Estimated daily loads of nutrients, sediment, and chloride at USGS edge-of-field stations, in Wisconsin, water years 2012-17

As part of the Great Lakes Restoration Initiative, the U.S. Department of Agriculture, Natural Resources Conservation Service; U.S. Environmental Protection Agency; and the U.S. Geological Survey (USGS) have partnered to evaluate agricultural conservation practices focused on nutrient management. Monitoring methods allow for rapid assessment of water-quality changes in response to conservation efforts by focusing on subsurface-tile drainage and direct surface runoff from fields. Estimated daily loads presented within this dataset are from five surface-runoff monitoring stations (USGS station identification number 441624088045601, approximated drainage area of 4.17 hectare; USGS station identification number 441546088082001, approximated drainage area of 11.0 hectare; USGS station identification number 441520880845001, approximated drainage area of 3.20 hectare; USGS station identification number 442119088085501, approximated drainage area of 1.94 hectare; USGS station identification number 442114088085701, approximated drainage area of 10.4 hectare) and one tile-runoff monitoring station (USGS station identification number 441520088045002; approximated drainage area of 2.02 hectare). The monitored fields are row-crop parcels planted in a biennial corn-soybean crop rotation. Best-management practices were applied during part of the monitoring period. Note: Daily load computations are presented directly as they were output from the USGS Graphical Constituent Loading Analysis System (GCLAS) program and do not represent the degree of accuracy of the estimates.