Erosion-Productivity Impact Calculator as Formulated for the Resource Conservation Act Appraisal

摘要

The Erosion-Productivity Impact Calculator (EPIC) model measures the effects of erosion on soil productivity and long-range resource capacity. EPIC is a production function model which simulates the interaction among weather, hydrology, erosion, plant nutrients, plant growth, soil, tillage and management, and plant environmental control submodels. The report describes the model briefly, but concentrates on data and information systems developed to support the model for use in the U.S. Department of Agriculture's 1985 appraisal of resource conditions and trends required by the Soil and Water Resources Conservation Act of 1977.