![](http://resources.quakecentre.co.nz/wp-content/uploads/2019/03/WastewaterRenewal_PortalPicture-450x300.jpg)
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.