Wind & Application Effectiveness (6/21/19)

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As of last night, HAB has completed 85% of the 2019 Cedar Lake Alum Project and has covered 580-acres of the lake!  As I’m sure you have noticed, wind speeds are higher today and are predicted to be strong again tomorrow.  So, today is a good day remind everyone of the effect of wind on the application and HAB’s plan to ensure an effective application.

High winds can cause the alum floc to drift out of the intended application zone and reduce the effectiveness of the project. They can also create unsafe working conditions for our application crew and barge. Therefore, HAB monitors the actual wind speed in the application zone with an anemometer and records the maximum wind speed during every application run. We compared these to the wind speeds recorded at the nearby New Richmond airport and confirmed the speeds are much lower in the application zone due to sheltered nature of the lake.

The wind speeds in the application zone on the lake have been 10 mph or lower throughout the project.  We anticipated the today’s current wind speed/direction and saved a sheltered portion of the lake for today and tomorrow.   At these 10 mph speeds, waves will only mix down to a depth of 2-3 feet. HAB’s application method results in the alum floc forming at a depth of 2-3 feet, and then rapidly sinks. Thus, the actual winds in the application zone are not causing the alum floc to drift or compromising the precise placement of the alum on the lakebed. HAB will continue to monitor the wind speeds at the application locations and we are prepared to suspend operations until conditions improve, if needed.

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