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Road conditions(2) Water shutdowns(1)

Dunedin City Council – Kaunihera-a-rohe o Otepoti

March 2019

Temporary measures are in place in case of flooding in Mosgiel, as the timeframes for planned upgrades to the Reid Avenue and Carlyle Road pump stations have been extended.

Construction of the Reid Avenue pump station is now expected to start around the end of 2019. We understand people will be concerned about the extended timeframe. This is a high priority project and we’re working through the process as quickly as we can.

This is a significantly more complicated project than initially anticipated. The ground condition is poorer than expected, making design and construction in the Silverstream more difficult. We’re working through these issues – the design is complete and is being peer reviewed. Some geotechnical work remains to be done before we can finalise the cost and how long construction will take.

Work on resource consents for the construction of the pump station has also been complicated and further modelling was needed to confirm that building and running the pump station would have little impact on the Silverstream. The modelling work is now done. Applications for the consents will be made shortly and we hope to have all the necessary consents in place in the second half of this year.

We are using portable pumps to increase the network’s capacity to deal with heavy rain in the meantime. We have plans in place for an emergency and have fine-tuned some of our systems to respond quickly.

The Carlyle Road pumps will be replaced this year to improve their reliability as we expect detailed design, consenting and construction on this site to take more than two years. Work on the detailed design for the pump station upgrades will start later this year.

To further alleviate flooding, stormwater pipes in the wider area will need to be replaced once the pump station upgrades are complete. Planning for this is underway, but the full body of work is likely to take a number of years.

April 2018

An independent assessment has confirmed we need to build new pump stations that can discharge around three times more stormwater than the current pump stations. The next stage of the project is to carry out detailed design of the pump stations, which is expected to start in the next month.

We expect construction of the pump stations to start at the end of 2018. We will begin with the Reid Avenue stormwater pump station as it will bring the most benefit in the short term by reducing the risk of water flowing from that catchment into the Carlyle Road catchment. Construction of this pump station is likely to be finished in late 2019. Construction of the Carlyle Road pump station will start early in 2019, finishing mid-2020.

We understand the timeframes are longer than expected. This is a more complex project than initially thought, partly because we need to keep the old pump stations running while we build the replacements in the same place. We want to make sure we get this right and allow enough time for the design phase.

In the meantime, we will use three mobile pumping units to support the current pump stations when we get significant rain. The mobile pump units will mean the network can handle more stormwater, reducing the risk of flooding in heavy or prolonged rain.

The size of the stormwater pipes in the wider area also needs to be increased to further alleviate flooding. We are assessing what’s needed and construction will start when the new pump stations are complete.

We would like to thank you for your patience during this project. We will post updates on this page and you can find more information on the questions and answers page. If you have any questions or comments on the project, please email us at waterservices@dcc.govt.nz.

Maps/plans

Map of the pump stations and catchment area (PDF, new window, 1.3MB)

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