Abstract
DWSM, a Dynamic Watershed Simulation Model has been developed to meet anemerging need of improved models for simulating surface and subsurface runoff, soil erosion,and entrainment and transport of sediment and agricultural chemicals in large agriculturalwatersheds during severe rainfall events. The model reasonably predicted water and sedimentdischarges in the 100-km2Big Ditch and 251-km2Court Creek watersheds in Illinois. Scalingeffects on parameters and model results due to alternative subdivision sizes were analyzed onthe Big Ditch watershed. Stream segments in the Court Creek watershed were ranked based ontheir peak flows and sediment yields; and the overland elements were ranked based on unit-widthpeak flows and unit-width sediment yields from a historical storm instead of a designstorm. The rankings were found useful for prioritizing and planning restoration.
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