DS-777 Spatial Location the Model Cell Boundaries for the Northern High Plains Groundwater-Flow Model in Parts of Colorado, Kansas, Nebraska, South Dakota, and Wyoming

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.