Serious flooding has occurred in most parts of New Zealand at some time or another, including in Whanganui.

Whanganui has a history of repeated flooding in low lying areas, particularly adjacent to the Whanganui, Whangaehu and Mangawhero Rivers and neighbouring streams.

Climate change modelling tells us that heavier and more frequent downpours will cause localised or large-scale flooding in this area of the country.

Whanganui residents living or working near streams or rivers, on river banks or surrounding flats and floodplains should keep up-to-date about the weather and its effects on river levels.


The most significant flood event on record for Whanganui was in June 2015, when a combination of heavy rain caused simultaneous surface flooding as well as landslides around the city and in the lower, middle and upper catchments. This caused the Whanganui and our other rivers to flood.

This event was considered a 1-in-100-year flood.   

How to stay informed about rainfall and river levels

Call Waterline Whanganui Catchment - 0508 4 FLOOD (0508 435 663) for 24-hour river height and rainfall information.

Be prepared

People in at-risk areas should have a plan prepared for evacuating themselves, pets, livestock and important items or goods to a safe location.

Flooding may also impact our roads, so make sure you have supplies ready in your car in case you are stranded for some time

You may also be stuck at work, so prepare your workplace emergency plan

How to prepare for an emergency - Get Thru website 

Page reviewed: 18 Jan 2018 11:47am