Atmospheric analysis

A collection of ID guides to algae. Groups include major freshwater algal groups, diatoms and blue-green (cyanobacteria), red and green algae.

Floods are not unusual in New Zealand, but those that hit us early this winter broke records. Why did they occur? Should we expect more? Can we predict future floods?

The topography of the North Island has a profound effect on the weather of the Bay of Plenty region.

Understanding climate and climate change.

Some simple steps to minimise the effects of wastewater on water quality and mahinga kai.

Descriptions of the common terms that explain the processes that occur in hydrology.

NIWA's Hydro Web Portal provides river flow and water quality monitoring data from NIWA’s Benchmark river monitoring network.

Maps of average annual rainfall, temperature and other climate variables have been produced for all of New Zealand, based on the period 1981–2010.

Find out more about working at NIWA

Tairua station

Short-term to long-term data estimation