This data set is one of many developed in support of The High Plains Groundwater Availability Project and the USGS Data Series Report: Geodatabase Compilation of Hydrogeologic, Remote Sensing, and Water-Budget-Component data for the High Plains aquifer, 2011 (DS 777). This dataset contains point vector data from the National Hydrography Dataset Plus (NHD+) 1:100,000 stream polyline data converted into points and attributed with elevation values in feet above sea level. Streams were initially included if they had a mean estimated base flow of more than 10 cubic feet per second (based on streamflow data from long-term streamflow-gaging stations operated by the USGS or the Nebraska Department of Natural Resources). The stream network then was expanded to include selected streams that were deemed hydrogeologically important but had a mean estimated base flow of less than 10 cubic feet per second.

This data set defines the boundary of the northern High Plains aquifer. It is one of many developed in support of The High Plains Groundwater Availability Project and the U.S. Geological Survey Data Series Report: Geodatabase Compilation of Hydrogeologic, Remote Sensing, and Water-Budget-Component data for the High Plains aquifer, 2011 (DS 777). The creation of the model grid is an important first step in developing a groundwater-flow model, because all model inputs including hydraulic properties, wells, and boundary conditions are assigned to the model cells. The northern High Plains groundwater-flow model boundary feature dataset contains three feature classes; the model grid cells for the northern High Plains groundwater-flow model in both polygon (cell) and point (centroid) format and the external boundary of the model. The model grid contains 449,175 cells, 565 rows and 795 columns. Each cell is 1,000 feet per side. The model grid is not rotated. The external boundary includes the active and inactive areas of the model.

This data set defines the boundary of the northern High Plains aquifer. It is one of many developed in support of The High Plains Groundwater Availability Project and the U.S. Geological Survey Data Series Report: Geodatabase Compilation of Hydrogeologic, Remote Sensing, and Water-Budget-Component data for the High Plains aquifer, 2011 (DS 777). The creation of the model grid is an important first step in developing a groundwater-flow model, because all model inputs including hydraulic properties, wells, and boundary conditions are assigned to the model cells. The northern High Plains groundwater-flow model boundary feature dataset contains three feature classes; the model grid cells for the northern High Plains groundwater-flow model in both polygon (cell) and point (centroid) format and the external boundary of the model. The model grid contains 449,175 cells, 565 rows and 795 columns. Each cell is 1,000 feet per side. The model grid is not rotated. The external boundary includes the active and inactive areas of the model.

This data set is one of many developed in support of The High Plains Groundwater Availability Project and the U.S. Geological Survey Data Series Report: Geodatabase Compilation of Hydrogeologic, Remote Sensing, and Water-Budget-Component data for the High Plains aquifer, 2011 (ds777). This dataset contains point vector data of 20,759 wells with 327,129 water-level measurement records located in areas overlying the northern High Plains aquifer in the United States. The northern High Plains aquifer underlies 61.7 million acres (96,400 square miles) in Colorado, Kansas, Nebraska, South Dakota, and Wyoming. These data were acquired from the U.S. Geological Survey National Water Information System (NWIS) and the High Plains water-level monitoring network maintained by Virginia McGuire. Included in this dataset is a point feature class (pts_WaterLevel_development) of water-level measurements in the northern High Plains aquifer for the northern High Plains groundwater-flow model development period October 1, 1940 to May 31, 2009 in 138 stress periods.

This data set is one of many developed in support of The High Plains Groundwater Availability Project and the U.S. Geological Survey Data Series Report: Geodatabase Compilation of Hydrogeologic, Remote Sensing, and Water-Budget-Component data for the High Plains aquifer, 2011 (ds777). This dataset contains point vector data of 20,759 wells with 327,129 water-level measurement records located in areas overlying the northern High Plains aquifer in the United States. The northern High Plains aquifer underlies 61.7 million acres (96,400 square miles) in Colorado, Kansas, Nebraska, South Dakota, and Wyoming. These data were acquired from the U.S. Geological Survey National Water Information System (NWIS) and the High Plains water-level monitoring network maintained by Virginia McGuire. Included in this dataset is a point feature class (pts_WaterLevel_development) of water-level measurements in the northern High Plains aquifer for the northern High Plains groundwater-flow model development period October 1, 1940 to May 31, 2009 in 138 stress periods.

