How much nitrogen is too much nitrogen to avoid prolific periphyton growth in the Manawatu River?
We ran an experiment in 2019 to help answer this question for Palmerston North City Council. Here is our 2019 experimental setup.
A newly made stream diversion on the Huntly Bypass Project, in November 2016, and two years later in 2019 after plants have grown.
What is the phosphorus load to Lake Rotorua and how much comes from human activity?
River Lake revised estimates of P loads to Lake Rotorua to account for groundwater catchment areas, geothermal inputs and long-term average loads.
This work contributed to the Science Review required by Plan Change 10 of the Bay of Plenty Regional Water and Land Plan (RWLP).
Read the report here:
River Lake studied the mixing of diagonal drain pump station with the lower Kaituna River. We used Rhotomine dye WT to understand how well the pump station discharge mixed across the Kaituna River before the intake for the new diversion to Maketū Estuary.
The work was done for Bay of Plenty Regional Council rivers and drainage team.
Pristine kahikatea swamp forest on the Mimi River in Taranaki. Home to giant kōkopu, banded kōkopu, redfin bully and longfin eel.
Setting nutrient limits for complex ecosystems is challenging. We used multiple lines of evidence to set robust nutrient limits to safeguard the macrophyte community in Waituna Lagoon.
Read more in our paper on setting nutrient limits for lakes (click the link below).
Large longfin eel caught when sampling in Donald Creek near Featherston Wastewater Treatment Plant.
One of the giant kōkopu recovered and safely relocated as part of the SH1 Huntly Bypass Project.
Keith at River Lake coordinated an expert panel to develop possible attributes and thresholds relevant to the ecosystem health of Intermittently Closed and Open Lakes and Lagoons (ICOLLs) and brackish lakes.
The work was undertaken for Ministry for the Environment to support the National Objectives Framework (NOF) in the National Policy Statement for Freshwater Management (NPS-FM).
Read the report here.
