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Riverine nutrient load reduction through modeling-simulation directed field targeting of best management practices
Unformatted Document Text:  Riverine Nutrient Load Reductions Through Modeling/Simulation Directed Field Targeting of Best Management Practices Timothy W. Appelboom USDA-ARS Soil and Water Unit 4115 Gourrier Ave. Baton Rouge, LA. 70808 Phone: (225)-578-0745 FAX: (225)-757-7728 James L. Fouss USDA-ARS Soil and Water Unit 4115 Gourrier Ave. Baton Rouge, LA. 70808 Phone: (225)-578-0743 FAX: (225)-757-7728 Abstract Increased agricultural production has led to a reduction in water quality. In the case of the Mississippi River Basin, increased nutrient loads linked to agricultural crop production have contributed to the hypoxic zone along the Louisiana and Texas Gulf Coast. Meanwhile, funding for protection or improvement of surface water quality from agricultural runoff has been decreasing. It is becoming increasingly important that available funds be spent where it will result in the most beneficial nutrient reductions. The objective of this study is to use the Annualized Agricultural Non-Point Source Pollutant Loading Model (AnnAGNPS) to simulate the different placements of best management practices (BMPs) within a watershed to maximize nutrient load reductions at the outlet while minimizing costs. These objectives will be accomplished using the computer simulation model AnnAGNPS along with economic evaluations of each land use scenario applied to the Cabin-Teele sub-watershed in northeastern Louisiana. In a series of simulations, BMPs will be placed at selected locations within the sub-watershed to determine how each BMP and location combination effect the nutrient load at the watershed outlet. The expected results of this study is to demonstrate that field targeting of BMPs within a watershed through modeling and simulation can help to maximize the reduction of agricultural drainage water nutrients while minimizing costs.

Authors: Appelboom, Timothy. and Fouss, James.
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Riverine Nutrient Load Reductions Through 
Modeling/Simulation Directed Field Targeting of Best 
Management Practices
Timothy W. Appelboom
USDA-ARS Soil and Water Unit 
4115 Gourrier Ave. Baton Rouge, LA.  70808
Phone: (225)-578-0745
FAX: (225)-757-7728
 James L. Fouss
USDA-ARS Soil and Water Unit 
4115 Gourrier Ave. Baton Rouge, LA.  70808
Phone: (225)-578-0743
FAX: (225)-757-7728
Increased agricultural production has led to a reduction in water quality. In the case 
of the Mississippi River Basin, increased nutrient loads linked to agricultural crop 
production have contributed to the hypoxic zone along the Louisiana and Texas Gulf Coast. 
Meanwhile, funding for protection or improvement of surface water quality from 
agricultural runoff has been decreasing. It is becoming increasingly important that available 
funds be spent where it will result in the most beneficial nutrient reductions. The objective 
of this study is to use the Annualized Agricultural Non-Point Source Pollutant Loading 
Model (AnnAGNPS) to simulate the different placements of best management practices 
(BMPs) within a watershed to maximize nutrient load reductions at the outlet while 
minimizing costs. These objectives will be accomplished using the computer simulation 
model AnnAGNPS along with economic evaluations of each land use scenario applied to 
the Cabin-Teele sub-watershed in northeastern Louisiana. In a series of simulations, BMPs 
will be placed at selected locations within the sub-watershed to determine how each BMP 
and location combination effect the nutrient load at the watershed outlet. The expected 
results of this study is to demonstrate that field targeting of BMPs within a watershed 
through modeling and simulation can help to maximize the reduction of agricultural 
drainage water nutrients while minimizing costs.

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