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U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5137

A Graphical Modeling Tool for Evaluating Nitrogen Loading to and Nitrate Transport in Ground Water in the Mid-Snake Region, South-Central Idaho

Prepared in cooperation with Idaho Department of Environmental Quality and Cassia, Gooding, Jerome, Lincoln, Minidoka, and Twin Falls Counties

By David W. Clark, Kenneth D. Skinner, and David W. Pollock

Download the report (PDF, 4.66 MB)

Download Snake River Nitrate Scenario Simulator Software (ZIP, 13.2 MB)

Table of Contents

Conversion Factors, Datums, Abbreviated Water-Quality Units, Acronyms, and Symbols

Abstract

Introduction

Development of the Snake River Nitrate Scenario Simulator

Model Use and Guidance

Acknowledgments

References Cited

Appendix A. Detailed instructions for using SNRSS software.

Figures

Figure 1. Location of the study area, south-central Idaho.

Figure 2. Extent of a subregional ground-water flow model of the mid-Snake region within the eastern Snake River Plain regional model environment.

Figure 3. Nitrogen loading input representing 1998 for the study area, south-central Idaho.

Figure 4. Multiplication factor applied to the nitrogen loading layer during each flow model stress period.

Figure 5. Measured and simulated nitrate concentrations (nitrite + nitrate as nitrogen) in the mid-Snake region, south-central Idaho.

Figure 6. Measured and simulated nitrate concentrations (nitrite plus nitrate as nitrogen) at Box Canyon Spring, south-central Idaho, 1999-2001.

Figure 7. Simulated ground-water velocity from the subregional flow model in the mid-Snake region, south-central Idaho.

Figure 8. Predefined nitrogen loading zones in south-central Idaho used in the SRNSS flow and transport model.

Figure 9. Nitrogen input range by dairy cattle by zone in south-central Idaho.

Tables

Table 1. Nitrogen input values for source and land-use type for counties in the study area, south-central Idaho.

Table 2. Percentage of area occupied by nitrogen source types in each zone of the study area, south-central Idaho.

This report is available online in Portable Document Format (PDF). If you do not have the Adobe Acrobat PDF Reader, it is available for free download from Adobe Systems Incorporated.

Download the report (PDF, 4.66 MB)

Download Snake River Nitrate Scenario Simulator Software (ZIP, 13.2 MB)

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Send questions or comments about this report to the author, K.D. Skinner, (208) 387-1343.

For more information about USGS activities in Idaho, visit the USGS Idaho Water Science Center home page.

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