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P_LOAD - Phosphorus nutrient load in kg/ha/yr based on land cover classes The phosphorus nutrient load is calculated by multiplying a contribution factor by the the area of certain land cover types known to produce phosphorus. Default contribution factors are based on literature (Reckhow et al. 1980), but may be changed by the user. Reckhow, K.H., Beaulac, M. N., and Simpson, J. T. (1980). Modeling Phosphorus Loading and Lake Response Under Uncertainty: A Manual and Compilation of Export Coefficients. USEPA 440/5-80-011. Washington, DC: Office of Water Regulations and Standards, U.S. Environmental Protection Agency. |