Aeration Bringing About Decomposition of Sediment

The main goal of the aeration project has been to reduce sediment. This reduction happens because the addition of dissolved oxygen enables the natural bacteria to go about their job of decomposing—”eating”—the sediment. To monitor the progress, vice president David Emmons has taken depth measurements to soft bottom over the time the nine diffusers have been in place in the lake, using a device designed and constructed by Fran Gilman. The following graph shows the record of how the depth has increased at each diffuser during the four measurement dates for this first season of aeration.

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Little Lake Northwest Test Site Survey

On June 11 and 12, a crew of LSCCF members surveyed the northwest corner of the Little Lake to gather information to provide to the Vermont Agency of Natural Resources as part of our plan to apply for a permit to do an experimental project in hydraulic dredging or other lake cleaning process. Below is the report of the survey, which was done by Bill Steinmetz, Fran Gilman, and Bob Short. The results seen below were compiled by Bob Short.

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Lake Depth Surveys, July 2007, March 2011

On July 15, 2007, a group of residents of Lake St. Catherine performed a depth survey of the Little Lake. The group used a thirty-foot probe marked off at two-foot intervals. Seventeen depth readings were taken, as seen below. The notations show approximate locations and indicate water depths, silt depth, the presence of weeds, and the total depth. As can be seen, the lake bottom is well over thirty feet in at lest seven locations. Silt depth ranges from zero to over 25 feet, with the majority of sites exceeding 15 feet. Weed cover at the south end of the lake is minimal, but the majority of the lake is heavily covered with a variety of weeds, and they are present at the surface of the water throughout most of the Little Lake.

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LSCCF Team Confirms Depth in Little Lake

auger_webA group of LSCCF Directors took advantage of the frozen lake surface to re-measure the depth to hard bottom in Little Lake on March 19. Their findings confirmed and enhanced a 2007 study reported in our Lake Restoration Strategy document. Fran Gilman, Bill Frye, and Bill Steinmetz ventured out with an auger supplied by Al Cote and drilled several holes in the ice at various locations on Little Lake. They lowered a graduated 40-foot probe, constructed by Fran, through the holes until the pole reached a firm, hard bottom, and recorded the depth. Most of the trials showed depths of over 30 feet, with one location too deep for the pole to reach bottom, confirming that there is at least one spot in Little Lake over 40 feet deep.

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