Model Model description Output metrics GIS-based sediment GIS-based assessment of relative differences in estimated historical and current sediment budgets. Forested area budgets based on roads, mass wasting, area in clearcuts, hillslopes, and erosion rate studies, and USFS modified WEPP (Elliot et al. 1995). Agricultural area budgets based on the modified universal soil loss equation (RUSLE) using soil erosivity, slope, and land use and land cover (Beechie et al. 2004, Flanigan and Livingstone 1995). 6th field HU summaries of annual yield (kg/yr); % ∆ between estimated historical and current conditions GIS-based hydrology GIS-based assessment of relative differences in estimated historical and current runoff estimated from land cover, land slope, and soil texture using the modified WEPP in forested areas (Elliot et al. 1995) and WEPP in agricultural areas; and coarser-scale impact ratings based on forested areas: % immature vegetation and road density; lowland areas: % impervious areas (Beamer et al. 2000, Booth and Jackson 1997, Dinicola 1989, Lunetta et al. 1997). 6th field HU summaries of % impaired due to impervious areas; % ∆ between estimated historical and current conditions