Dataset available for download

NIWA has developed a powerful software tool for the analysis of water quality data.

Glass eels (about 5.5 to 7.0 cm) arrive in fresh water during spring, especially during September and October, although they may be present from July to December.

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

NIWA develops and supplies custom software for environmental analysis and modelling.

This is a sub-tropical climate zone, with warm humid summers and mild winters.

This weekly update helps assess likelihood of extremely dry weather preceding a drought.

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

What are the sources of chemical contamination from wood processing?

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?

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