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This landslide susceptibility assessment is intended to be a high-level tool for identifying areas that are susceptible to landsliding across the District, based on mapped landslide and instability features and the relationship between geology and slope angles. The updated mapped susceptibility zones can be considered analogous with the Low, Moderate and High “land stability hazard zones” as outlined in the EES (Whangarei District Council, 2010, “Environmental Engineering Standards”), and the information, assessment and reporting requirements stated in the EES will continue to be suitable for the updated mapped land in the District.
This susceptibility assessment does not remove the requirement for site specific assessment at the time of subdivision, change in land use, or building works that would require consent in a site suitability report. Updates to the District Plan may also require site specific assessments for other activities. Site specific assessments are required to be undertaken by a geotechnical professional to confirm the susceptibility class and the suitability of each site for development. The map should be read in conjunction with the T+T report dated October 2020, reference 1012149.3000. |
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This landslide susceptibility assessment is intended to be a high-level tool for identifying areas that are susceptible to landsliding across the District, based on mapped landslide and instability features and the relationship between geology and slope angles. The updated mapped susceptibility zones can be considered analogous with the Low, Moderate and High “land stability hazard zones” as outlined in the EES (Whangarei District Council, 2010, “Environmental Engineering Standards”), and the information, assessment and reporting requirements stated in the EES will continue to be suitable for the updated mapped land in the District.
This susceptibility assessment does not remove the requirement for site specific assessment at the time of subdivision, change in land use, or building works that would require consent in a site suitability report. Updates to the District Plan may also require site specific assessments for other activities. Site specific assessments are required to be undertaken by a geotechnical professional to confirm the susceptibility class and the suitability of each site for development. The map should be read in conjunction with the T+T report dated October 2020, reference 1012149.3000. |
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Tonkin & Taylor Ltd. PO Box 5271, Wellesley St, Auckland 1141. www.tonkintaylor.co.nz |
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5000 |
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[] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This landslide susceptibility assessment is intended to be a high-level tool for identifying areas that are susceptible to landsliding across the District, based on mapped landslide and instability features and the relationship between geology and slope angles. The updated mapped susceptibility zones can be considered analogous with the Low, Moderate and High “land stability hazard zones” as outlined in the EES (Whangarei District Council, 2010, “Environmental Engineering Standards”), and the information, assessment and reporting requirements stated in the EES will continue to be suitable for the updated mapped land in the District.</SPAN></P><P><SPAN>This susceptibility assessment does not remove the requirement for site specific assessment at the time of subdivision, change in land use, or building works that would require consent in a site suitability report. Updates to the District Plan may also require site specific assessments for other activities. Site specific assessments are required to be undertaken by a geotechnical professional to confirm the susceptibility class and the suitability of each site for development. </SPAN></P><P><SPAN>The map should be read in conjunction with the T+T report dated October 2020, reference 1012149.3000.</SPAN></P><P><SPAN>Additional Notes: </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>Due to the size of the study area, field validation has not been undertaken for the entire District. Areas visited in the field were chosen to target areas of uncertainty in the mapping, areas of complex geological boundaries, and in areas to confirm susceptibilities observed through aerial mapping.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>Where a site to be developed has multiple susceptibility zones shown it is considered prudent to assume the highest level of susceptibility and undertake the corresponding level of assessment recommended in the EES (e.g. a site with areas of low, moderate and high susceptibility would require an assessment meeting criteria of a high level investigation).</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">Data updated by Tonkin + Taylor, March 2022</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>T+T guidelines for limitations of use/applicability.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The T+T report states:</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The analysis has been undertaken using the same base information which introduces the same uncertainties related to the scale and resolution of the information. The area affected by landslides is based on mapping undertaken at </SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>1:10,000</SPAN></SPAN><SPAN><SPAN>scale. Smaller scale landslide features are likely to be present; however, for the purposes of a district wide susceptibility assessment, the scale is considered appropriate. Site specific assessments will be required in any case to understand the susceptibility and risk at a particular site where development is proposed.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN>The appropriate </SPAN><SPAN>scale </SPAN><SPAN>range is between 1:550,000 and 1:5,000.</SPAN></P></DIV></DIV></DIV> |
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| title:
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Proposed Land Instability |
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["WDC","Landslide","Instability","Natural Hazards","Plan Change","PC1-2023"] |
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en-US |
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625000 |
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