AWWA DSS65641

This powerpoint presentation analyzes total costs of large diameter pipe failures in the U.S. Large diameter is defined as 20-inch or larger. Estimated U.S. main breaks each year are 300,000 for small diameter/year; and, 500 for large diameter/year. Pipe materials studies included steel, cast iron, PVC, and PCCP. Direct and societal costs for each break are provided, along with a breakdown of direct cost categories and societal cost categories, Total Cost vs Time to Contain Break, Total Cost vs Total Gallons Lost, and Total Cost vs Pipe Diameter. Statistics are given for large breaks and water loss. A National Water Main Break Database would help answer the question: Are main failures for particular materials and diameters occurring at an increasing rate? Recommendations include: Target Large Mains in Urban Areas and Consider Future Routing/Feed Options; Review the Valves in These Areas; Target Large Mains Which are Critical to Maintaining System Pressure; and, Target Specific Mains for Inspection, Renewal, or Replacement That Have a Documented National History of Failure. Includes figures.