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Map
<p style='background-color:rgb(255, 255, 255); border-style:solid; border-width:0px; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>This dataset presents the extent of coastal inundation under present-day conditions for Mean High Water Springs tides (MHWS6) and multiple Annual Exceedance Probability (AEP) events. The mapping identifies low-lying areas susceptible to flooding from elevated sea levels due to tides and storm surge.<br />Covers nine coastal inundation cells:</p><ul><li>Waimea Inlet</li><li>Tāhunanui</li><li>Rocks Road</li><li>Nelson CBD</li><li>Nelson Haven</li><li>Boulder Bank to Pepin Island</li><li>Delaware Bay estuary</li><li>Delaware open coast</li><li>Oananga Bay</li></ul><p style='background-color:rgb(255, 255, 255); border-style:solid; border-width:0px; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>Mapping is based on elevation only and does not reflect flow paths or wave effects.<br />Finalised April 2026, based on 2025 LiDAR and 2020-2024 modelling.<br />Developed by Tonkin & Taylor Ltd for Nelson City Council and recorded as <strong>Nelson Coastal Inundation Mapping Update, Phase B </strong>(v1), December 2024 and <strong>Addendum</strong>, April 2026.<br />Derived from 2025 LiDAR data and NIWA (2018) storm tide levels. Mapping uses a bathtub approach and does not account for overland flow paths, engineered structures, or future shoreline changes.</p>
Present Day
Coastal Flood Models
Inundation
AEP
MHWS6
The purpose of this data is to identify areas susceptible to static coastal inundation under present-day extreme sea level conditions.
The mapping supports land use planning and hazard communication by showing areas below projected water levels using a bathtub model.
Developed by Tonkin & Taylor Ltd for Nelson City Council.
<p><span style='background-color:rgb(255,255,255); color:rgb(74,74,74); font-family:inherit; font-size:11pt;'><span style='border:0px solid currentcolor; box-sizing:border-box; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:17.6px; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>This information is licensed under a </span></span><a style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(0, 97, 155); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration:none; text-indent:0px; text-transform:none; word-spacing:0px;' target='_blank' href='https://creativecommons.org/licenses/by/4.0/deed.en' rel='nofollow ugc noopener noreferrer'><span style='font-family:inherit; font-size:11pt;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:17.6px;'>Creative Commons Attribution 4.0 International License</span></span></a><span style='background-color:rgb(255,255,255); color:rgb(74,74,74); font-family:inherit; font-size:11pt;'><span style='border:0px solid currentcolor; box-sizing:border-box; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:17.6px; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>. Any use or download of this data must comply with these licence terms. For further information please contact Council </span></span><a style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(0, 97, 155); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration:none; text-indent:0px; text-transform:none; word-spacing:0px;' href='mailto:environmental.planning@ncc.govt.nz?subject=Natural%20Hazard%20Maps%20Enquiry' target='_blank' rel='nofollow ugc noopener noreferrer'><span style='font-family:inherit; font-size:11pt;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:17.6px;'>environmental.planning@ncc.govt.nz</span></span></a><span style='background-color:rgb(255,255,255); color:rgb(74,74,74); font-family:inherit; font-size:11pt;'><span style='border:0px solid currentcolor; box-sizing:border-box; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:17.6px; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>.</span></span></p>
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