Dunedin (Wednesday , 20 April 2016) – The report on the South Dunedin infrastructure performance during the June 2015 flood
event was released today as part of the agenda for the Infrastructure and Services Committee meeting next week.
The report concludes that while a number of factors contributed, the main factor was the highest 24-hour rainfall total
in Musselburgh since 1923.
General Manager Infrastructure and Networks Ruth Stokes says the report outlines the known challenges with managing the
South Dunedin catchment and highlights concerns about the performance of mudtanks and the Portobello Road pumping
station during the event.
“Changes in the South Dunedin catchment since the stormwater network was designed, combined with operational challenges
and high ground water levels, all contributed to the effects of the extreme rainfall event that occurred in June 2015.
Mrs Stokes says the report shows that mudtanks weren’t maintained as required. As a result, a number of steps, including
a full review and retendering of road maintenance contracts have been adopted. Other measures include accurately
capturing data on the status of the mudtanks, a redesign of the Portobello Pumping station screen and the development of
a communications plan to inform the community of the local infrastructure challenges and how to best plan for future
events.
“However, given the volume of rainfall and the system at capacity during the June event, the water would have been
unable to enter the network even if all mudtanks were clear.”
She says the DCC must now look at what measures can be taken to mitigate such events in future.
The DCC will soon be engaging with the community about these issues and what the long term responses might be.
ENDS