Table 2. SWAT input data for historic and future scenarios for the Upper Colorado River Basin.

Description	Reference	Application	Source
30 meter Digital Elevation Model	Gesch et al., 2002 [80]	Watershed delineation and stream slopes	http://ned.usgs.gov/
National Land Cover Database	Homer, 2001 [81]	Land use properties	http://www.mrlc.gov/
State Soil Geographic Database (STATSGO)	Wolock, 1997 [82]	Soil properties	http://soildatamart.nrcs.usda.gov/
1/8 degree resolution daily climate data	Maurer et al., 2002 [47]	Precipitation, maximum and minimum temperature, wind speed input data	http://www.engr.scu.edu/~emaurer/data.shtml
Unimpaired observed streamflow data	USBR, 2005 [45]; Slack et al., 1993 [46]	SWAT model calibration	http://www.usbr.gov/lc/region/g4000/NaturalFlow/
			http://pubs.usgs.gov/wri/wri934076/1st_page.html