This guideline provides water utilities with a framework to develop a WWO strategy to manage their systems in relation to WWO.

Wastewater system complexity varies considerably across ANZ, from small systems with minimal wet weather flows, to large complex systems, and systems with substantial wet weather flows. This guideline enables water utilities to develop a WWO strategy that will be specific to their unique needs and local context through a flexible approach.

Development of a WWO strategy requires two key considerations: the impact to the receiving environment and the management of this impact. This guideline provides a range of potential considerations for both.

This report is the culmination of six years of work, several iterations, and many hours of water industry members, WSAA staff, and consultant input – a true collaborative effort. WSAA would like to acknowledge previous WSAA staff and consultants that contributed to the concepts in this work, as well as case studies.

These guidelines were delivered by Aurecon, with assistance from the following people:

  • Anin Nama – Watercare, New Zealand
  • Cameron Jackson – Urban Utilities
  • Elliot Stuart – WSAA
  • Jeremy Silk – Hunter Water
  • Lynne Powell – Cairns Regional Council
  • Michele Cassidy – Sydney Water
  • Rebecca Goulding – South East Water
  • Reza Vosough – Yarra Valley Water
  • Stephen Shinners – Central Coast Council

WSAA would also like to gratefully acknowledge the input and peer review from Kate Harriden (Monash Sustainable Development Institute, Monash University) of the content in the Cultural receiving environment principle, which will push the water sector forward in this important area.

DOWNLOAD the full report below and individual case studies HERE.


AuthorWater Services Association of Australia
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Managing Wet Weather Overflows PDF