What this project is about
The aim of the project is to reduce flooding in flood-prone areas in Takanini to enable more homes to be built.
The project has three different components:
- Takanini stormwater conveyance channel (the Cascades)
- Grove Road box culvert
- Artillery Drive stormwater tunnel.
The Takanini stormwater conveyance channel will carry stormwater away from Takanini to the Grove Road box culvert.
From there, stormwater will flow into McLennan wetland for storage and treatment. Once treatment is complete, the stormwater is carried to Pahurehure Inlet, where it will be discharged.
The Artillery Drive tunnel will cater for the increased stormwater volume during storm events.
Takanini stormwater conveyance channel
Approximately 2.1 km long, the channel will be formed as a natural stream and wetland surrounded by public recreation areas.
These recreation areas will include boardwalks and a shared pedestrian/cycle path. The channel will be extensively planted with thousands of native plants to naturalise the stream banks and wetland areas.
Construction timeframe for the channel
Construction of the Takanini stormwater channel will start with Stage 1A between Grove Road, Walters Road, and Cosgrave Road.
Physical works will begin in January 2018 and we anticipate this stage will be complete by June 2019.
As part of Stage 1A, the Walters Road culvert will begin in January 2018 and is expected to be completed by April 2018. This work will require a partial closure of Walters Road over January and February 2018.
Enabling works such as demolition of buildings and construction of an in-ground barrier have already started and will be completed in January 2018.
The next stages of the channel, from Cosgrave Road to Old Wairoa Road, will begin in 2018 and continue to 2020,
Grove Road box culvert
Construction of the box culvert reached the halfway point in November 2017 and is currently on target to an early completion.
Construction timeframe for the culvert
We started work in January 2017 and expect construction to complete in April 2018.
Artillery Drive stormwater tunnel
Construction started in January 2016 and it was completed in December 2017.
Areas affected by the works are now being reinstated.
Work hours will be from 7am to 6pm Monday to Saturday.
Some work outside these hours may be required. We will notify affected residents in these cases.
Please note that noise levels and the number of truck movements will be kept within all acceptable limits.
Access to the construction areas
Construction of the Grove Road box culvert will mean no through-traffic in Grove Road from September to March 2018. Grove Road will be reopened in March 2018.
Walters Road will be partially closed between January and February 2018, with vehicle flow from both directions controlled by traffic management.
When works are complete, access to all areas will be reinstated.