This class of methods is focused on the rehabilitation of existing utility pipes to restore performance and/or avoid failure of those pipes. This class of rehabilitation methods is subdivided into “Renovation” (which upgrades the structure and/or improves protection or performance of sections of the existing pipe), “Replacement” (which provides a new pipe or the functional equivalent of a new pipe) along the same alignment as the existing pipe), and “Repair” (which is focused on addressing localized defects in the existing pipe which may be structural or points of leakage). The reader should note that the terms rehabilitation, renovation, renewal, etc. are used in slightly different ways by different organizations and agencies. Here rehabilitation is used as a broad term to describe the improvement of an existing pipe.

The choice of whether to develop a replacement, renovation or repair solution for a deteriorated pipe system depends on many factors - including the system needs, budget constraints, site constraints, condition assessment, etc. The potential options for a particular project will be derived from an engineering analysis which may lead to a preferred approach or a mix of approaches.

In this chart, as an aid to understanding the methods and their applications, the methods have been sorted into techniques that have a similar function or that can be considered related techniques.