CADIL: model documentation for chemical adsorption and degradation in land

CADIL, a computer model simulating chemical transport through soils, was developed from the SCHEM model (an earlier soil chemical model developed by Begovich and Jackson at Oak Ridge National Laboratory (ORNL/NSF/EATC-16)) and was linked to AGTEHM (a terrestrial ecosystem hydrology model for agricultural applications developed by Hetrick, Holdeman, and Luxmoore at Oak Ridge National Laboratory (ORNL/TM-7856)). CADIL simulates deposition, infiltration, adsorption, and degradation of chemicals in the soil. A soil temperature model is included to model the effect of temperature on chemical degradation. Both macropore and matrix flows of chemicals in soil water are modeled. The theory and model algorithms are described. The model is applied to several example cases to show parametric effects. Sample input and output as well as FORTRAN source listings are included. 11 references, 10 figures, 9 tables.