Precise Alum Application

HAB had another productive day and applied over 30,000 gallons of alum to 72 acres of the lake.  Although reported wind speeds at the nearby New Richmond airport reached 18 mph in the afternoon, we adjusted our application plan to work in calm waters along the sheltered west shore where winds were 3-7 mph on the lake (HAB measures wind speed throughout the day on the barge in the application zone).  HAB’s application equipment is well-suited for the precision required for the Cedar Lake restoration project.  Any gaps in coverage would allow for phosphorus from untreated lakebed sediments to leach into the overlying water column and stimulate future algal blooms.  An onboard computer system ensures that application is complete and uniform by integrating the location of the barge with GPS, the barge speed, water depth and alum flow rates.  The exact dose is programed into the software and inline flow sensors measure the flow of alum through the distribution lines in real time.  Automated values, which are controlled by the computer, open and close as needed to adjust for barge speed and location to make certain the prescribed dose is applied.  Tadd Barrow (HAB’s application specialist) follows a grid and each application path is recorded and displayed on the guidance monitor to prevent gaps in the application.  At the end of the project, HAB produces a coverage map showing every application path and confirms the complete coverage of the lake.

Cedar Lake Alum Application from HAB Aquatic Solutions on Vimeo.

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