Agricultural nonpoint source pollution model
(AGNPS) is a tool used for evaluating the effect of management
decisions impacting a watershed system. The
single event model of AGNPS was developed during the
1980s and 1990s (USDA Agricultural Research Service,
1995; Young et al. 1989). AnnAGNPS, an annualized
AGNPS is an update of the single event AGNPS and is
able to simulate hydrology of a watershed continuously
over an annual or longer period (Bingner and Theurer,
2001). Compared to the single event AGNPS,
AnnAGNPS consists of a system of modules, such as
an input data preparation model, a flownet generator, a
synthetic weather generator, a pollutant loading model,
and an output processor model, to improve the capability
of the program and to automate many of the input data
preparation steps for large watershed analysis
(http://www.sedlab.olemiss.edu/agnps). While able to
automate some model input processing, these modules
are not integrated with a GIS and thus do not allow processing,
checking, editing, and displaying input and output
data in a map format within a GIS directly. For
example, the output data can be displayed in table format,
but not in map format in the current version of
AnnAGNPS, which affects examination and analysis of
spatial pattern of hydrologic phenomena throughout a
watershed.
Agricultural nonpoint source pollution model(AGNPS) is a tool used for evaluating the effect of managementdecisions impacting a watershed system. Thesingle event model of AGNPS was developed during the1980s and 1990s (USDA Agricultural Research Service,1995; Young et al. 1989). AnnAGNPS, an annualizedAGNPS is an update of the single event AGNPS and isable to simulate hydrology of a watershed continuouslyover an annual or longer period (Bingner and Theurer,2001). Compared to the single event AGNPS,AnnAGNPS consists of a system of modules, such asan input data preparation model, a flownet generator, asynthetic weather generator, a pollutant loading model,and an output processor model, to improve the capabilityof the program and to automate many of the input datapreparation steps for large watershed analysis(http://www.sedlab.olemiss.edu/agnps). While able toautomate some model input processing, these modulesare not integrated with a GIS and thus do not allow processing,checking, editing, and displaying input and outputdata in a map format within a GIS directly. Forexample, the output data can be displayed in table format,but not in map format in the current version ofAnnAGNPS, which affects examination and analysis ofspatial pattern of hydrologic phenomena throughout awatershed.
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