Wastewater Collection System Rehabilitation and Replacement (R&R) Program Prioritization

A large Florida Utility identified the need to develop and implement a wastewater collection system rehabilitation program. CDM provided services to provide technical and program management assistance to staff in developing and implementing a countywide Wastewater Collection System Rehabilitation and Replacement (R&R) Program. This project developed a systematic methodology to identify, rank and prioritize sewer system repairs and/or replacement projects. The process developed an initial project list and the development of a wastewater collection system rehabilitation program implementation strategies and tools. The program provided an evaluation of the gravity system, pump stations, and forcemains in order to prioritize R&R needs. In order to identify the immediate rehabilitation needs in the system and to provide a framework for a continuing future rehabilitation strategy, collection system components (gravity systems, pump stations, and forcemains) were evaluated based on both criticality (consequence of failure) and condition (probability of failure). Prioritizing pipes and pump stations in terms of their criticality and condition identified components that needed immediate inspection, rehabilitation, and continued monitoring.