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Research ArticleResearch Section

Extension and validation of a geographic information system-based method for calculating the Revised Universal Soil Loss Equation length-slope factor for erosion risk assessments in large watersheds

M.F. Winchell, S.H. Jackson, A.M. Wadley and R. Srinivasan
Journal of Soil and Water Conservation May 2008, 63 (3) 105-111; DOI: https://doi.org/10.2489/jswc.63.3.105
M.F. Winchell
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S.H. Jackson
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A.M. Wadley
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R. Srinivasan
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Abstract

A geographic information system-based (GIS) method for estimating the length-slope (LS) factor of the Revised Universal Soil Loss Equation using national-scale datasets was developed and validated. The method was applied to approximately two-thirds of the Mississippi River basin, focusing on agricultural subwatersheds in the Midwest. The results were validated by comparing the GIS-based statistical distributions of LS-factor values with the distribution of LS-factors calculated from the Natural Resources Inventory database at the eight-digit watershed level. The GIS-based approach was shown to produce statistical distributions of LS-factor values very similar to those described by the Natural Resources Inventory database of field measurements, providing for the first time strong support for using GIS-based methods to represent the spatial heterogeneity and magnitude of LS-factors. Development and validation of the GIS-based approach is an important step toward conducting large-scale erosion potential assessments that have soil conservation implications in natural resources management, agronomy, and agrochemical exposure risk assessments.

Footnotes

  • Michael F. Winchell is a senior GIS specialist at Stone Environmental Inc., Montpelier, Vermont. Scott H. Jackson is a principal scientist managing North American Free Trade Agreement regulatory strategy and stewardship at BASF Corporation, Research Triangle Park, North Carolina. Adrian M. Wadley is a senior research scientist at Stone Environmental Inc., San Francisco, California. Raghavan Srinivasan is director of the Spatial Sciences Laboratory, Department of Ecosystem and Science Management, Texas A&M University, College Station, Texas.

  • © 2008 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 63 (3)
Journal of Soil and Water Conservation
Vol. 63, Issue 3
May/June 2008
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Extension and validation of a geographic information system-based method for calculating the Revised Universal Soil Loss Equation length-slope factor for erosion risk assessments in large watersheds
M.F. Winchell, S.H. Jackson, A.M. Wadley, R. Srinivasan
Journal of Soil and Water Conservation May 2008, 63 (3) 105-111; DOI: 10.2489/jswc.63.3.105

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Extension and validation of a geographic information system-based method for calculating the Revised Universal Soil Loss Equation length-slope factor for erosion risk assessments in large watersheds
M.F. Winchell, S.H. Jackson, A.M. Wadley, R. Srinivasan
Journal of Soil and Water Conservation May 2008, 63 (3) 105-111; DOI: 10.2489/jswc.63.3.105
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