Clifton to Tangoio Coastal Hazards Strategy

The proposed strategy provides a framework for assessing coastal hazards risks and identifying options for the management risks for the next 100 years from now to 2120.
Download the proposed strategy. 

A proposed strategy has been developed collaboratively by Hastings District Council, Maungaharuru-Tangitū Trust, Hawke’s Bay Regional Council, Mana Ahuriri Trust, Napier City Council and Tamatea Pōkai Whenua.

Find out about the strategy development, what councils have been working on, and what’s next: Development of the Clifton to Tangoio Coastal Hazards Strategy 2120

Breaking it down

We split the coast up into units, so that each area could be considered for its specific needs.

Led by two community panels and with support from a range of experts, nine priority units were identified along the coast as being the most urgent areas requiring a coastal hazards response.

We worked with members of the community and experts to develop recommended response pathways for these priority units.

Each pathway was built from a combination of short term (0 – 20 years), medium term (20 – 50 years) and long term (50 – 100 years) hazard response actions. Importantly, the timing of each action and even the action itself can be changed in response to real world conditions. In this way, each pathway is designed to remain ‘adaptive’ to a highly uncertain future.

To identify the preferred pathway for each priority unit, six potential pathways were developed for each unit, representing the spectrum of possible responses from no or low intervention to soft engineering (e.g. beach renourishment), hard engineering (e.g. sea walls), and managed retreat. Part of this work looked at construction and maintenance costs for each pathway.

The community panels, supported by independent experts, went through an intensive process that carefully considered a wide range of options, carefully looking at the uniqueness of Hawke’s Bay’s coast, before confirming a recommended pathway for each unit.

Why do we need a strategy?

The New Zealand Coastal Policy Statement requires Local Authorities to consider and plan for coastal hazards risks. Under Policy 24 (1), Local Authorities are required to:
“Identify areas in the coastal environment that are potentially affected by coastal hazards (including tsunami), giving priority to the identification of areas at high risk of being affected. Hazard risks, over at least 100 years, are to be assessed…”

The latest Intergovernmental Panel on Climate Change (IPCC) report (AR6) shows average global sea level has risen by about 20cm since 1900. The IPCC projects it could rise by between 0.53m and 1.73m by the end of the century. By year 2300, sea level rise greater than 15m cannot be ruled out with high emissions. The report also indicates that coastal communities will experience more flooding due to the combination of more frequent extreme sea level events (due to sea level rise and storm surge) and extreme rainfall/ river flow.

The Strategy represents a cross-council approach to identifying and responding to these hazards. It provides a platform for making decisions about the most appropriate responses.

Strategy scope

The Strategy involves:

• assessing coastal hazards risks between Clifton and Tangoio associated with coastal erosion, storm surge inundation, and sea level rise occurring over the period up to 2120.
• providing a decision-making framework to identify, evaluate, consult on and select practicable adaptation options that respond to the identified coastal hazards risks
• implementing the selected adaptation option(s) in a coordinated and planned manner that will provide the best overall outcome for the Hawke’s Bay community.