water loss control in los angeles · 17/09/2018 · tank drop test 01 23 4 testing program years...
TRANSCRIPT
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Water Loss Control in Los Angeles
Sofia Marcus MS,PE,D2,WAVSeptember 2018
Presentation Agenda
1. Water Loss Control Program Background
2. Improving Data Validity and Targeting Apparent Losses
3. Targeting Real Losses
4. Data Trends & ProgramConclusions
2
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Program History
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Water Loss Control Program History
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2010-2011 Water Loss Audit and Component Analysis
State regulatory requirements
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Water Loss Task Force Action Plan
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1. System Input Volume
2. Database Management
3. Meter Testing and Replacement
4. Leak Detection and Prevention
5. Unmetered and Unauthorized Consumption
www.ladwp.com/waterconservation
Sources of Supply
6
State Water Project
LA Aqueduct
Colorado River Aqueduct
Local Groundwater, Stormwater, Conservation & Recycling
6
LA Aqueduct
58%
GroundWater9%
MWD Imports31%
Recycled Water2%Wet Year
LA Aqueduct
10%
GroundWater13%
MWD Imports75%
Recycled Water2%Dry Year
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Data Validity and Apparent Losses
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Supply Meter Preventative Maintenance
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67 LADWP supply metering devices, including:
Flow Meters and Totalizers
Pressure Transducers, Cells, and Floats
35 flow meters at MWD connections
Develop Preventative Maintenance Program for Annual Calibration & Maintenance
Meter Types:
Venturi
Magnetic
Ultrasonic
Propeller
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0 1 2
Calibration andMantenance
Years
Preventative Maintenance Program
Planning Annual Implementation
Preventative Maintenance Program Cost
9
Maintenance and Calibration Program
Costs
One Time Costs $280,000
Ongoing Costs $233,000
Total Program Costs $513,000
10
How does this benefit the city of Los Angeles?
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Supply Meter Accuracy Testing
FlowMeter
FlowMeter
1
In-Place Comparative Test
2
FlowMeter
1
Tank Drop Test
0 1 2 3 4
Testing Program
Years
Source Meter Testing Program
Planning Annual Implementation
Meter Accuracy Testing Program Costs
12
Testing Program Costs
One Time Costs $ 218,000
Ongoing Costs $273,000
Total Program Costs $491,000
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13
How does this benefit the city of Los Angeles?
Customer Meter Accuracy Improvements
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Bench testing 1,000+ small meters annually
Goal to replace 30,000 small meters annually
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Customer Meter Testing Program Costs
15
Meter Testing Program Costs
One Time Costs $146,000
Ongoing Costs $513,000
Total Program Costs $ 659,000
0 1 2 3
MeterTesting
Program
Years
Meter Testing Program
Planning Annual Implementation
16
How does this benefit the city of Los Angeles?
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Customer Meter Replacement Costs
17
Small Meter Replacement Program
Costs
One Time Costs $34,000
Ongoing Costs $6,362,000
Total Program Costs $6,396,000
0 1 2
MeterReplacement
Program
Years
Meter Replacement Program
Planning Implementation
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How does this benefit the city of Los Angeles?
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Cost Summary
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Implemented Actions One Time
CostsOngoing
CostsBenefits
Meter Calibration $280,000 $233,000 Improves DVG
Supply Meter Accuracy Testing $218,000 $273,000 Improves DVG
Customer Meter Testing $146,000 $513,000 Maintains DVG
Customer Meter Replacement $34,000 $6,396,000 Apparent Losses
Total Costs $678,000 $7,415,000
Real Losses
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LADWP’s Water Distribution System
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473 square miles
7,327 miles of mains
737,583 services
111 Pressure Zones
60,804 Hydrants
1,320 AF of water delivered per day
4 million people served
Supplied Water 94%
Real Losses
6%
Real Loss Component Analysis Results
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Majority is background leakage:
Pressure management Infrastructure renewal and
rehabilitation
Reported breaks: Reduce response time
Some potential to reduce hidden losses:
Active leak detection
Reported Breaks,
23%
Hidden Losses,
13%
Background Leakage,
64%
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Increased Mainline Replacement
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Mainline Replacement Program
Costs
Annual Program Cost $260 Million
11893
116 119 113
170 184216
232249
266283
300
0
50
100
150
200
250
300
350
FY 1
0-11
FY 1
1-12
FY 1
2-13
FY 1
3-14
FY 1
4-15
FY 1
5-16
FY 1
6-17
FY 1
7-18
FY 1
8-19
FY 1
9-20
FY 2
0-21
FY 2
1-22
FY 2
2-23
Leng
th o
f Mai
n in
Tho
usan
d Fe
et
Mainline Replacement
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How does this benefit the city of Los Angeles?
