john sutton: water loss from a state perspective, twca fall conference 2015
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The statements contained in this presentation are my current views and opinions and are not intended to
reflect the positions of, or information from, the Texas Water Development Board, nor is it an indication of any
official policy position of the Board.
Who Submits Audits?All retail public water suppliers - about 3,500
Submit a Water Loss Audit every 5 yearsWere due May 1, 2011 and again May 1, 2016
Annual reporting:TWDB loan recipients beginning May 2013 Entities with more than 3,300 connections beginning
May 2014
What Is A Water Loss Audit?A "top down" audit or a "desktop" exercise
using existing estimations and recordsUses information on system input volume;
authorized use; reported leaks and breaksSeparates uses and losses into practical
categoriesConnected to the Water Use Survey
Certain data self-populatesNumerous lines are auto-calculated
How Is An Audit Conducted?Consistent and standard terms-TWDB
methodology based on American Water Works Association guidelines
“Unaccounted for water” is no-longer usedAnswers the following questions:
Where was water lost?How much water was actually lost? (VOLUME)What was the value of that water? ($)
Why Is Water Loss ImportantTo The Utility?Inefficient use of available water resources
supply side conservationRevenue and cost management!Properly tracking apparent loss
increase revenuedecrease rate increase frequency
Recovery of real lossescost-effective compared to new waterdiminished need to search for new waterunnecessary investments in new facilities
Why Is Water Loss ImportantTo The State?Inefficient use of available water resources
supply side conservationData is provided to regional water planning groups
for consideration in developing water management strategies
Conservation staff can contact and offer assistance to selected utilities
Data is used in review and approval of TWDB loan applications for water projects
Significant Data
Accuracy of production metersAccuracy of customer metersVolume of billed, unbilled, metered, unmetered
authorized usesVolume of reported breaks and leaks“Unreported loss” is residual after all above
estimates are enteredUtility’s cost for produced water and retail cost of
water to customers
2014 Results419 “completed” audits were submittedAuthorized consumption was 88.2 percent of
input volumeTotal “Water Loss” was 11.8 percent of input
volumeSeparating water loss:
Apparent loss was 2.3 percent Customer meter accuracy
Real loss was 9.5 percent Reported breaks and leaks loss was only 1.3 percent “Unreported loss” was 8.2 percent
Statewide Total Billed Metered
653,744,067,099
419 Audits Submitted Billed Consumption 82.3% Revenue Water
656,060,842,995 Billed Unmetered 656,060,842,995
82.6% 2,316,775,896 82.6%
Authorized Consumption 0.3%
700,257,384,937 Unbilled Metered
88.2% 19,538,789,656
Unbilled Consumption 2.5%
44,196,541,942 Unbilled Unmetered
5.6% 44,196,541,942
System Input Volume 3.1%
794,216,514,565 Unauthorized Consumption
2,334,276,213 Non-revenue Water
0.3% 138,155,671,570
Apparent Loss Customer Meter Accuracy Loss 17.4%
18,522,006,804 15,476,584,143
2.3% 1.9%
Water Loss Systematic Data Handling Discrepency
93,959,129,628 719,401,198
11.8% 0.1%
Reported Breaks and Leaks
10,196,832,705
Real Loss 1.3%
75,437,122,824 Unreported Loss
9.5% 65,240,290,119
8.2%
Results by Size of UtilityUtilities with less than 10,000 population
16.7 percent total water loss Utilities with population between 10,000 and
49,99911.2 percent total loss
Utilities with population between 50,000 and 99,99911.0 percent total loss
• Utilities with a population of more than 100,000• 12.0 percent total loss
The Cost of Water Loss
Apparent loss is water that should have resulted in revenue to the utilityMedian loss – $40,851
Real loss is treated water that was not available for sale or useMedian loss - $75,434
Key Water Loss IssuesData validationPoor records and asset managementInsufficient leak detection, repair, reportingNot being proactive in reducing lossLack of funding/revenue for maintenance and repair
of aging or damaged infrastructure
Lessons & EnhancementsAll water volumes entered in gallonsImprove wording and examples in the
instructionsMore pop-up comments/hints on the worksheetImprove ability to log into the secure database to
complete the worksheetWater Use Survey and Water Loss AuditProduction versus treatedWholesale volumes
Water Loss ThresholdsReviewed for retail public water suppliers with application for financial assistance for water projectsApparent Loss
Customer meter accuracy of 95 percentReal Loss
More than 10,000 population – 3 times unavoidable annual real loss
10,000 population or less & 32 connections or more per mile – 50 gallons per connection per day
10,ooo population or less & less than 32 connections per mile – 1,600 gallons per mile per day
ResourcesTechnical resources
for implementing a water loss program Leak Detection Equipment Workshops and training
Financial resourcesConservation and water loss are eligible for financial
assistanceThresholds for water loss
www.twdb.texas.gov
Future DatesMarch 1, 2016
2015 Water Use Survey
May 1, 20162015 Water Loss Audits
All retail public water suppliers
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