Table 1.

Summarized Information of the Input Data Used in the SWAT Model

Data-set	Description of data	Source of data
Elevation	90 meter digital elevation model	USGS (2016)
Soil	1:250,000 STATSGO soil map	USDA-NRCS (2013)
Land use	Assignment of crop rotations or other land use based on Cropland Data Layers data from 2008 to 2009	USDA-NASS (2016)
Weather	Historic daily precipitation, maximum temperatures, and minimum temperatures from 1,721 NWS stations	NCDC (2016)
Point sources	Regression of population and SPARROW model outputs	Schwarz et al. (2006)
Fertilizer input	Nitrogen and phosphorus rates applied in corn, soybean, spring wheat and winter wheat	USDA-NASS (2017)
Tillage practices	No-till, mulch till, reduced till, and conventional till practices	Baker (2011)
Reservoirs	Reservoirs with maximum storage larger than 25,000 acre feet	USACE (2012)

Abbreviation: SWAT, Soil and Water Assessment Tool.