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Pressure Monitoring & Hydraulic Modeling
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Pilot began in December 2016
Evaluating various technologies
Targeting 13 leakiest zones
Pressure Monitoring & Modeling Costs
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Pressure Monitoring Phase 1 Costs
One Time Costs $5,500,000
Ongoing Costs $2,100,000
Total Annual Costs $7,600,000
0 1 2 3 4 5 6 7 8 9 10 11
PressureLogger
Program
Years
Pressure Logger Program Phase 1
Planning (Phase1) Pilot Phase 1 Planning (Phase 2) Pilot Phase 2
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Pressure Management: Phased Approach
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Install Pressure Loggers
Monitor and Review Data
Input Data into a Hydraulic Model
Model Impact of Pressure Changes
Step 1 Step 2 Step 3 Step 4
Step 5
28
How does this benefit the city of Los Angeles?
Total Supplied Volume
94%
Background Losses
64%
Reported Breaks 23%
Hidden Losses
13%
Real Losses6%
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Leak Detection Pilot Program
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Pilot Project Objectives Verify Accuracy and
Effectiveness
Evaluate Ease of Use
Evaluate Large Scale Deployment
Evaluate Multiple Technologies Fixed leak detection and
monitoring
Manual leak survey
Leak Detection Pilot Program Cost
30
Fixed leak detection Costs
One Time Costs $304,000
Ongoing Costs $720,000
Total Annual Costs $1,024,000
Manual leak survey Cost
One Time Costs $20,000
Ongoing costs $175,000
Total Annual Costs $195,000
0 1 2 3 4
FixedLeak
Detection
Year
Fixed Leak DetectionPlanning Pilot Phase Evaluate Pilot
0 1 2
ManualLeak
Survey
Year
Manual Leak SurveyPlanning Annual Implementation
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Leak Detection: An Emerging Technology
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Pros Identifies leaks
Easy to operate
Good user interface
Cons Cannot determine the size of
the leak
Too many false positives
Theft is prevalent
Installation can be difficult
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How does this benefit the city of Los Angeles?
Total Supplied Volume
94%
Background Losses
64%
Reported Breaks 23%
Hidden Losses
13%Real Losses6%
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Maximum Theoretical Savings
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Reported Breaks, 23%
Hidden Losses, 13%
Background Leakage, 64%
Water Savings: 19,000 AFRevenue Savings: $25 million
Water Savings: 4,000 AFRevenue Savings: $5 million
Water Savings: 7,000 AFRevenue Savings: $9 million
Cost Summary
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Implemented Actions One Time
CostsOngoing
CostsBenefits
Mainline Replacement - $260,000,000 Real Losses
Pressure Management $5,101,000 $2,109,000 Real Losses/Background Losses
Leak Detection Phase 1 $304,000 $720,000 Real Losses/Hidden Losses
Leak Detection Phase 2 $20,000 $175,000 Real Losses/HiddenLosses
Total Costs $5,425,000 $263,000,000
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Data Trends & Program Conclusions
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0.0%
2.0%
4.0%
6.0%
8.0%
10.0%
12.0%
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
2000
2002
2004
2006
2008
2010
2012
2014
2016
Percent of Total Potable Water U
seNon
-reve
nue
Wat
er, a
cre-
feet
Fiscal Year Ending June 30
Los Angeles Non-Revenue Water Trends Non-revenue Water Percent of Total Potable Water Use
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National Trends: Real Losses
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25
30
35
40
45
50
55
60
2013 2014 2015 2016 2017
Rea
l Los
s Pe
r Con
Per
Day
WADI
WADI= Water Audit Data Initiative, American Water Works Association
25
30
35
40
45
50
55
60
2013 2014 2015 2016 2017
Rea
l Los
s Pe
r Con
Per
Day
WADI Georgia
25
30
35
40
45
50
55
60
2013 2014 2015 2016 2017
Rea
l Los
s Pe
r Con
Per
Day
WADI Georgia CA Audit
Recommendations: Phased Approach
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Cost Effective
Water Savings
Phase 1 Phase 2
Phase 3
