A lasting solution to lake ...

A lasting solution to lake eutrophication can only be developed by treating the problem at the source which is the drainage basin that feeds the lake.  A study should conducted to identify all sources of water and nutrients that flow into the lake.  These should then be analyzed to determine the actual quantities of nutrients (i.e., nitrogen, phosphorus and their chemical species at a minimum).  Rank the inputs to determine which sources contribute the most nutrients and which sources contribute the highest concentrations of nutrients.  Focus your attention on the inputs that contribute the largest quantities and highest concentrations of nutrients, determine if they are coming from point sources such as sewage treatment and industrial discharges or from area sources such as agricultural and urban runoff.  Devise and implement plans to decrease nutrient inputs at their sources.  As the nutrient inputs into the lake are decreased over time, the lake will respond favorably.