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

The Standardised Precipitation Index (SPI) is a simple measure of drought (and also of very wet conditions) and is based solely on the accumulated precipitation for a given time period.

NIWA discusses, in depth, this year's most asked question—what is happening to our fresh waterways?

Raglan B Cam-era station

Submerged plants have a number of advantages that favour their use as indicators of lake ecological condition.

A regional climatology is a summary of the typical weather and climate of a region, based on historical data observations made at climate stations located within the region.

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?

Atlantis is a 3D, spatially-explicit, trophodynamic ecosystem model that integrates biology, physics, chemistry and human impacts to provide a synoptic view of marine ecosystem function.

Short-term to long-term data estimation

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

The High Performance Computing Facility (HPCF) is supercharging New Zealand science.