The slug begins to enter the soil at the first precipitation event at a rate equal to the pore water velocity. Mass of the pollutant can be lost via liquid-phase decay or via migration out of the soil domain. The slug enters the soil at the velocity of the pore water which is the ratio of the recharge rate to the pore water content. Steady-state flow conditions are assumed. Homogeneous soil conditions are assumed.
Linear isotherms describe the partitioning of the pollutant between the liquid and soil phases.
First-order degradation of the pollutant is assumed. The water content of the soil is related to the hydraulic conductivity by a simple relationship. The model does not account for nonaqueous phase liquids or any flow conditions derived from variable density. Results should be compared for a series of simulations using a range to obtain an estimate of potential uncertainty. Click here for information.