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