In order to assist a diverse group of stakeholders in managing the Shoal Lake Watershed a water quantity and quality model was developed. The water balance of the model is influenced by both runoff from the Canadian Shield and wetlands, as well as direct precipitation to the lake. a
large municipal withdrawal and to the influence of water exchanges between an adjacent lake which is controlled by Hydro Development Regulation, was also considered in the water balance. Two water-quality models, the Ontario Lakeshore Capacity Model and the WASP Model, are assessed in this
study. The Lakeshore Capacity Model is a steady-state phosphorus budget model which could easily transfer to the stakeholder groups once the model is calibrated. The results of the nutrient balance indicated that the majority of the existing nutrient loading is due to natural sources. The
WASP Model, although more complex and difficult to transfer directly to stakeholders, provides more realistic assimilation of dynamic algae, seasonal algae changes, as well as exchanges within Shoal Lake.
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