Base of the upper layer of the phase-three Elkhorn-Loup groundwater-flow model, north-central Nebraska

Scientific Investigations Map 3259
Prepared in cooperation with the Lower Elkhorn, Lower Loup, Lower Platte North, Middle Niobrara, and Upper Elkhorn Natural Resources Districts



The Elkhorn and Loup Rivers in Nebraska provide water for irrigation, recreation, hydropower produc­tion, aquatic life, and municipal water systems for the Omaha and Lincoln metropolitan areas. Groundwater is another important resource in the region and is extracted primarily for agricultural irrigation. Water managers of the area are interested in balancing and sustaining the long-term uses of these essential surface-water and groundwater resources. Thus, a cooperative study was established in 2006 to compile reliable data describing hydrogeologic properties and water-budget components and to improve the understanding of stream-aquifer interactions in the Elkhorn and Loup River Basins. A groundwater-flow model was constructed as part of the first two phases of that study as a tool for under­standing the effect of groundwater pumpage on stream base flow and the effects of management strategies on hydrologically connected groundwater and surface-water supplies. The third phase of the study was implemented to gain additional geologic knowledge and update the ELM with enhanced water-budget information and refined discretization of the model grid and stress periods. As part of that effort, the ELM is being reconstructed to include two vertical model layers, whereas phase-one and phase-two simulations represented the aquifer system using one vertical model layer. This report presents a map of and methods for developing the elevation of the base of the upper model layer for the phase-three ELM. Digital geospatial data of elevation contours and geologic log sites used to esti­mate elevation contours are available as part of this report.

Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title Base of the upper layer of the phase-three Elkhorn-Loup groundwater-flow model, north-central Nebraska
Series title Scientific Investigations Map
Series number 3259
DOI 10.3133/sim3259
Year Published 2013
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Nebraska Water Science Center
Description Map: 49 inches x 39 inches; Associated Metadata and GIS files
Country United States
State Nebraska
Online Only (Y/N) Y
Additional Online Files (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details