Freshwater

The Mount Philistine site is located at 1655m elevation on the Main Divide near Arthurs Pass and Rolleston Glacier. It is a high precipitation area and snow records here start in 2010.

Mahanga electronic weather station (EWS) is on Mount Mahanga in Tasman. It is at 1940 m elevation near the Nelson Lakes. It's our most northerly South Island site and our snow records here date back to 2009.

A combination of artificial intelligence and scientific ingenuity looks set to be the next step forward in protecting Aotearoa New Zealand’s lakes and rivers from invasive aquatic weeds.

Preliminary analysis by NIWA climate scientists has shown that the recent Canterbury rainfall was so extreme in some inland places that it could be expected to happen only once every 200 years.

The prodigious rainmaker that hit Canterbury earlier this month saw NIWA field teams out in the elements collecting flood data from bridges, cableways and jetboat gaugings.

The eFlows Explorer webtool is designed to aid broad-scale river flow management planning across New Zealand

A NIWA scientist is asking for the help of skiers, mountaineers and alpine professionals to collect snow for a new research project.

Environmental monitoring technician Patrick Butler has spent hours travelling between the upper and lower reaches of Canterbury’s Waimakariri and Hurunui Rivers. His mission – river water quality sampling.

Estuaries provide a crucial link between our rivers and our seas. Sam Fraser-Baxter heads out with a NIWA research team keeping a close eye on these vulnerable transition zones.

How much is too much? Susan Pepperell looks at some of the tough decisions looming around access to freshwater and how science is helping with solutions.

Diquat is a herbicide (chemical) that has been used in New Zealand for many decades for submerged (underwater) weed control and also on agricultural crops. It is registered for freshwater use in New Zealand.