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Lake Pegasus trial begins

Thursday, June 16, 2022   Posted in: Signatory Notice Board By: Administrator With tags: water, environmental health, safety

The Waimakariri District Council have been working closely with the developers of Pegasus to explore options to help manage seasonal algal bloom in the lake. Work will begin this week (13th June 2022) trialling an approach to increase aeration in the lake which may help to mitigate this.

While monitoring buoys are already in place, Pegasus residents will see some activity around the lake as the equipment is being installed this week.

The trial will focus on a specific section of the lake that will be separated from the rest of the lake. There will be an air compressor installed under the small footbridge and curtains underwater to form the trial area. The airline and aeration equipment will be put into the trial area near to the yellow buoy in the southern part of the lake. They will be on the bottom of the lake so not visible from the surface.

There will be some testing of the equipment over the next week to makes sure it’s running properly before it’s turned on continuously within the next month or so.

The monitoring buoys in the lake support the aeration trial. They will regularly measure oxygen and temperature in the water and this data will be used to determine the effectiveness of the aeration trial.

Increasing oxygen levels in deeper parts of the lake should help with water quality. In addition the aeration in the water will help develop currents, disrupt the algae, create more movement and make the lake less stagnant. While this mitigation option shows promise, it’s not guaranteed to prevent of algal blooms in the lake.