Laboratory experiments have been conducted to test two such models developed by the authors. Fundamental transport parameters for the media were determined using a flow-pump system. One-dimensional spill simulations of a non-aqueous phase liquid were conducted in vertical soil columns. One of the models, which is similar to concept to the Green-Ampt type infiltration models, assumes sharp leading and trailing fronts. It deviates from the experimental results for long modeling times. The second model based on kinematic wave formulation and the method of characteristics approximates the gradual decline in saturation behind the front and simulates the spill behavior well. Based on these experimental evaluations, the suitability and limitations of these simple models are determined.

"The information in this document has been funded in part by the United States Environmental Protection Agency under CR-816807 to the University of Colorado at Boulder"--Page ii. "EPA/600/R-94/197." "November 1994."