Brusseau, M.L., 429 Shantz Bldg., 38 Soil and Water Science Department, University of Arizona, Tucson, AZ 85721, USA
Gerstl, Z., Institute of Soil and Water, 50250 Bet Dagan, Israel
Augustijn, D., Soil and Water Science Department, University of Florida, Gainesville, FL 32611, United States
Rao, P.S.C., Soil and Water Science Department, University of Florida, Gainesville, FL 32611, United States

The capability of the first-order, dual-porosity model, which explicitly accounts for non-ideal transport caused by the presence of 'immobile' water, to predict the non-ideal transport of non-sorbing solute in a constructed aggregated soil has been investigated. Miscible-displacement experiments performed with a well-characterized aggregated soil and a non-reactive tracer (pentafluorobenzoate) served as the source of the data. Values for the input parameters associated with physical non-equilibrium were determined independently and compared with values obtained by curve fitting of the experimental measurements. The calculated and optimized values compared well, suggesting that the non-equilibrium parameters represent actual physical phenomena. © 1994.