Atmospheric analysis

Each waterway has its own particular characteristics relating to water flow, velocity, and quantity.

These datasets are available in a range of formats.

NIWA expends considerable effort on determining the age of commercial fish species. But why age a fish? And how do we do it?

Seasonal climate summaries from summer 2001 to the present.

Casal2 is an advanced software package developed by NIWA for modelling the population dynamics of marine species.

The UV Index is a measure of the intensity of UV radiation. The UV Index supersedes the idea of "Time to Burn" or "Burn Time", which has been used previously in New Zealand.

This national GIS ‘layer’ enables reconnaissance-scale estimation of suspended-sediment yields from New Zealand’s rivers and streams. It has been developed by NIWA in collaboration with Landcare Research.

Estuaries are at the bottom of the freshwater drainage network and, effectively, are a part of it.

There are two species of kōura or freshwater crayfish in Aotearoa.

NIWA develops and supplies custom software for environmental analysis and modelling.

This is a sub-tropical climate zone, with warm humid summers and mild winters.

A list all of New Zealand's freshwater fish species.