We’re working to develop a shared pathway between Wi Neera Drive and Onepoto and provide coastal resilience along the harbourside edge of Titahi Bay Road and Wi Neera Drive. We've come a long way, but there’s still a lot of work to do – find out more below. You can contact the project team at WiNeera2Onepoto@poriruacity.govt.nz
We are really pleased to announce that on Wednesday 2 November, Council lodged its resource consent application for the coastal resilience part (Stage A) of this project.
The consent application and supporting information is now available at the link above. The consent application itself has 31 documents attached ranging from the actual application forms to detailed assessment of effects documents such as wave height modelling, a cultural impact assessment, stormwater assessments and community engagement!
The project, which will be a fantastic asset for our community and of enormous benefit to harbour health; has been a large undertaking. Getting this far has taken a huge amount of effort and support. We are looking forward to receiving a successful outcome and will keep you updated.
To make it easier to open all the documents linked within the report above, right-click on your mouse and select 'open link in new tab'.
Council has agreed to progress with a preferred option for the Wi Neera to Onepoto Shared Pathway and Coastal Resilience Project.
Delivery of the project is subject to resource consents and to securing external funding, so there is still a lot of work to do.
The preliminary concept design for the preferred option includes:
We believe this is the best solution to deliver on the project objectives; to improve cycling and pedestrian connection and address harbour edge erosion and coastal resilience. This preliminary concept design has been shaped by feedback from community and stakeholder engagement in recent years.
The preferred option we are progressing with has an estimated construction cost of $10.7m; $4m for the pathway, $6.1m for coastal resilience alongside Titahi Bay Road, and $0.6m for Wi Neera Beach improvements. (30% contingency is built in.)
The final cost won’t be known until we have obtained resource consent, completed detailed design and expert costing reviews, and we have a preferred tenderer.
Based on the current estimate, Council would need to contribute $3.6m to the project, which is being sought through the Long-Term Plan. Further funding is being sought from Waka Kotahi NZ Transport Agency and external funding sources.
If Waka Kotahi and external funding can’t be secured, the project will be closed, and the capital funding returned to the Transport renewal programme, and to City Partnerships to complete Wi Neera Beach (subject to resource consent).
Coastal erosion issues along Titahi Bay Road would be managed through the business as usual transport maintenance programme.
We look forward to your feedback and to seeing you at a drop-in information session.
Our initial work included investigations into coastal processes, rates of erosion and sedimentation, tidal and sub-tidal ecology, and stormwater management.
On the foreshore, leading experts in coastal soft engineering and managing the effects of sea level changes investigated how coastal resilience designs could work to protect the harbour edge using bathymetry (seafloor) data, wave modelling and ecological analysis just offshore.
Onshore, engineering specialists investigated possible options for the pathway and developed two preliminary concept design options, taking local constraints such as the pohutakawa trees and seagrass into account and drawing from the results of geotechnical investigations.
The main parts of the preliminary concept design include:
The diagram below shows a typical cross section of the soft coastal resilience work which includes extensive areas of saltmarsh.
This project has a long history and affordability has been a key deciding factor along the way
The project began back in 2002 with a harbour-side boardwalk proposal jointly started by Porirua City Council and Ngāti Toa.
In 2007 the Takapuwahia Village Concept Plan included, among other things, a harbour-side timber boardwalk along Titahi Bay Road linking Onepoto to Wi Neera Drive.
There have also been a few feasibility studies exploring options to provide a path/cycleway and harbour edge erosion control works.
This is a complicated project. We need to look at erosion control, harbour ecology, climate change, road construction and maintenance and building a shared pathway. All of these matters need to be addressed through a resource consent process.
Taking community advice on board
During Council consultation on the project for the Long-Term Plan 2018-38, 73% of respondents who gave feedback on various pathway and coastal protection options supported a harbour-side path and erosion repairs to the harbour edge. The majority of feedback urged Council to complete the project sooner than proposed (at the time).
Key support decisions for the project
In 2019, Waka Kotahi NZ Transport Agency (NZTA) endorsed a 4-Stage Business Case for a shared pathway between the Porirua CBD and Titahi Bay. This project is stage two of that pathway.
In 2019 a coastal expert was engaged to develop a concept for the shared pathway, which saw the introduction of ‘soft’ coastal resilience/restoration works which people requested. Soft engineering is a significant departure from previous ‘hard’ (concrete & rock) engineering solutions.
This work, plus the earlier feasibility studies and option assessments and feedback from the community and stakeholders has informed how we have developed the current project and our assessment of the options.
There are three approaches we could take to protecting the harbour edge and addressing the erosion issues: