Land Information New Zealand (LINZ) has contracted a survey of the seafloor in and around Hokianga harbour so they can update their nautical chart for the region.
LINZ’s nautical charts are essential for the safety of professional skippers, recreational boaties and others using New Zealand’s waters. It has an annual programme of updating charts, and carrying out a survey is an essential first step in this work.
The survey is being carried out on LINZ’s behalf by Discovery Marine Ltd and will gather information the seafloor, water depth, tides, currents, seabed type and hazards to navigation.
A team of 4-5 surveyors will commence the field work in September and operate two survey boats throughout the harbour for several months.
To measure the height of the tide in the Hokianga, tide poles and gauges will be temporarily installed on the wharves at Omapere, Opononi, Te Karaka, Rawene and Kohukohu.
The survey will have no impact on the environment. A number of small sea bed samples will be collected to support information for the new chart. Once the bottom samples have been identified they will be returned to the sea.