A Large Integrated Stormwater Solution for Oakley Flooding - Auckland

Oakley is a fully urbanised catchment in Auckland which has suffered from wide-spread flooding for several decades. After extensive modelling and investigation a large scale flood mitigation project has been proposed to tackle this difficult problem. Proposed works include five new bridges, 3km of stream widening and naturalisation half of which is currently under way as part of a new $1.4 billion SH20 motorway.

This project integrates many needs including a large motorway project, parks, local community, Iwi, transport and greenways linkage and ecological function. It is one component of a catchment–wide flood mitigation strategy which has been through a BPO approach arriving at a construction project which will make a real difference on the ground. This paper presents Oakley stream widening as an example of the new Auckland Council‟s ability to tackle difficult and complex problems at a large scale.