NIWA's Hydro Web Portal provides river flow and water quality monitoring data from NIWA’s Benchmark river monitoring network.

Maps of average annual rainfall, temperature and other climate variables have been produced for all of New Zealand, based on the period 1981–2010.

Understanding climate and climate change.

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

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

Raglan B Cam-era station

New Zealand’s coast is sculpted by ocean waves. Some wave conditions bring joy to surfers and beachgoers, but, at other times, waves can cause major hazards at sea or along the shore.

Monthly climate summaries from December 2001 to the present.