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

Sediment yeilds

Sediment yields (t ha-1 y-1) for the catchments draining to the southern Tauranga Harbour for the current land use, mapped for every 30m x 30m model cell. The yields do not take sediment routing into account, which would reduce the load entering the harbour.