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

These datasets are available in a range of formats.

NIWA's goal is to provide the science to help New Zealanders transition to a sustainable future.

Find out more about our water quality tools.

Follow NIWA's scientists as they explore the natural world, make new discoveries and share how people use their science.

Waikato exhibits a range of climates due to the variety of landscapes in the region.

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.

Waterways can easily become contaminated by pathogens when effluent is discharged nearby.

The Statement of Core Purpose spells out why the Government owns Crown Research Institutes and what it expects from them.