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Description: Whangarei District Council Operative District Plan layer.

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Layer: Mining Subsidence Hazard Area (0)

Name: Mining Subsidence Hazard Area

Display Field: DATE_

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Description: Mining Subsidence Hazard includes operative mining hazard for Te Kamo and proposed mining subsidence hazard for Hikurangi.

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Layer: Coastal Hazards (12)

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Layer: Coastal Erosion Hazard Area (7)

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Description: Coastal erosion hazard zones were developed by external experts in 2020, and are derived by empirical calculations including coastal geomorphology, geology, wave action, and historic shoreline movement. The report titled “Coastal Erosion Hazards for Selected Sites 2019-2020” (Tonkin + Taylor, 2020) can be accessed from the NRC website.

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Layer: Coastal Flood Hazard Area (14)

Parent Layer: Coastal Hazards

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Description: Coastal flood hazard zones were developed by 3 different external expert consultants in 2020. The layers are derived by advanced models using empirical calculations including tide gauge and extreme water level analysis, wind records and wave models, and used the 2019 LiDAR DEM. Three different models were used to construct the coastal flood layers: a full-coastline ‘bathtub model’ (Tonkin and Taylor, 2020), and two hydrodynamic models for Rangaunu (eCoast, 2020) and Kaipara (DHI, 2019) harbor. The reports detailing the methodologies can be accessed from the NRC website.

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Copyright Text: NRC Natural Hazards; Tonkin + Taylor; DHI; eCoast

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Layer: CFHA 1 - 50years (2)

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Description: Coastal flood hazard zones were developed by 3 different external expert consultants in 2020. The layers are derived by advanced models using empirical calculations including tide gauge and extreme water level analysis, wind records and wave models, and used the 2019 LiDAR DEM. Three different models were used to construct the coastal flood layers: a full-coastline ‘bathtub model’ (Tonkin and Taylor, 2020), and two hydrodynamic models for Rangaunu (eCoast, 2020) and Kaipara (DHI, 2019) harbor. The reports detailing the methodologies can be accessed from the NRC website.

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Layer: CFHA 2 - 100years (3)

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Description: Coastal flood hazard zones were developed by 3 different external expert consultants in 2020. The layers are derived by advanced models using empirical calculations including tide gauge and extreme water level analysis, wind records and wave models, and used the 2019 LiDAR DEM.Three different models were used to construct the coastal flood layers: a full-coastline ‘bathtub model’ (Tonkin and Taylor, 2020), and two hydrodynamic models for Rangaunu (eCoast, 2020) and Kaipara (DHI, 2019) harbor. The reports detailing the methodologies can be accessed from the NRC website.

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Layer: CFHA 3 - 100years Rapid SLR (4)

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Description: Coastal flood hazard zones were developed by 3 different external expert consultants in 2020. The layers are derived by advanced models using empirical calculations including tide gauge and extreme water level analysis, wind records and wave models, and used the 2019 LiDAR DEM. Three different models were used to construct the coastal flood layers: a full-coastline ‘bathtub model’ (Tonkin and Taylor, 2020), and two hydrodynamic models for Rangaunu (eCoast, 2020) and Kaipara (DHI, 2019) harbor. The reports detailing the methodologies can be accessed from the NRC website.

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Layer: Flood Hazard Area (15)

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Layer: 10 year Flood Hazard (17)

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Layer: Land Instability (18)

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Description: 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.Additional Notes: 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.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).Data updated by Tonkin + Taylor, March 2022

Service Item Id: 353db20833e349eeaaffb4c468e65d89

Copyright Text: Tonkin & Taylor Ltd. PO Box 5271, Wellesley St, Auckland 1141. www.tonkintaylor.co.nz

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