HAB had another productive day and applied 26,000 gallons of alum to 61 acre section of Cedar Lake. 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. In fact, speeds have been as much as 17 mph higher at the airport and on average the speeds are 7 mph higher across all of our measurements from the barge.
The wind speeds in the application zone on the lake have been 10 mph or lower. At these 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 throughout the project to ensure placement of the floc is optimal.

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