Leak Detection

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Leak Detection

• Andy Brogden
• Water Distribution Superintendent
• City of Raleigh

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Once Upon a Time
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Goals for Today

• Discuss cost benefits of leak detection
• Discuss water savings
• Look at equipment currently used
• Review Raleighs procedures
• Discuss other types of equipment
• Discuss other non-conventional methods

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Cost/Benefits

• Asphalt Repair
• Liability
• Treatment
• Time
• Customer Confidence

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Asphalt Repair

• Knowing where to excavate eliminates unnecessary
  asphalt/concrete repairs
• Replacement costs are approximately
  11.00/sq.ft.
• Cost for an average 5 deep excavation would be
  2500

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Liability

• Finding concealed leaks reduces liability by
  minimizing the chances of sinkholes, washouts,
  etc.
• Also reduces chances of back-siphonage during
  unscheduled repairs

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Treatment Costs

• Reducing unaccounted-for-water lowers treatment
  costs.
• EXAMPLE WTP production 3.5 MGD _at_ .75per 1000
  gal
• Total UAW 45 or 1.575 MGD
• Inaccurate Meters 20 or .7 MGD
• Leaks 13 or .455 MGD
• UAW Afterwards 12 or .42 MGD

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Leaks cost lots of money regardless of size!
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TIME

• Dealing with Customer complaints about high bills
• Explaining to Council, why you need for OT,
  or more employees
• Time spent on emergency repairs when a good
  Detection Program could have made it a PLANNED
  REPAIR

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Customer Confidence

• Inquisitive customers WILL ask employees to
  explain.
• Shows that we are being good stewards of City
  monies and the environment
• Customers that have confidence in their Water
  Provider are less likely to complain about high
  bills
• More likely to approve bonds for improvements

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Leak Detection Procedures
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Different Mics
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CORRELATORS
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Different Correlators
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NON-Conventional Methods