Returning water to our waterways after we’ve used it in our homes, on farms and in industry is a complex and challenging process.

Kōaro are excellent climbers and like clear, swiftly flowing, forested streams.

We sponsor regional science and technology fairs around New Zealand and support learning programmes that bring science into the classroom.

These datasets are available in a range of formats.

The climate of this zone is largely dependent on the lie of the Southern Alps to the west, but many areas are also sheltered by high country to the south and east.

Due to its position in the 'Roaring Forties', a belt of strong winds in the Southern Hemisphere which generally occur between the latitudes of 40 and 49 degrees, as well as its small size, New Zealand is a windy country.

QGIS is a free, open source, desktop mapping tool, widely used in New Zealand in government, research, commercial and NGO arenas.

Casal2 is an advanced software package developed by NIWA for modelling the population dynamics of marine species.

NIWA operates about 30 other Maritime New Zealand-certified vessels based at Bream Bay, Auckland, Hamilton, Rotorua, Turangi, Wellington, Nelson, Greymouth, Tekapo, Christchurch, and Dunedin.

How do hydro-electricity activities potentially influence waterway temperatures?

River floods occur when water spills from a river channel onto land that is normally dry, and are one of New Zealand's costliest natural hazards.

The main characteristic of the Marlborough climate is its dryness. Summer droughts are frequent, and the region is often swept by warm, dry northwesterlies.