Atmospheric analysis

Management of stream riparian areas - including vegetation and stock access - influences the health of streams and downstream water bodies.

How may agricultural activities increase sediments in waterways?

There are many lines of evidence showing that NZ has warmed during the past century.

If you list all the historic rainfall totals for a particular month and for a specific location, rank these from lowest to highest, then divide the list into ten equal parts, you have identified the ten rainfall deciles for that month and for that location.

NIWA's High Intensity Rainfall Design System (HIRDS) offers planners and engineers more certainty about the frequency of high-intensity rainfall events, enabling them to better design stormwater drainage, flood defence systems and other vital structures.

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

Kaharoa is capable of working throughout New Zealand's EEZ and further afield.

NIWA operates about 30 other Maritime New Zealand-certified vessels based at Bream Bay, Auckland, Hamilton, Rotorua, Turangi, Wellington, Nelson, Greymouth, Tekapo, Christchurch, and Dunedin.

Digital copies of all our annual reports published since 2011.

Tuna or freshwater eels are a very significant, widely-valued, heavily-exploited, culturally iconic mahinga kai resource.

New Zealand rushes (Juncus): species-level factsheets.