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The flooding maps provide general details about flooding patterns and areas at risk. They have been produced using computer models using verification with actual events where possible. Flood extents shown in the maps are regional in scale and not meant to show specific flooding details on each property. In the Central Hawke’s Bay District Council area, an interim solution of flood hazard mapping has been implemented using a contour based approach which identifies rivers, streams, drains and overland flow paths as flood risk areas. |
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The flooding maps provide general details about flooding patterns and areas at risk. They have been produced using computer models using verification with actual events where possible. Flood extents shown in the maps are regional in scale and not meant to show specific flooding details on each property. In the Central Hawke’s Bay District Council area, an interim solution of flood hazard mapping has been implemented using a contour based approach which identifies rivers, streams, drains and overland flow paths as flood risk areas. |
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Hawke's Bay Regional Council |
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50000 |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Much of the settled Hawke’s Bay region is low lying and built on river flood plains. This brings the risk of flooding, which is our most common natural hazard - a severe storm or flood happens every 10 years on average. Major storms affect wide areas and can be accompanied by strong winds, heavy rain or snowfall, thunder, lightning, and rough seas. They can cause damage to property and infrastructure, affect crops and livestock, disrupt essential services and cause coastal inundation.</SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN>Rivers normally flood every winter when a storm brings more rainwater than can soak into the soil. When floods threaten communities the flood become a hazard. In Hawke's Bay stopbanks have been built alongside many of the rivers to hold in the extra flood water. However</SPAN><SPAN>,</SPAN><SPAN> in a severe storm, rivers could breach stopbanks and the flood waters may </SPAN><SPAN>inundate</SPAN><SPAN> farms, homes, shops, schools and damage roads and other infrastructure.</SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>There have been significant flood protection systems completed on the Heretaunga Plains and the Ruataniwha Plains. Flood protection works in Hawke’s Bay are generally designed to contain a 1% annual exceedance probability (AEP) flood). These works have significantly reduced the effect of small to medium sized floods, but a large flood could overwhelm the works and have a devastating effect. Such a flood, which exceeds the design capacity of the flood protection system, is called a Super Design Flood. Flooding from localised downpours in urban areas can also overwhelm drainage systems, so events below the AEP can still be costly.</SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN>With climate change, rainfall patterns in the Hawke’s Bay are expected to change over the next century; winters are predicted to become drier, but overall flood risk is expected to increase as single events may be more intense.</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The specific line drawn to delineate the flood zones should be assumed to have a buffer ranging from approximately 5 m in steep areas, up to approximately 50 m in flat areas. There may be exceptions to this estimate.</SPAN></P><P><SPAN>Not all floodable areas have been mapped. There may be water courses or overland flow paths that are not able to be delineated due to limited resolution, and there may be areas at risk of flooding that have not been examined due to lack of data.</SPAN></P><P><SPAN><SPAN>This material is licensed under a Creative Commons Attribution 3.0 New Zealand (CC BY 3.0) Licence. For more details visit </SPAN></SPAN><A href="http://creativecommons.org/licenses/by/3.0/nz"><SPAN><SPAN>http://creativecommons.org/licenses/by/3.0/nz</SPAN></SPAN></A><SPAN>. Where the data are used in a figure</SPAN><SPAN>Hawke's Bay Regional Council</SPAN><SPAN>requests attribution in the following manner: (C) </SPAN><SPAN>Hawke's Bay Regional Council </SPAN><SPAN>201</SPAN><SPAN>5</SPAN><SPAN>. Where reference to the data is to be included in a Reference List the following citation is suggested: </SPAN><SPAN>Flooding digital data </SPAN><SPAN>2006 -</SPAN><SPAN>2013. </SPAN><SPAN>Hawke's Bay Regional Council</SPAN><SPAN>.</SPAN></P></DIV></DIV></DIV> |
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Napier_100Year_Flood_Hazard_HBRC_tin |
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["flooding","river","flood plains","flood protection","storm"] |
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en-NZ |
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500000 |
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