The floods in 2004 were some of the largest in the Manawatu-Wanganui region in recent times. Post-flood analysis identified gaps in knowledge concerning flood risk. To address this, a flood mapping project to identify and quantify the extent of flood hazard was initiated. This five year project saw significant investment in data acquisition for flood modelling to better provide information to the public and protect people and property.
A series of flood models were developed where key risks were identified, with various annual return intervals (ARI's). Those presented here have a probability of 0.5, meaning that in any given year there is a 1 in 200 chance that it may occur. These models represent a snapshot in time. Subsequent changes to land forms on the flood plains (drains, berms, etc) will affect the utility of these models.
Important: The flood information provided only shows river flooding and does not show all the areas that might get wet during an extreme rainfall or flood event. Areas of ponding from stormwater and other overland flow sources are not included in the model output, and the modelled extent may not cover the full flooded area for a given event. The intended use for this information is as a planning tool and must not be used in isolation. Consultation with Coordinator District Advice at Horizons Regional Council is required for advice at a property level for flood hazard.
The information presented here is a cartographic representation; features shown may not be in their true location. More detail than is presented here is available on request from Coordinator District Advice, Horizons Regional Council.
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