A eutrophication model for a lake

Abstract Different lake models were tested against measured values. It was found that a model based upon phytoplankton population dynamics gave a better description than a model based upon Monod's kinetics. The calibration of the model showed that it was necessary to use a recently developed submodel for sediment—water nutrient exchange. Furthermore, the work showed that it was essential to include in the model three trophic levels, denitrification, a time dependent nitrogen input and Steele's expression for the grazing rate. A prediction for different waste-water treatment alternatives was worked out.