skip to main content

Taking the Ngaruroro's Temperature

Ngaruroro temp Testing

Thursday February 18, 2016

Fibre-optic cable was used in the Ngaruroro River last week to find out more about the connections between groundwater and surface water.

Scientists from GNS Science ( were working with Hawke’s Bay Regional Council on a project in the lower Ngaruroro to investigate these connections, using water temperature and river flow measurements.

GNS scientists placed 5 kilometres of fibre-optic cable along the bed of the Ngaruroro River to measure water temperature between Hill Road (about 1km downstream of Fernhill) and Carrick Road.

At the same time, Hawke’s Bay Regional Council hydrology staff gauged flows at Fernhill and at Hill, Twyford and Carrick Roads. Preliminary flow measurements from the survey suggest that approximately 300 litres/second is progressively lost to groundwater between the upper and lower gauging sites.

For GNS the river work is providing information for both GNS Science’s ‘SMART Aquifer Characterisation Programme’ (which aims to develop a suite of innovative methods for characterisation of New Zealand’s groundwater systems), and the NIWA-led Waterscape Programme.

HBRC will use the data to assist with management of water resources.

“GNS Science hope to determine if there are gaining or losing reaches between the gauging sites that haven’t been identified before. The data collected will add to our knowledge and understanding of groundwater and surface water interaction between the Ngaruroro River and the Heretaunga aquifer,” said HBRC Scientist - Hydrology Rob Waldron.

The work was completed last week and the data will be processed and analysed over the next few months.

6 April 2016

Back to News Archive

Disclaimers and Copyright
While every endeavour has been taken by the Hawke's Bay Regional Council to ensure that the information on this website is accurate and up to date, Hawke's Bay Regional Council shall not be liable for any loss suffered through the use, directly or indirectly, of information on this website. Information contained has been assembled in good faith. Some of the information available in this site is from the New Zealand Public domain and supplied by relevant government agencies. Hawke's Bay Regional Council cannot accept any liability for its accuracy or content. Portions of the information and material on this site, including data, pages, documents, online graphics and images are protected by copyright, unless specifically notified to the contrary. Externally sourced information or material is copyright to the respective provider.

© Hawke's Bay Regional Council - / +64 6 835 9200 /