Coastal Flood Hazard Zone 0 (CFHZ0) – the area potentially susceptible to coastal flooding in a 1% AEP event as of 2020Coastal Flood Hazard Zone 1 (CFHZ1) – the area potentially susceptible to coastal flooding in a 2% AEP event in 50 years (including 0.6m of sea level rise)Coastal Flood Hazard Zone 2 (CFHZ2) – the area potentially susceptible to coastal flooding in a 1% AEP event in 100 years (including 1.2m of sea level rise)Coastal Flood Hazard Zone 3 (CFHZ3) – the area potentially susceptible to coastal flooding in a 1% AEP event in 100 years under a rapid sea level rise scenario (including 1.2m of sea level rise)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) harbors. The reports detailing the methodologies can be accessed from the NRC website.Note: Reason for overwrite: The CFHZ 1 values were incorrect The coastal flood hazard zone layer (feature) was overwritten on 8th September 2023
