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

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

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.

Raglan B Cam-era station

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?

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.

Short-term to long-term data estimation

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.

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

These datasets are available in a range of formats.