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THE NEXUS OF LEAK DETECTION & ASSET MANAGEMENT
AN INNOVATIVE AND EFFICIENT APPROACH IN SAN MARCOS, TX & SAN JUAN, PR
Wayne Pratt
[email protected] (847) 946-5907
www.wachswaterservices.com
Agenda
• Leak Detection Key Drivers • Methodology • City of San Marcos, TX • City of San Juan, PR • Project Overviews • Conclusions
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Key Drivers to Leak Detection
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Key Drivers: Non Revenue Water
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Key Drivers: Revenue
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Key Drivers: Regulation
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Key Drivers: Drought
San Marcos,
TX
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Key Drivers: NRW (San Juan)
System Input
Volume
598 MGD
(826 Mm3)
Authorized
Consumption
255 MGD
(352 Mm3)
43%
Billed Authorized
Consumption
246 MGD
(341 Mm3)
41%
Revenue Water
246 MGD
(341 Mm3)
41%
Unbilled Authorized
Consumption
8 MGD
(12 Mm3)
1% Non-Revenue Water
351 MGD
(485 Mm3)
59%
Water Losses
343 MGD
(473 Mm3)
57%
Commercial Losses
56 MGD
(77 Mm3)
9%
Physical Losses
287 MGD (396 Mm3)
48%
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Nexus of NRW & Asset Management
Asset
Management
NRW Non Revenue Water
1. Real Water Loss 2. Apparent Water Loss 3. Asset Registry 4. Information Usability
Improvements 5. Asset Usability Analysis
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Leak Survey Methodology • Leak Sounding • Identify areas of
suspected leakage • GPS surface assets • Document asset and
mapping discrepancies
• Populate • Suspect Leak
Features • Survey Line
Features • Survey Point
Features
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• Mobile GIS Platform
• Ipad/Smartphone
collection via Arc GIS
Online
• Ability to view Project
Tracker – Not an Ipad
App.
• Client can view Real
Time Data Collection
Data
Survey Data Capture: Project Tracker
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Survey Data Capture: Project Tracker
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Survey Data Capture: Project Tracker
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Survey Data Capture: Project Tracker
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Survey Data Capture: Project Tracker
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Survey Data Capture: Project Tracker
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Survey Data Capture: Project Tracker
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Survey Data Capture
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Digital Leak Report
LL EE AA KK RR EE PP OO RR TT
ADDRESS
NONE
STREET
YARRINGTON ROAD
CROSS STREET
IH 35 SERVICE ROAD
0 250
Feet
500 q LOCATION NOTES 100 YARDS WEST OF INTERSECTION
MARKED YES
PROJECT SAN MARCOS
FACILITY ID 12198
REPORT No. WWS-000006
REGION SOUTH
COORDINATES
2322319 13894172.7
DATE/ TIME 2/2/2015 2:34:29 PM
CLASSIFICATION 2
STATUS ACTIVE
LEAK TYPE HYDRANT LEAKING
GPM 10
VISUAL WATER YES
PIPE SIZE 6
PIPE MATERIAL DIP
DEPTH
SURFACE COVER GRASS
MANUFACTURER AMERICAN DARLING
ACOUSTIC YES
CORRELATION NO
TECHNICIAN
WACHS WATER SERVICES
FIELD NOTES NONE
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Project Deliverables
• GIS plot of Leak Survey Assets • GIS plot of Confirmed Leaks • Digital Leak Reports with photograph • GIS plot of Asset Defects • GIS plot Mapping discrepancies • Project Summary and Final Report
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City of San Marcos TX
• Population 60,000 • Aquifer water supply • One treatment plant FY
2015 6.24MGD • 200 miles water
distribution • Proactive leak
detection program – every year, multiple years
• Using contracted services
San Marcos
Austin
San Antonio
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Project Scope – San Marcos
• Leak survey • Valve inventory and
assessment • Hydrant inventory
and assessment • GIS updates • Leak location • Leak attributes • Reporting
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Project Area
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Project Overview – San Marcos
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• 75 miles Acoustic Leak
Detection Survey
• 3,742 Survey Points
• Surface asset GPS and
condition
• Identification of asset
& mapping defects
• Delivery of digital leak
reports and asset data
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Survey Results – San Marcos
• 80 documented leaks • 32 leaks not surfacing • 164 gallons / minute • 236,160 gallons / day • 86,198,400 GPY • 130 Olympic Swimming Pools! • $108,609 in savings annually!
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Percentage of Leak by Type - SM
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Volume of Leaks: Type (GPM) - SM
# of assets
sounded
# of leaks
found
Average
GPM of
each leak
Total GPM
of leaks
Total GPD of
leaks
Total GPY of
leaks
Hydrant 580 32 2.8 88 126,720 46,252,800
Meter 2,006 38 1 39 56,160 20,498,400
Service 47 6 5 30 43,200 15,768,000
Valve 811 1 2 2 2,880 1,051,200
Air release/blow off 28 5 2 10 14,400 5,256,000
Main 1 1 1 1,440 525,600
Total 3,472 83 2 170 244,800 89,352,000
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Volume of Leaks: Pipe Material
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Asset Defects - SM
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Asset Defects
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Map Discrepancies
159 Assets
not on GIS
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8 Dams 119 Water Treatment Plants
• Production = 598 MGD
•Capacity = Approx. 650 MGD
52 Wastewater Treatment Plants
• Sewer treated = 244 MGD
More than 3,500 ancillary facilities:
• Water Storage Tanks (1,486)
• Pump Stations (1,778)
• Wells (269)
More than 20.000 miles of pipeline island wide
• Water
• Sewer
5,090 Employees Service Area
3,535 square miles
1,242,465 Clients
Water: 97%
Sewer: 59%
PRASA – Puerto Rico
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The San Juan Project
• 7,000 miles in 18 months
• Metro Region 2,000 miles
• East and North Regions 1,500 miles each
• South and West Regions 1,000 miles each
• Areas Rotated every few weeks
• Surveyed 6,256 miles
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Survey Results – San Juan, PR
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• 2,546 leaks pinpointed, estimated loss 16.9 MGD
• 310 incidents of potential theft identified
• 193,514 survey records (~40 per mile)
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Survey Results – San Juan, PR
Valve Usability Findings
Fire Hydrant – LD Survey
53% not in GIS
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Leak & Gas Pocket Detection
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Non-Tethered Leak & Gas Pocket Detection
• Launch & Retrieve in Live Flow Through 4-inch Access
SmartBall Acoustic Leak & Gas Pocket Detection
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Sahara Deployment
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Sahara Deployment
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Medium Resolution Electromagnetics
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Leak & Gas Pocket Detection
Over 70% of all gas pockets detected in force
mains are not at known high points.
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Nexus of NRW & Asset Management
Asset
Management
NRW Non Revenue Water
1. Real Water Loss 2. Apparent Water Loss 3. Asset Registry 4. Information Usability
Improvements 5. Asset Usability Analysis
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Conclusions
• Efficient Leak Detection Process • External – Small Diameter • Internal – Large Diameter
• Water Loss Reduction • Revenue Recovery • Accurate Data Collection • Improved Asset Inventory • Updated Mapping Records
