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rye. leak detection 931-289-2300. A PRACTICAL APPROACH TO WATER AUDITS AND LEAK DETECTION. Presented By:. R. RYE ENGINEERING PLC Consulting Engineers & System Operators. Friday, March 15, 2013. Leak Detection Services. RYE ENGINEERING PLC Consulting Engineers & System Operators

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  1. rye leak detection931-289-2300

  2. A PRACTICAL APPROACH TO WATER AUDITS AND LEAK DETECTION • Presented By: R RYE ENGINEERING PLC Consulting Engineers & System Operators Friday, March 15, 2013

  3. Leak Detection Services RYE ENGINEERING PLC Consulting Engineers & System Operators 4210 West Main Street Erin, TN 37061 Phone: (931) 289-2300 Fax (931) 289-2313

  4. Experience and Qualifications • Mike Sheppard, Senior Project Manager • Water Distribution Manager CGW (Retired) • 35+ Years of Experience • Utility and Construction Background

  5. Why is Leak Detection Important? • TN Comptroller’s Office • After January 1, 2013 • All Water Audits in AWWA Format • Reduce “REAL LOSSES”

  6. AWWA Water Balance

  7. Real Losses

  8. Real Losses • Water Main Leakage Service Line Leakage

  9. Apparent Losses Encountered

  10. Practical Approach to Water Audits • Useful in Before Leak Detection • TOP DOWN Approach • Pre-Audit Survey – Not Perfect

  11. Who Can Help with Water Audit? • TAUD – Classes, Circuit Riders • Engineering Consultant • Leak Detection Consultant

  12. Why Perform a Water Audit? • Because Comptroller says so • It’s the law • It may actually be useful • All of the above

  13. How Can a Water Audit Help with Leak Detection? • Quantifies Leakage • Calculates Realistic Leakage Reduction Goals • Answers: Is leak detection worth it?

  14. What Type of Audit Should I Do? • TOP DOWN WATER AUDIT • Use AWWA Software • AWWA M-36

  15. TIPS for TOP DOWN initial AUDIT • Keep it simple • Don’t search endlessly for data • Set a time deadline (1/2 day)

  16. TIPS for TOP DOWN initial AUDIT • Pull out last financial annual audit • Get out your latest water loss calculation sheet from old method • Use information from the same FY • GET STARTED!

  17. What Information is Needed for a Quick, Top Down, Water Audit? • Distribution System Information • Financial Data • Operational Data • Water Balance Inputs

  18. Distribution System Information • Miles of Transmission Main • Number of Service Connections • Average Operating Pressure

  19. Financial Data • Total Costs to Operate Water System ($) • Retail Water Rate ($ per MG) • Cost to Produce Water ($ per MG)

  20. Water Balance Inputs • MAJOR COMPONENTS • Water Produced from WTP • Water Purchased • Water Billed and Metered to Customers

  21. Water Balance Inputs • Other Components • DON’T GET HUNG UP ON THESE • Unbilled Authorized Consumption • - Flushing, Fire Dept, Gov’t uses, etc. • Validities – Calibration Schedules, etc.

  22. Water Balance Inputs • Minor Components • DON’T GET HUNG UP ON THESE either • Adjustment for Meter Error (if known) • Adjustment for Tank Level Difference - (1st Day vs. Last Day of Year) • Other Adjustments

  23. Water Balance Inputs • Apparent Losses – • Mistakes, Inaccuracies • NOT LEAKS • Most Important = Meter Inaccuracies

  24. Water Balance Inputs • Let’s look at the AWWA Audit Software……. • Southern Middle TN Community Example Water System - BEFORE LEAK DETECTION.xlsx

  25. What Outputs are Useful for Leak Detection? • NRW – Non-Revenue Water • CARL – Current Annual Real Losses • UARL – Unavoidable Annual Real Losses • ILI – Infrastructure Leakage Index

  26. NRW Non-Revenue Water • Don’t Say “Unaccounted For Water” ANYMORE! • NRW by % of Supply - Traditional • NRW by % of Operating Costs – REPORT TO COMPTROLLER

  27. Non-Revenue Water

  28. CARL Current Annual Real Losses • Total Water Leaking from System (MG) • Calculated Value (not input data) • CARL/day or CARL/minute – gpm

  29. UARL Unavoidable Annual Real Losses • May we call him “Earl”? • Leakage that cannot be reasonably eliminated (MG) • “UAre Really Low”

  30. UARL Unavoidable Annual Real Losses • UARL/day or UARL/minute – gpm • Target Number?

  31. The CARL and UARL Relationship • CARL and UARL are brothers • We are parents • UARL is perfect • CARL is not • Our Goal: CARL to be more like UARL

  32. ILI Infrastructure Leakage Index • CARL divided by UARL • ILI = 1 is the best we can hope for • If ILI = 10 then we are leaking about 10 times what we should be

  33. Operational Indicators Useful in Leak Detection • Let’s look at AWWA Audit Software….. • Southern Middle TN Community Example Water System - BEFORE LEAK DETECTION.xlsx

  34. Financial Indicators Justifying Leak Detection • Annual Cost of Real Losses • How much are my leaks costing me? • If Annual Cost of Leak Detection and Repair is less than Annual Costs of Real Losses, then is it justified?

  35. Financial Indicators Justifying Leak Detection • Let’s look at AWWA Audit Software….

  36. Water Balance Inputs • Let’s look at the AWWA Audit Software……. • Southern Middle TN Community Example Water System - BEFORE LEAK DETECTION.xlsx

  37. After the TOP DOWN Audit • If Audit Justifies Leak Detection • What’s next? • Practical Approach to Leak Detection

  38. Practical Approach to Leak Detection • Meet and Listen to Utility Staff • Investigate System • Acoustic Leak Detection

  39. Utility Staff Meeting Questions • Can a map of distribution system and sewer system be provided? • How much water are we looking for? • From Audit: CARL-UARL = ____gpm

  40. Effect of the Size of Distribution System on Water Loss • ¼” dia = 15,000 gallons/day (625 GPH, 10 GPM) • System #1: 50,000 GPD usage • Results in a 30% water loss

  41. Effect of the Size of Distribution System on Water Loss • ¼” dia = 15,000 gallons/day (625 GPH, 10 GPM) • System #2: 3 MGD usage • Results in a 0.5% water loss

  42. Leak Estimation Chart (60 PSI)

  43. Value of a Leak 50 GPM = 3,000 GPH = 72,000 GPD = 2,160,000 Gallons Per Month = $6,480 (@$3.00/thousand gallons/month)

  44. Utility Staff Meeting Questions • Has there been a gradual increase in water loss? • Has there been a large increase recently in water loss? • What failures have been found within the distribution system?

  45. Distribution System Failures • Service line failures: polyethylene, galvanized, copper;

  46. Service Line Failures

  47. 1.0 Million Gallon/Month Leak ($3000/Month) • IMG_1268.MOV

  48. Main Lines • IMG_1272.MOV

  49. Distribution System Failures • Main line failures: PVC, cast iron, galvanized.

  50. Utility Staff Meeting Questions, cont’d • What soil types are present? • Limestone; • Red clay; • Sand; • Sink holes.

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