New storage tanks installed in Cromwell will help prevent wastewater overflows into Lake Dunstan.

The purpose-built wastewater tanks increase the capacity of the Melmore Tce and Alpha St pump stations, and are part of a wider body of Central Otago District Council (CODC) projects funded from the first tranche of the Government’s water stimulus funding.

has received $9.46million from the fund, enabling $5.49million worth of projects scheduled for the later years of the 2018 long-term plan to be brought forward.

The tanks are designed to deal with wastewater overflows during heavy rain and system outages.

This allows for wastewater to be stored if emergency maintenance is required, avoiding overflows into Lake Dunstan.

Installation of the tanks was tendered at $630,000.

Other CODC water stimulus projects include Clyde and Roxburgh water main replacement, Alexandra northern reservoir construction, Wrightson’s wastewater pump station storage improvement and the Naseby water treatment plant clarifier construction.

Central Otago District Council capital projects programme manager Patrick Keenan said Covid-19 restrictions had delayed tank manufacture in Auckland and the availability of a subcontractor to complete site fabrication work.

However, the tanks were delivered to the site on Thursday.

Contractor Fulton Hogan is expected to complete the work by the end of March.

“The project improves the resilience of the Cromwell’s wastewater network and mitigates the risk of unnecessary overflows into Lake Dunstan.

“Being one of the first project in the water stimulus programme, it’s great to see it coming to fruition,” Mr Keenan said.

Central Otago District councillor and Cromwell Community Board member Nigel McKinlay said the town had grown 23% in the past five years and he was pleased to see infrastructure upgraded to support that.

“We are planning on this rate of growth to continue.”

“The new wastewater storage tanks are part of an ongoing programme to deliver high quality infrastructure to underpin Cromwell and Cromwell district’s future,” he said.

“Our council will be losing control over Three Waters in two years’ time, so it is also important to do as much as we can while we still have the ability to make decisions on what is best for our district.”

Central Otago Mayor Tim Cadogan said it was great to get a look at the tanks before they got covered.

“Infrastructure like this isn’t terribly sexy to the untrained eye but is hugely important to ensure we protect our environment in the event of power failures or other issues causing the pumping system to stall,” he said.