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Water QualityWater Quality ModelsAgricultural Non-Point Source Pollution Model (AGNPS) is an USDA - Agricultural
Research Service developed computer program designed to evaluate non point
source pollution from agricultural watersheds. Outputs related to soluble
nitrogen and phosphorus for surface water and infiltration are provided.
Sediment yield and runoff are calculated, and sediment transported nitrogen
and phosphorus are determined. Nutrient concentrations from feedlots and
other point sources and chemical oxygen demand are modeled. Individual
feedlot potential ratings can also be derived using the model.
AGNPS DRAINMOD is a computer program that simulates the performance of water table management systems. It is specifically adapted for soils that have a high water table. Hydrologic components, such as subsurface drainage, sub-irrigation, evapotranspiration, and surface runoff, are quantified. The model predicts water table depth, drainage rates, surface runoff, evapotranspiration, irrigation volume, and crop yield. Alternative management systems may be evaluated with regard to excess water available to transport nutrients, pesticides, salinity, and heavy metals. DRAINMOD Erosion/Productivity Impact Calculator (EPIC) is an USDA - Agricultural
Research Service developed field sized model used to determine the effect
of management strategies on water quality. EPIC provides the following
outputs: (1) Water movement - volume of surface runoff, days of runoff,
and percolation below the root zone. (2) N loss in percolate and subsurface
flow used to assess hazards to ground water. (3) Nutrient loss in surface
runoff and erosion - soluble and attached N, and soluble P and P loss with
sediment. (4) Erosion assessment - sediment loss and associated chemicals.
(5) Pesticide loss in runoff and below the root zone - for selected pesticides.
EPIC Ground water Loading Effects of Agricultural Management Systems (GLEAMS)
is an USDA - Agricultural Research Service field scale model that was developed
as an extension of CREAMS. GLEAMS evaluates potential pesticide leaching
below the root zone, pesticide movement with surface runoff, and sediment
losses from a field. It is a tool for evaluating management systems and
does not provide an absolute prediction of pollutant loading. Nitrate Leaching and Economic Analysis Package (NLEAP) is a computer model
for field scale assessment of potential nitrate N leaching. Basic information
concerning farm management practices, soils, and climate are translated
into projected N budgets and nitrate N leaching indices.
NLEAP
Illinois FarmAsyst, which stands for Illinois' Farmstead Assessment System, provides information on how farmstead activities may affect drinking water. "FarmAsyst" consists of 12 worksheets to assess individual farm practices, and accompanying publications containing recommendations on modifying practices to minimize farmstead pollution risks relative to groundwater and other water resources. Other Water Quality LinksAgricultural
Phosphorus and Eutrophication
For more information contact Don Pitts
Contact: Don.Pitts@il.usda.gov
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