Category Archives: Services

Kaituna River Mixing Study

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.

Rhodamine WT dye entering the Kaituna River from the Diagonal Drain pump station, 2.3 km upstream from the river mouth (9 Nov 2017). Photo by Andy Belcher.
Lower Kaituna River facing towards Maketū Estuary. The borrow pits are visible on the true right of the river. At this location discharges from Diagonal Drain had mixed across 50% to 70% of the river, depending on the tide (9 November 2017). Photo by Andy Belcher.

Water Quality Bottom Lines for Brackish Lakes and Coastal Lagoons

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.

Ecosystem Health Attributes for Brackish Lakes 2014.