Port Otago Limited was granted a 25 year consent for its inshore dredging disposal on 7 June 2017. This consent is the result of the studies undertaken during the 3 year inshore disposal consent, and the consent hearing process that took place in November 2016. The 25 year consent was first utilised on 21 June 2017 when disposal at the Heyward and Shelly Beach sites commenced.
The consent has monitoring conditions that include bathymetric surveys of the disposal sites, visual photographic record of surf conditions at Aramoana and Whareakeake, beach profile surveys along the north coast beaches, benthic monitoring of the Heyward Point and Aramoana disposal sites, rocky reef monitoring in vicinity of disposal sites, and wave monitoring of the Heyward and Aramoana disposal grounds. The consent also stipulates an adaptive management regime to follow if required.
Resource consent document: Resource Content RM 16.179.01
Read more about our disposal sites and volumes.
This short video shows the New Era working in the Otago Harbour and illustrates the dredging process from start to finish:
Dredging has been carried out in the Otago Harbour since the 1860s, with disposal of dredged material “out to sea” occurring since at least 1882. Prior to 1985 all dredged material was placed at the Heyward Point site. This included material derived from both development and maintenance dredging. In 1985, the Aramoana disposal site was first used. The Shelly Beach site was added as a further option in 1987. Sediment was placed here to assist in re-nourishing Shelly Beach, which was suffering from erosion at that time.
Otago Harbour is similar to other tidal ports around the world, as the channel and basin areas require ongoing dredging to maintained desired depths. Disposal at sea is the key economically viable way to dispose of dredged material.