This data set is one of many developed in support of The High Plains Groundwater Availability Project and the U.S. Geological Survey Data Series Report: Geodatabase Compilation of Hydrogeologic, Remote Sensing, and Water-Budget-Component data for the High Plains aquifer, 2011 (DS 777). The creation of the model grid is an important first step in developing a groundwater-flow model, because all model inputs including properties, wells, and boundary conditions are assigned to the model cells. The northern High Plains groundwater-flow model boundary feature dataset contains three feature classes; the model grid cells for the northern High Plains groundwater-flow model in both polygon (cell) and point (centroid) format and the external boundary of the model. The model grid contains 449,175 cells, 565 rows and 795 columns. Each cell is 1,000 feet per side. The model grid is not rotated. The external boundary includes the active and inactive areas of the model. The projection for the model grid and all feature classes in all geodatabases for this study are Albers Equal-Area Conic coordinate system, North American Datum1983.

This data set is one of many developed in support of The High Plains Groundwater Availability Project and the U.S. Geological Survey Data Series Report: Geodatabase Compilation of Hydrogeologic, Remote Sensing, and Water-Budget-Component data for the High Plains aquifer, 2011 (DS 777). The creation of the model grid is an important first step in developing a groundwater-flow model, because all model inputs including properties, wells, and boundary conditions are assigned to the model cells. The northern High Plains groundwater-flow model boundary feature dataset contains three feature classes; the model grid cells for the northern High Plains groundwater-flow model in both polygon (cell) and point (centroid) format and the external boundary of the model. The model grid contains 449,175 cells, 565 rows and 795 columns. Each cell is 1,000 feet per side. The model grid is not rotated. The external boundary includes the active and inactive areas of the model. The projection for the model grid and all feature classes in all geodatabases for this study are Albers Equal-Area Conic coordinate system, North American Datum1983.

Baseflow is the portion of streamflow derived from groundwater flow. It is an important component of the groundwater budget, and can be estimated using known total streamflow at given points through time. Daily streamflow data was collected from 25 streamflow gaging stations across the northern High Plains Groundwater Availability Study (NHPGAS) area from the National Water Information System (NWIS) and the Nebraska Department of Natural Resources Stream Gaging Data Bank. The data from each site was processed using the BFI program, version 4.15 (Wahl and Wahl, 2007) to determine the baseflow component of total streamflow at each site. The average daily baseflow was computed for the year of 1940. The resulting baseflow values were applied as calibration targets to the end of the predevelopment model.

Baseflow is the portion of streamflow derived from groundwater flow. It is an important component of the groundwater budget, and can be estimated using known total streamflow at given points through time. Daily streamflow data was collected from 25 streamflow gaging stations across the northern High Plains Groundwater Availability Study (NHPGAS) area from the National Water Information System (NWIS) and the Nebraska Department of Natural Resources Stream Gaging Data Bank. The data from each site was processed using the BFI program, version 4.15 (Wahl and Wahl, 2007) to determine the baseflow component of total streamflow at each site. The average daily baseflow was computed for the year of 1940. The resulting baseflow values were applied as calibration targets to the end of the predevelopment model.

Baseflow is the portion of streamflow derived from groundwater flow. It is an important component of the groundwater budget, and can be estimated using known total streamflow at given points through time. Daily streamflow data was collected from 91 streamflow gaging stations across the northern High Plains Groundwater Availability Study (NHPGAS) area from the National Water Information System (NWIS) and the Nebraska Department of Natural Resources Stream Gaging Data Bank. The data from each site was processed using the BFI program, version 4.15 (Wahl and Wahl, 2007) to determine the baseflow component of total streamflow at each site. The average daily baseflow was computed for the months of April and October, spanning the development period model (1940-2009). The resulting baseflow values were applied as calibration targets to corresponding stress periods.