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The Watershed Assessment Model (WAM) has been used to simulate flow and water quality constituents for several Florida watersheds in support of Floridas TMDL program and other watershed restoration projects. WAM was set up and calibrated/validated for simulating both existing conditions and future watershed restoration strategies. WAM was used to simulate daily flows and constituents of interest, such as, nitrogen, phosphorus, total suspended solids, and BOD, for every watershed and each stream reach within the watersheds, as well as providing detailed spatial GIS maps of source loads throughout the watersheds. Florida watersheds for which WAM has been used include: Lower St. Johns River, Myakka River, North Lake Okeechobee, Suwannee River, Aucillia River, and Caloosahatchee River

The results of the WAM modeling program for TMDL development and other watershed restoration programs in Florida, as well as recent enhancements to the model, are described. The comparisons of measured and simulated values indicate that WAM has been reliably applied to new watersheds with little or no calibration. WAMs demonstrated ability to simulate the impacts of land use and management changes makes it a powerful tool in assisting planners and decision makers in the development of strategies to improve water quality.