Base of aquifer contours for the Northern High Plains aquifer

Several pre-existing datasets that characterize portions of the Northern High Plains aquifer base were merged together, and interpretively refined with test hole data, in order to define the entire base of the Northern High Plains aquifer. This digital dataset consists of the aquifer base altitude contours (100-foot contour interval) for the northern portion of the High Plains aquifer in the central United States. This was used as the lower boundary condition for a computer simulation model being used for a hydrologic study of the Northern High Plains