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M. Levent Kavvas, Z-Q Chen, Hafzullah Aksoy, Jaeyoung Yoon Department of Civil and Environmental Engineering University of California, Davis, CA 95616 Abstract Based on the developed watershed hydrology model, recent efforts were concentrated on the development of erosion and sediment transport model for the period 2000-2001. As a result, we now have a fully physically Ð based erosion and sediment transport model for both upland portion and stream portion of a watershed. The developed model was applied to Ward Creek watershed, near Tahoe City, using the winter event of 1981 to test the performance of the model. The model was successful in simulating the observed sediment load at the mouth of the watershed (Figure 1). More importantly, the model was able to capture the spatial pattern of sediment load within the watershed (Figure 2). This particular feature of the model is a valuable asset in pinpointing the hot spots within the watershed that requires special attention in the planning stage for restoration projects. The model can also be used as a tool to prioritize competing management scenarios by performing a cost Ð benefit analysis. Development of a nutrient transport module is well under way for the completion of the overall transport module.  Figure 1. Comparison of observed daily sediment load (Red Line) with simulated daily sediment load (Black Line)  Figure 2. Spatial distribution of daily sediment load from subbasins within Ward Creek watershed on the 10th day during the simulation period |