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SB 555: Water Loss Performance Standards
Public Stakeholder Workgroup Meeting #3
Summary of Prior MeetingsKartiki Naik
State Water Resources Control Board
September 17, 2018
Senate Bill 555 (2015)
Life Cycle Cost AssessmentCalifornia Environmental Quality Act
https://water.ca.gov/-/media/DWR-Website/Web-Pages/Programs/Water-Use-And-Efficiency/Urban-Water-Use-Efficiency/Files/Water-Loss-Audit-Regulations-March-2018.pdf
Water Loss TAPIn-person work
sessionIn-person work
session
Practice validation session
Teleconference validation session
Wave 1 Wave 2 Wave 3 Wave 4
73 workshops total | 385 Urban Water Retailers | Participation of 1500+
Resources from the TAP:http://www.californiawaterloss.org/resources
Water Audit Validator: List of certified individualshttp://ca-nv-awwa.org/canv/downloads/2018/WAVSpreadsheet8.16.18.pdf
TAP report available at:http://ca-nv-awwa.org/canv/CNS/Water_Loss/CNS/Partnership_for_Saving_Water/collaborative.aspx?hkey=3a17ed12-55d4-4488-8907-2490e027786b
Making Audits Actionable
High variability inwater loss estimates
Metering, data-logging and meter testingRetailers: Own sources, Exported water
Wholesalers: Exported water
Testing & record-keeping: Metered distributed water
Monitoring operating pressure for zones
Best Management Practices and Challenges
Larger utilities:Develop task force
Measure system input volume at end of treatment train
Prorating of data in billing system
Representative sampling for meter testing
Steering away from percentages
Water loss as a tool to organize structure of utility
Production meter accuracy
Supply variations
Fiscal v/s Calendar reporting
Consistency in reporting
Establish regional collaboration
Accommodate for a degree of uncertainty
Performance Indicators and System Data
Pressure
Real Loss Reduction MeasuresAge
Material
Small v/s Large Pipes
VolumetricIndicators
Water loss improvement steps
Suggested Workshop Items
• Case studies: Benefit-cost analysis and decision making by a utility
• Water loss control programs: Best Management Practices and pointers on how to advance them
• Costs of different interventions and technologies for water loss control
• Information on controlling water loss in addition to pressure management
• Research projects
Real Loss InterventionsDetection
AcousticProbesGround
microphoneCorrelators Loggers Transmitters
Inline leak detection
CameraPressure-basedAcoustic
Tracer gas detection
Ground Penetrating RadarImaging
In-pipe methods
Quick response to repairs and improved recording
East Bay Municipal Utility District:Asset Management Strategies
Cast Iron
Asbestos Cement
Steel
Likelihood and Consequence
Pressure Management
+ Pressure reduction valves
+ Booster stations
Operational Pressure Reduction
District Metered Areas/Pressure zones
Pressure v/s LeakagePressure v/s BreaksLeakage volume and location
Surge Monitoring and Control
Control
Operational changes Avoid rapid closing and opening of valves
Retrofits/InstallationsFlywheel
Correct level controls for tanks/reservoirs
Surge tanks Relief valvesDivert excess water/pressureSlow down pump
responses
Pressure measurements
Transient detectionPressure Loggers
(different types)
Instruments
Monitoring
Back up pumpTo avoid sudden flow cut-off
Hydrants• Tested for flow rate based on lowest
pressure reached in operation
• Required residual pressure of 20 psi
Fire Flow Requirements
Fire sprinkler systems• Vary with occupancy and building
• Insurers rate building based on compliance with required flow
References: American Water Works Association M31, M17 and National Fire Protection Association 291 Fire Suppression Ratings Schedule: Insurance Services Office (Verisk Analytics)
Implementation
Unavoidable Real Loss
Speed and Quality of
Repairs
Active Leakage Control
Potentially Recoverable
Economically Recoverable
Pressure Management
Asset Management
Constraints for Implementation
High cost per connection
Pipe material Soil typeHigh proportion of CII use
Pipe size
Agenda
Life Cycle Cost Assessment
Avoided cost of water
Water Loss Control Programs:
• Los Angeles Department of Water & Power
• Irvine Ranch Water District
Installation Maintenance
Monitoring/Planning
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