Communicating flood hazards with the public – is it worth the effort?

Modelling flood hazards is a complex technical task, but an equally important challenge lies in communicating results, building public trust, and embedding modelling outputs into effective hazard management. Community engagement is often difficult: flooding is emotive, recent events heighten concern, and the inclusion of hazards in LIM reports can raise fears about property values. At the same time, some communities respond with apathy, creating a different barrier to progress.

In recent years, Wellington Water has undertaken a comprehensive flood hazard modelling programme covering every stormwater asset in its urban jurisdiction. The goal is to strengthen resilience by ensuring high‑quality hazard information informs civil defence planning, land‑use decisions, building levels, and infrastructure investment. From the outset, the programme has prioritised improving how modelling outputs are communicated and received, particularly by the public.

Experience has shown that effective engagement delivers significant benefits: public contribution to data collection, higher uptake and use of information, and stronger public and political acceptance. It also highlighted that a one‑size‑fits‑all approach does not work. Each community has unique social dynamics, and successful engagement requires time, trust, and support from communications specialists alongside engineers.

Public engagement also brings local knowledge into the process, improving understanding of flooding and supporting better preparation and management of impacts.

The paper available for download below, presented at the 2022 Stormwater Conference & Expo, provides detail on Wellington Water’s engagement programme. For more information, contact co-author Ben Fountain at ben.fountain@awa.kiwi.

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