Surface runoff is the primary transport mechanism for many nonpoint source pollutants including pathogens, sediment, and most commonly used pesticides. The Soil Moisture Routing Model was developed to assist in making watershed management decisions for areas where variable source area hydrology is responsible for a considerable portion of total surface runoff. The model uses ArcView GIS to predict saturation excess overland flow in watersheds with shallow sloping soils. Elevation, soil, and land use information is combined to predict both soil moisture and surface runoff each day throughout the watershed.