Waiari Stormwater Upgrades

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About the project

The Waiari stream runs from South to North in East Waitara, with its headwaters south of SH3, in farmland.

The two main tributaries run through culverts under the highway and join downstream, forming the Waiari Stream. From there, the stream runs through urban areas, farmland and the Waitara Golf Course, until it reaches its outlet into the Waitara River.

The Waiari and Tangaroa catchments form the Waitara East catchment. Some interfaces between the two catchments make it advisable to undertake the Waiari, after the Tangaroa project.

The Waiari is an awa of great significance for tangata whenua. As per the NPDC Proposed District Plan, there are nine wāhi tapu sites within the Waiari catchment, one of them within the stream bed.

The Waiari catchment and the current stream alignment, with sections of open channel in blue and piped sections in grey.

The Waiari project aims to resolve stormwater issues in the catchment, applying the Waitara Stormwater Programme approach.

Puke Ariki Collection. This paepae was found on the edge of a farm drain in Easter 1959, at Richmond Street, Waitara. Found at a depth of nearly 2m although a certain amount of post-European infilling had taken place in the area.

Digging sticks (ko) were also found near the paepae. For a more detailed description see publication 'Records of the Canterbury Museum Vol. VII No. IV.

Courtesy of Manukorihi hapū.

Issues in the Waiari catchment

Proposed upgrades and restoration work

The Waka Kotahi project SH3 Waitara to Bell Block route improvements – Princess Street Roundabout presented an opportunity to divert flows from the upper Waiari catchment into the Waitara River, via a diversion stormwater pipeline. This would alleviate flood issues both in the upper and lower Waiari catchments.

The upper Waiari project enables NPDC and mana whenua to collaborate with Waka Kotahi for better outcomes for the community. The first stage of the project is the construction of a new stormwater pipe down SH3. This pipe will take the stormwater from the new Princess Street roundabout and flood flows from the upper Waiari catchment. NPDC will share the cost of this pipeline with Waka Kotahi and the asset will be maintained by Waka Kotahi.

In upcoming phases, NPDC will build a new pipe along Rahiri Street and upgrade other parts of the local stormwater network. These pipes will allow low flows to remain in the natural channel while diverting high flows to the new pipe down SH3. This will cultural and ecological values in the awa while reducing flood risk to properties, both upstream and downstream of SH3.

The Waiari, upstream from the SH3, runs through private property or is piped. Most of it is constrained by fences, culverts and the presence of invasive weeds, very little to nothing remains from the original stream habitat.

The project will look at mitigation of the fish barriers in this area of the catchment as well as opportunities to collaborate with landowners to improve the ecological health of the waterways.

The construction of the first phase (SH3 pipe) began in January 2022 and is expected to be finished in 2023.

The Rahiri Street pipeline and additional upgrades will be constructed between 2024 and 2027. These are currently in the engineering design and consultation stages.

This project will be funded from the Waitara Stormwater Programme budget.

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Waiari Stormwater Upgrades

About the project

Issues in the Waiari catchment

Proposed upgrades and restoration work

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Waiari Stormwater Upgrades

About the project

Issues in the Waiari catchment

Stormwater and flooding issues

Ecological and cultural issues

Proposed upgrades and restoration work

Upper Waiari Stormwater Upgrades Project

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