Nelson City Council removes nearly 1100 properties from slope hazard maps due to mapping error

Nearly 1,100 properties have been removed from Nelson City Council's slope hazard maps due to an error in the mapping process. The mistake involved the "smoothing out" of slope angle data, which was based on LiDAR readings from 2008-2015. The council's recent geotechnical report suggests adopting the corrected maps, which will exclude these properties from the slope management overlay. However, 72 properties have been added to debris run-out overlays, while the area of the Tāhunanui Slump remains unchanged. The revised maps are part of a broader planning overhaul aimed at increasing housing density while managing natural hazards. The council maintains confidence in the accuracy of the updated maps, despite ongoing challenges from developers regarding their reliability.