The replacement value of New Zealand’s wastewater networks is significant, being estimated to be NZ$15.8 billion (LGNZ, 2014). Making good investment decisions is therefore very important. This document is intended to be a resource to assist public sector organisations make evidence‐based decisions on the renewal of gravity wastewater pipelines.

The document provides guidance for asset managers on the renewals process and discusses how to communicate issues related renewals planning to decision makers such as senior management or councilors, finance staff and auditors. The questions that decision makers should expect asset manager to address when proposing renewal plans are summarized.

While this document is focused on the renewal of gravity wastewater pipelines, the concepts and recommendations provided in this document are generally applicable to potable water and storm water networks.