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Research ArticleResearch Section

Daily estimates of rainfall, water runoff, and soil erosion in Iowa

R. Cruse, D. Flanagan, J. Frankenberger, B. Gelder, D. Herzmann, D. James, W. Krajewski, M. Kraszewski, J. Laflen, J. Opsomer and D. Todey
Journal of Soil and Water Conservation July 2006, 61 (4) 191-199;
R. Cruse
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D. Flanagan
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J. Frankenberger
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B. Gelder
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D. Herzmann
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D. James
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W. Krajewski
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M. Kraszewski
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J. Laflen
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J. Opsomer
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D. Todey
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ABSTRACT:

The major water quality impairment in the Midwest United States is sediment eroded from agricultural lands. Yet, few understand where or when erosion occurs, or the dynamics of soil erosion, the relative impact of precipitation, topography, land management and severe events over time and space. The objectives of this project are to: 1) develop methodology for estimating near real time spatial and temporal soil erosion and water runoff losses; and 2) explore issues in applying the method to a large area by setting up and running a prototype system for the state of Iowa. To accomplish this, soil erosion and water runoff loss are estimated daily at the township level (∼10 by ∼10 km area) (∼6.2 mi)2 and a map is posted on the Internet daily showing precipitation with runoff and soil erosion estimates for every Iowa township. We use Water Erosion Prediction Project (WEPP), a daily simulation model, to compute soil erosion and surface runoff. WEPP uses accumulated precipitation by 15-minute periods obtained with NEXRAD radar. Other needed weather data are obtained from an Iowa weather network. The National Resources Inventory provides soil, topography, cropping and management information required for running WEPP. Daily and annual spatial precipitation, runoff and erosion estimates illustrate a high level of spatial variability related to topography, precipitation characteristics, soils and management practices.

Footnotes

  • Richard Cruse is a professor and Brian Gelder is a research assistant in the Department of Agronomy at Iowa State University in Ames, Iowa. Dennis Flanagan an agricultural engineer at the National Soil Erosion Research Laboratory for the USDA-ARS in West Lafayette, Indiana. Jim Frankenberger is an IT specialist at the National Soil Erosion Research Laboratory for the USDA-ARS in West Lafayette, Indiana. Daryl Herzmann is a program assistant in the Department of Agronomy at Iowa State University in Ames, Iowa. David James is a geographic information specialist at the National Soil Tilth Laboratory for the USDA-ARS in Ames, Iowa. Witold Krajewski is a professor with the Department of Civil and Environmental Engineering at the University of Iowa in Iowa City, Iowa. Michal Kraszewski is a research assistant in the Department of Civil and Environmental Engineering at the University of Iowa in Iowa City, Iowa. John Laflen is currently retired from the USDA-ARS in Buffalo Center, Iowa. Jean Opsomer is a professor in the Department of Statistics at Iowa State University in Ames, Iowa. Dennis Todey is the extension state climatologist for the Department of Ag and Biosystems Engineering at South Dakota State University in Brookings, South Dakota.

  • Copyright 2006 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 61 (4)
Journal of Soil and Water Conservation
Vol. 61, Issue 4
July/August 2006
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Daily estimates of rainfall, water runoff, and soil erosion in Iowa
R. Cruse, D. Flanagan, J. Frankenberger, B. Gelder, D. Herzmann, D. James, W. Krajewski, M. Kraszewski, J. Laflen, J. Opsomer, D. Todey
Journal of Soil and Water Conservation Jul 2006, 61 (4) 191-199;

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Daily estimates of rainfall, water runoff, and soil erosion in Iowa
R. Cruse, D. Flanagan, J. Frankenberger, B. Gelder, D. Herzmann, D. James, W. Krajewski, M. Kraszewski, J. Laflen, J. Opsomer, D. Todey
Journal of Soil and Water Conservation Jul 2006, 61 (4) 191-199;
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