss Reduction 40% Loss Reduction
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Benchmark Examples (in AF)
San Francisco PUC $439
Nashville Water Works $318
Los Angeles Dept. of Water and Power $347
California Grant Program $658
Las Vegas WD $464
Large Western US Utility $318
Orange County Utilities, FL $463
Average $430
Maximum $658
Minimum $318
Source: Julian Thornton and Reinhard Sturm
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Benchmarking Water Loss Control
Conservation Activities Sorted by Utility Unit Cost
$- $100 $200 $300 $400 $500 $600 $700 $800 $900
Residential Surveys, SF
CII HE Toilet
Water Loss Control - High*
Residential HE Toilets, SF
Water Loss Control - Low *
Residential Irrigation Controller, SF
Unit Cost ($/AF)
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-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030
Ch
an
ge in
Reven
ue R
eq
uirem
en
t (JD
) Millio
ns
Year
Impact to Utility Sales Revenue Requirement
Change in Annual Revenue Requirement Annualized Change
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Beta Testing the Model
Four US utilities tested the model:
Seattle, San Antonio, Tampa Bay, Marin
Municipal Water District
Model now finalized with results from
beta testing
Version 1.2 now available in Excel
Future versions will add to library of
conservation measures
Detailed water loss evaluation
component will be added
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Availability of Model
Available free to members
AWE agrees to provide free all future
updates and one free hour of technical
assistance
Version 1.2 released last month with new
features and corrections
International applications (Jordan,
Australia, Italy)
Collecting case studies of user
experiences
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Observations Since Model Release
Data inputs must be correct on avoided
costs and system expansion needs
Utility conservation costs must be correctly
estimated
Utility overhead not double-counted
Savings of 15-30% reasonably likely
depending upon avoided costs
Users are able to create and customize
California highest activity to date (due to
state planning requirements)
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Examples of Water Utility Planning
CA: CA Water Service Co. (26 systems)
CA: Ontario region
CA: City of Oxnard
CA: San Jose Region
CA: West Basin Region
CA: Apple Valley
CO: Westminster
GA: Statewide estimates underway
TX: SAWS, Austin, Montgomery County
Australia: Melbourne Region
Jordan: Countrywide with all 3 utilities
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