On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

Inter-agency collaboration on the Ruamahanga River at Waihenga, 21 October 2015

Shyam Morar, GWRC

Photos 1-3: inter-agency collaboration on the Ruamahanga River at Waihenga, 21 October 2015. Side-by-side comparison of visual clarity measurements (photo 2) and water sampling (photo 3), to intercept the same water mass.