EPIC: Environmental Policy Integrated Climate Model


 Environmental Policy Integrated Climate (EPIC) model is a cropping systems model that was developed to estimate soil productivity as affected by erosion as part of the Soil and Water Resources Conservation Act analysis for 1985.  EPIC simulates approximately eighty crops with one crop growth model using unique parameter values for each crop.  It predicts effects of management decisions on soil, water, nutrient and pesticide movements, and their combined impact on soil loss, water quality, and crop yields for areas with homogeneous soils and management. 



EPIC functions on a daily time step and can simulate hundreds of years.  Since the initial development, EPIC has been continually improving through the additions of algorithms to simulate water quality, nutrient cycling, climate change, and the effects of atmospheric carbon dioxide.  It can be configured for a wide range of crop rotations and other vegetative systems, tillage systems, and other management practices.  The model can also assess the cost of erosion for determining optimal management strategies.

Examples of EPIC applications include assessments of:

  • relative comparisons between different erosion class soils
  • erosion losses and erosion impacts on crop productivity
  • effects of different nutrient treatments
  • surface runoff and leaching of nitrogen and phosphorous losses from fertilizer and manure applications
  • leaching and runoff from pesticide applications
  • soil erosion losses from wind erosion
  • climate change and drought impacts on crop yield and soil erosion
  • development of agricultural management practices that are effective at sequestering soil carbon
  • sediment and nutrient losses as a function of different tillage systems, crop rotations, and fertilizer rates
  • impacts of different irrigation amounts and timings
  • economic-environmental analyses in response to alternative cropping systems, management practices, and other scenarios
  • nutrient and pesticide movement estimates for alternative farming systems for water quality analysis

Model Interfaces:

Almanac,  CroPMan,  WinEPIC,  iEPIC



EPIC User’s Guide: The user’s guide provides detatiled information about EPIC as well as How-to information for setting up the program, creating runs, setting up batch runs, and viewing/analyzing output for EPIC v.0509.

EPIC Fact Sheet 2012


Support Team:

Jimmy R. Williams, Ph.D.
Senior Research Scientist
(254) 774-6124
Avery Meinardus
Programmer I
(254) 774-6110
Evelyn Steglich, M.S.
(254) 774-6672




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