Alert Level 3

This project is critical and essential and will start up under Alert Level 3. All of the necessary safety precautions will be followed, including the use of PPE.

Update 19 July 2021

Below is the latest update on the project. Find out more about this exciting project here

We have successfully completed most of the construction phase of the project including the most visible aspects with installation of the bypass pipe across Titahi Bay.  The bypass pipe diverting water around Porirua School was also successfully completed during the April school holidays.

The onset of rainy weather in June this year has created challenges with completing flood protection for Porirua School with earth bunding now on hold until drier weather. Likewise with earth bunding for Ngati Toa St where a sheet pile flood defence wall has been installed to protect residents. In this case, earth bunding will be done to help blend the sheet piles into the landscape rather than provide additional protection. This work will be finalised when work on the wetland starts.

Meanwhile the sheet pile flood bunding has proven effective during heavy rain on Saturday 17 July, working as expected to prevent downstream flooding in the Ngati Toa Street area.

Alongside the universal challenges of weather, the project team has had to overcome several other challenges. This includes the diversion of crews to emergency work on Jervois Quay and difficulties taking the bypass pipe across Titahi Bay Road due to complex services and associated increase in groundwater.

Crews are expected to start work again in September

Update 28 January

We have completed laying the pipes across the southbound lane of Titahi Bay Road and are now reinstating the road-pavement for this lane. 

On Friday 29 January, we will swap the northbound traffic across the reinstated section of the trench and commence trenching across the northbound lane. As there are no utility services like gas or electricity we will be able to do this work more quickly and aim to complete the trench across to the west-side footpath and open the road open to 2-way traffic by Wednesday afternoon 3 February.

Traffic management will continue to be in place.

 Porirua central stormwater2

Update 20 January 2021

Titahi Bay Road detour to be removed for long weekend

We will be removing the one-way diversion of traffic along Titahi Bay Road over Wellington Anniversary weekend so traffic can flow freely both ways.

The detour will be removed by 3pm Friday 21 January and then reinstated at 9am Tuesday 24 January, allowing us to carry on with the northbound trenching as soon as the southbound lane trench is resurfaced.

Thankyou for your understanding as we work to improve Porirua's stormwater infrastructure, have a great long weekend - and drive safely!



Update 11 January 2021

We are about to begin work on the next stage of the project, which involves constructing the pipe across Titahi Bay Road. To allow this to happen southbound traffic on Titahi Bay Road will be diverted along Wi Neera Drive and Semple Street. This work is anticipated to happen between 18-29 January.  While the work has been planned at a time when traffic volumes are normally lower, delays are still expected. We appreciate everyone's cooperation as we work to improve out city's stormwater network

Update 25 November

Our teams are making good progress working on the stormwater pipe upgrades.

Currently we are preparing for the pipe upgrade work across Titahi Bay Road, which will start early January 2021. Traffic management will be in place during this stage of the work.

Once that has been completed we will move on to upgrading the stormwater pipes around Porirua School.


What's happening?

We are upgrading the stormwater network in Porirua City in a project that will alleviate flooding and improve the health of Te Awarua-o-Porirua Harbour.

The project involves improving drainage in low-lying flood prone areas of the CBD through large scale upgrades of stormwater infrastructure carrying flows into the harbour, and flood protection measures for Porirua School and residential properties on Ngāti Toa St in Takapūwāhia.

A central and exciting feature of the project is the creation of new wetland adjacent to the hockey turf on Elsdon Park. This will capture excess water and naturally filter stormwater before it runs into the harbour.

It will also provide a wonderful new native habitat within the city. Work will commence on the wetland development from Summer 2021.

This project is part of Porirua City Council's long-term strategy to improve Porirua’s stormwater, wastewater and drinking water pipe networks.


2018 087 Elsdon Wetland Illustrations for Communications team B3

2018 087 Elsdon Wetland Illustrations for Communications team B5

How long will it take?

The project started in May 2020 and will be completed mid 2022. The first stage has involved upgrading the stormwater infrastructure - see the map below, which details the work programme. As of June 2021, the project is 60% complete and on track for full delivery by July 2022. 

Our work will generate some construction noise at times, but we will do our best to keep this to a minimum. You can contact our project team anytime if you have any concerns about that.

There will be traffic management in place at some stages where we are working on the road. On-street car parking in the area alongside the worksites will also be restricted and we ask you to please not park your vehicle within the coned areas. This will help us to get the work done as quickly as possible.

If you have any questions about this project, please contact:

  • Peter Mumm, E Carson & Sons, 027 289 2400

After hours, please call the Porirua City Council Call Centre at 04 237 5089

Updated map