Bicycles, stormwater and bioengineering... the Alexandra Stream enhancement project

Authored by Rowan Carter and Damian Young. Prepared for 2010 NZWWA Stormwater Conference.


Integrated catchment management planning is a lot more than just stormwater pipes and receiving environments. Increasingly, it is about planning to meet less tangible social and amenity objectives, while achieving water quality, ecological and flood management outcomes.

The Alexandra Stream enhancement project is located in the Oteha Valley on Auckland's North Shore. This project involves the integration of a major public cycleway project with stream restoration, wetland enhancement and stormwater infrastructure improvements. It represents a unique opportunity to achieve community outcomes through the implementation of low impact design principles.

This paper documents the process, philosophy and technical innovations that have underpinned this project and discusses the institutional capacity requirements. In particular, it will address the following key elements:

  • How integrated catchment management planning is used to deliver quadruple bottom line outcomes.
  • Methods used in identifying issues and enhancement opportunities.
  • innovative approaches to water quality improvement; e.g., bioengineering techniques used in the restoration of wetlands and enhancement to offline treatment systems.
  • The collaborative approach to planning between transport, parks and three waters departments.

Jennifer Howe

Digital Content Manager