Atmospheric analysis

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.

Technical information about our datasets and methodology along with related resources.

Wastewater treatment is the separation and extraction of solid waste from liquid waste, and the removal of nutrients and pathogens.

The need to provide upstream passage facilities for ensuring the long term sustainability of migratory freshwater fish populations is now well recognised.

What are the potential sources of chemical contamination from aquaculture activities?

Defining drought and identifying its causes and impacts on humans.

Northland, with its northern location, low elevation and close proximity to the sea is characterised by a mild, humid, and rather windy climate.

Pauanui North station

Projections of how climate change is likely to affect New Zealand.