During summer the concentration of oxygen in the bottom waters, or 'hypolimnion' of Lake Taupo decreases. To find out what factors are responsible for the total oxygen decrease, NIWA scientists have been monitoring the inputs and outputs of oxidisable matter to the lake.
A new resource has been produced to aid regional councils, community groups, and others keen to monitor and evaluate their stream restoration work.
NIWA has invested in a new tool which continuously monitors a range of water quality parameters and delivers real-time data. Already we have some new revelations about the way diffuse pollutants move into watercourses.
Scientists have recently summarised water quality data from streams in two similar Waikato catchments where, since 2001, the land has been managed quite differently. The results have produced some surprises.
Our latest water quality data from around the country.
Our last three-monthly predictions, and what actually happened.
Latest information on nationwide river flows.