River Lake analysed water quality from 12 Rotorua Te Arawa lakes to better understand potential causes of interannual variability of the Trophic Level Index (TLI); and explored ways to account for natural variability when expressing TLI targets.

Long-term water quality trends were statistically analysed. The report documents adjustments required for phosphorus data in order to account for laboratory analytical changes over the period 2010-2019.

The report can be found here: