AGNPSAgricultural Nonpoint Source Pollution Model
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Young RA, Onstad CA, Bosch DD, Anderson WP (1987) AGNPS, Agricultural-Non-Point-Source Pollution model: a large watershed analysis tool.
says that NRCS planners use AGNPS for watersheds as large as 500 square miles.
What AGNPS does that no other model can do is allow us to track pollutants back to their source," Theurer says.
AGNPS, Agricultural Nonpoint Source Pollution Model.
The objectives of this study were to determine if the coupled AGNPS watershed and BATHTUB lake models accurately simulated actual lake water quality conditions in three contrasting subbasins and subwatersheds of Clinton Lake, Kansas, and to demonstrate the use of the coupled model for simulating lake response to changes in watershed land use and management.
The AGNPS model topographic parameters, including flow direction, receiving cell number, land slope, slope shape, and channel type, were determined by visual inspection of the 7.
The application of the Soil Conservation Service Curve Number (SCS-CN) method (SCS 1968) in the AGNPS model with improved estimation of antecedent moisture condition (AMC) ratios is another important aspect of this research.
AGNPS predicts soil erosion and nutrient transport/loadings from agricultural watersheds for real or hypothetical storms.
It is a enhanced continuous version of AGNPS, a watershed event model that has received extensive evaluation and validation throughout the United States and internationally (Bingner et al.
The use of AGNPS provides a framework that agencies can utilize to target their resources to collect information that describes their watershed, select monitoring stations to assess the levels of pollutants and perform validation of the simulations, determine pollutant sources, and design alternatives to meet water quality standards.
Further linkages to other models, such as AGNPS, may be available in the future.
Other m odels that use flow-routing algorithms and GIS maps to predict erosion or runoff include ANSWERS, AGNPS, and SWAT (Srinivasan and Arnold 1994).