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Estimation of the Water Quality Benefits of Conservation Practices implemented on the Cropland in the Upper Mississippi River Basin

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Abstract:

The Conservation Effects Assessment Project (CEAP) was initiated by the USDA to quantify the environmental benefits of conservation practices for cropland at the national level. As part of the national assessment, specific water quality issues in various regions are examined. For this assessment, an approach involving modeling and farmer surveys is used. The modeling strategy involves using a farm-scale model Agricultural Policy/Environmental Extender (APEX) and a watershed scale model Soil and Water Assessment Tool (SWAT) with GIS databases. APEX is used to simulate the conservation practices on cultivated cropland. Farmer surveys conducted on a subset of National Resource Inventory sample points provide information on current farming activities and conservation practices for APEX. Output from APEX is input into SWAT in the HUMUS (Hydrologic Unit Modeling for the United States) model setup. SWAT simulates non-cultivated land including pasture, range, forest, wetland and urban lands. The model routes the pollutants generated from non-cultivated land and point sources along with APEX loadings (from cultivated land) to each 8-digit and 4-digit watersheds and finally to the outlet of the river basin. The loadings generated by APEX for cultivated cropland with conservation practices currently in use is input to HUMUS/SWAT watershed modeling for the “Current Conservation Condition” scenario. The loadings generated by APEX without conservation practices are input to HUMUS/SWAT watershed modeling for the “No Practices” scenario. Water quality benefits of the practices are determined by comparing SWAT model outputs for these two scenarios at 8-digit/4-digit watersheds in a river basin. Benefits obtained from the practices are reported by reductions in in-stream concentrations and loadings of sediment and nutrients at major locations along the river system. This paper focuses on the benefits of conservation practices implemented on the cropland in the Upper Mississippi River Basin
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Association:
Name: SOIL AND WATER CONSERVATION SOCIETY
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http://www.swcs.org


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URL: http://citation.allacademic.com/meta/p270373_index.html
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MLA Citation:

Santhi, C.., Kannan, N.. and Arnold, Jeff. "Estimation of the Water Quality Benefits of Conservation Practices implemented on the Cropland in the Upper Mississippi River Basin" Paper presented at the annual meeting of the SOIL AND WATER CONSERVATION SOCIETY, TBA, Tucson, Arizona, <Not Available>. 2013-12-14 <http://citation.allacademic.com/meta/p270373_index.html>

APA Citation:

Santhi, C. , Kannan, N. and Arnold, J. G. "Estimation of the Water Quality Benefits of Conservation Practices implemented on the Cropland in the Upper Mississippi River Basin" Paper presented at the annual meeting of the SOIL AND WATER CONSERVATION SOCIETY, TBA, Tucson, Arizona <Not Available>. 2013-12-14 from http://citation.allacademic.com/meta/p270373_index.html

Publication Type: Abstract
Abstract: The Conservation Effects Assessment Project (CEAP) was initiated by the USDA to quantify the environmental benefits of conservation practices for cropland at the national level. As part of the national assessment, specific water quality issues in various regions are examined. For this assessment, an approach involving modeling and farmer surveys is used. The modeling strategy involves using a farm-scale model Agricultural Policy/Environmental Extender (APEX) and a watershed scale model Soil and Water Assessment Tool (SWAT) with GIS databases. APEX is used to simulate the conservation practices on cultivated cropland. Farmer surveys conducted on a subset of National Resource Inventory sample points provide information on current farming activities and conservation practices for APEX. Output from APEX is input into SWAT in the HUMUS (Hydrologic Unit Modeling for the United States) model setup. SWAT simulates non-cultivated land including pasture, range, forest, wetland and urban lands. The model routes the pollutants generated from non-cultivated land and point sources along with APEX loadings (from cultivated land) to each 8-digit and 4-digit watersheds and finally to the outlet of the river basin. The loadings generated by APEX for cultivated cropland with conservation practices currently in use is input to HUMUS/SWAT watershed modeling for the “Current Conservation Condition” scenario. The loadings generated by APEX without conservation practices are input to HUMUS/SWAT watershed modeling for the “No Practices” scenario. Water quality benefits of the practices are determined by comparing SWAT model outputs for these two scenarios at 8-digit/4-digit watersheds in a river basin. Benefits obtained from the practices are reported by reductions in in-stream concentrations and loadings of sediment and nutrients at major locations along the river system. This paper focuses on the benefits of conservation practices implemented on the cropland in the Upper Mississippi River Basin

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