For all details on this decision see pages 55–57 of the consultation document, Securing our future[PDF 8.41 MB].
Key decision 2: Should we renew the Paekākāriki seawall a different way?
We have to repair the wall, but the costs for the current plan have increased significantly and we need to review our approach.
What are the options?
Timber (like-for-like replacement) with a 25-year life
We recommend: Renew with a like-for-like replacement with a 25-year life
In a five-year programme starting in 2021/22. This is the more affordable option, and the most realistic given the already significantly increased cost of the existing planned option. The wall would be rebuilt as is, with a 25-year life, and beach access would be improved. We have a number of local contractors that have the capability to deliver this project.
Climate change is also an important part of our considerations, and a shorter design life gives some flexibility in the future to reconsider the nature and extent of further coastal hazard management options for The Parade.
Rebuild with a concrete and rock wall with a 50-year life
This is the existing planned option, which would be a full replacement of the seawall built with concrete and rear
raised rock revetment, and designed to have a 50-year life. Interlinking concrete and rock is complex construction and costs are now projected to be $27 million.
Since consultation was undertaken with the community for the 2018–38 Long-term Plan about the Paekākāriki seawall, and a plan developed for replacing the wall, costs and conditions have changed.
The estimated cost of the concrete and rock option currently planned has increased substantially and Council considers it necessary to explore how the wall can be renewed at a more reasonable cost to the district. Increased costs in other areas across Council also mean we need to look closely at the relatively high cost of this project and the impact it would have on our debt.
We know the impacts of climate change will be experienced in different ways in different parts of the district. How we deal with the Paekākāriki seawall needs to be considered more widely, to ensure equity across our communities and to provide an approach for assessing similar future needs in the district. At the same time, we need to provide improved access to Paekākāriki beach and ongoing protection for Council assets such as the water piping beneath The Parade. We also want to ensure that as far as possible we retain the core elements of the concrete design option worked on with the Paekākāriki Seawall Design Group and the community board, in consultation with the Paekākāriki community.
Why do we need this?
Council is committed to renewing the almost 1-kilometre (930-metre) seawall in some way. The seawall protects community infrastructure on the Paekākāriki foreshore, such as roads and water assets, for which the Council is responsible.
The existing wall is in extremely poor condition and requires significant ongoing maintenance. The seawall failed badly in the July 2016 storm surge and again during Cyclone Gita in early 2018. The wall was originally built in the 1970s with a 25-year design life, though some sections have lasted longer.
Council is also committed to improving access to the beach and along The Parade for all users. We also need to consider traffic calming for The Parade. This is funded separately, but can be done alongside work on the wall. The beach at Paekākāriki is a feature of the village both for locals and visitors. When Transmission Gully opens, the village will be bypassed, so an improved beach frontage will be a drawcard and help the economic stability of businesses in the village centre.
Options for renewing the Paekākāriki seawall:
Timber (like-for-like replacement)
- 25-year life
- $17 million (funded from borrowings)
- five-year programme starting in 2021/22
- opportunity to use local contractor
- access to the beach improved
- improvements for walking and biking
- further involvement of design group to see how we could include art and cultural elements.
Cost – $17 million funded from borrowings.
Rates impact – year one, 0.04 percent; year two, 0.17 percent; year three, 0.34 percent.
Timing – we would propose to deliver this as a five-year programme starting in 2021/22. To ensure completion,
a contract would be let for the entire project, to be delivered in stages. The advantages of this approach are that
work could be done at the best time of the year and potentially use a local contractor.
Concrete and rock wall
– current plan
- 50-year life
- $27 million (funded from borrowings)
- two-year programme starting in 2021/22
- finding a contractor may be a challenge
- access to the beach improved
- shared path for walking and biking
- artwork as part of the project as agreed with community working group.
Cost – $27 million funded from borrowings.
Rates impact – year one, 0.31 percent; year two, 1.11 percent; year three, 1.51 percent.
Timing – we would tender physical works and start construction in 2021/22, with work through to 2022/23.