End-of-year update

Published 17/12/2021

With the weather continuously reminding us why this work is so important, we wanted to provide an end-of-year update on our work to improve the stormwater system.

Karehana design work underway 

Following Porirua City Council’s decision to invest $17.9 million in reducing the flood risk in the Karehana catchment, our consultant engineers Stantec are moving ahead with design.  

The council agreed to an integrated package of works including a pump station and ‘feeder’ channel in Karehana Park; stream upgrades above the park; a main pipe down Cluny Road; improvements to the Airlie Road culverts; and inlet improvements to reduce the risk of blockage from debris. 

Some residents may have seen indicative diagrams showing what these things might look like and where they could go. With design work now under way a much more detailed picture of what will be constructed is being developed and will be available.     

There’s been an initial discussion with representatives of the Residents Association and the Flood Action Group about how to minimise the impact of works on the park, while still removing stormwater at the volumes required and keeping within budget.  

We’ll be in touch with residents in the Karehana Park area after Christmas (likely from mid-January) to talk through the design work in more detail. We plan to hold a drop-in session for everyone interested in the first quarter of 2022. 

Our timetable is to complete design and obtain any necessary consents over the next year, with a view to starting the first phase of construction in 2023.  

Airlie Road inlet and pipe 

In November 2021, we investigated the state of the pipeline under Airlie Road, including removing built-up sediment, locating stormwater manholes and inspecting the pipelines via a camera. We removed a lot of sediment. There will be further investigations in this area, as we progress with design. 

James Street/Taupō Stream catchment 

We’re also getting under way with developing options for reducing flood risk around James Street and the State Highway, in the Taupō Stream catchment.  

Our engineer has been in touch with some residents and local businesses and a representative of St Theresa’s as part of investigations into what’s causing flooding in this area. He’s been looking at water flows from the Grays Road/Mo Street area and from the north as well as across the State Highway. Surveying is also being undertaken and will be completed over the next couple of months.   

Wellington Water aims to recommend a preferred option to the council by mid-2022.  

Keeping in touch 

If you have any questions about this project, please get in touch with Lyndie McMillan, Project Director Plimmerton Stormwater Catchment Management and improvements Project, Wellington Water Lyndie.McMIllan@wellingtonwater.co.nz or contact Janice.rodenburg@wellingtonwater.co.nz  

As always, if there is an immediate risk of flooding, or you are aware of a stormwater inlet becoming blocked, please ring the Porirua City Council Contact Centre on 04 237 5089, at any time of day or night.