Diagnostic & Feasibility Study (1998)
In April 1998, the Green Lake Sanitary District (GLSD) was awarded a WDNR Lake Protection Grant to help reduce phosphorus and sediment loading from non-point sources to Green Lake by 35%. Specific studies were conducted to better understand (1) the origins of non-point pollution, (2) the history of how Green Lake’s water quality has changed over time and (3) the amounts of nutrients leaving and entering Green Lake (i.e. nutrient budget). Collectively, this important information was used to construct earthen best management practices (BMPs) that would reduce non-point pollution.
Upland Soil and Barnyard Watershed Inventory (1998-1999)
In an effort to better understand the origins and amount of non-point pollution in the Big Green Lake Watershed, an updated inventory of the barnyards and upland soils was performed in 1998-1999. Studying these potential sources of non-point pollution was important because sediment, nutrients, pesticides, and bacteria are pollutants that can be carried from rural land into Big Green Lake.
Big Green Lake Sediment Core Sampling (1999)
In 1999, sediment cores were extracted from 4 sites throughout Green Lake to better understand how its water quality had changed over time. Paleoecology, or core sampling, answered the following questions: how has the condition of the lake changed, when did this occur, what were the causes, and what were the historical condition of the lake?
Lake Water Quality Model Study for Big Green Lake (1999)
Water professionals developed a water and nutrient budget for the lake as well as a water quality model which was used in the goal setting process to evaluate the impact of watershed pollutant load reduction on water quality improvement.
The DFS’s project team consisted of representatives from Green Lake and Fond du Lac County Land Conservation Departments, the Green Lake Sanitary District, the Green Lake Association, the WDNR, Fox Wolf Basin, and the City of Ripon.