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DWSM, a Dynamic Watershed Simulation Model has been developed to meet an emerging need of improved models for simulating surface and subsurface runoff, soil erosion, and entrainment and transport of sediment and agricultural chemicals in large agricultural watersheds during severe rainfall events. The model reasonably predicted water and sediment discharges in the 100-km 2 Big Ditch and 251-km 2 Court Creek watersheds in Illinois. Scaling effects on parameters and model results due to alternative subdivision sizes were analyzed on the Big Ditch watershed. Stream segments in the Court Creek watershed were ranked based on their peak flows and sediment yields; and the overland elements were ranked based on unit-width peak flows and unit-width sediment yields from a historical storm instead of a design storm. The rankings were found useful for prioritizing and planning restoration.