The Scenario 9 Transmission Main Rehabilitation project involves steel slip-line rehabilitation of 2,700 linear feet of the 48-inch diameter Pre-stressed Concrete Cylinder Pipe (PCCP) Transmission Main Scenario 9 along Roeser Road from 4 th Street to 9th Street. Of all the City’s PCCP Transmission Main Scenarios, Scenario 9 has the third highest percentage of pipes with wire breaks. Mitigation of the most severely distressed pipes was accomplished with replacement of Pipe #470 and carbon fiber reinforced polymer (CFRP) repair of sixteen other Scenario PCCP pipes during fiscal year 2017. However, as CFRP repair is considered a medium-term, temporary rehabilitation technique, rehabilitation in-place with welded steel sliplining is recommended.
