Predicting Lake-Chain Quality with Augmentation

by John B. Erdmann, E. A. Hickok & Associates Inc, Wayzata, MN, USA,

Document Type: Proceeding Paper

Part of: Environmental Engineering


Steady-state mass-balance models of lake phosphorus are analyzed with regard to predicting augmentation (or dilution) effects. One form of these models employs a retention coefficient R, representing the fraction of input load that the lake retains each year in its bottom sediments. It is shown that the critical (i. e. , no-effect) phosphorus concentration for augmentation water is greater than the lake's pre-existing average concentration by the factor l/(l minus R). This result assumes R is approximately constant; evidence is presented to support the assumption for reasonable hydrologic changes. Model application to a chain of four connected lakes having a common water level (part of the Minneapolis Chain of Lakes) yielded interesting and useful results. (Edited author abstract. )

Subject Headings: Lakes | Water quality | Phosphorus | Nutrient pollution | Water pollution | Steady states | Dilution | Hydrology | Minnesota | United States

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