Hawke Bay Coastal Strategy. Coastal Risk Assessment Technical Report
- Author
- Tonkin &; Taylor
- Year
- 2016
- Publisher / Organisation
- Hawke's Bay Regional Council
- Month
- May
- Keywords
- Strategy, risk
- Summary
- Hawke’s Bay Regional Council (HBRC), Hastings District Council (HDC) and Napier City Council (NCC) are working together to develop a strategy for managing, or mitigating, coastal hazard risks along the Hawke Bay shoreline from Tangoio to Clifton to make a more resilient community. This report provides the results of a regional scale coastal hazard risk assessment using the results of a coastal hazard assessment (reported separately). The hazards considered for this assessment are: Coastal inundation (overtopping and sea level rise) with 10%, 1% and 0.5% Annual Exceedance Probability (AEP) scenarios for the present day, 2065 and 2120. This corresponds to a 10 year, 100 year and 200 year return period event. Tsunami (modelled by HBRC) for 3 m, 5 m and 10 m which, based on the GNS most recent tsunami modelling represents 0.5%, 0.13% and .025% Annual Exceedence Probability (AEP) for the present day coinciding with Mean High Water Springs (MHWS). This corresponds to a 200 year, 750 year and 4000 year return period event. Coastal erosion (storm cut, trends, and effects of sea level rise) for 66%, 33%, 5% and 1% likelihoods for the present day, 2065 and 2120.