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The Influence of Two Surfactants on Infiltration into a Water-Repellent Soil

Department of Environmental Sciences, Soil and Water Science Unit, University of California, Riverside, CA 92521

View larger version (17K): [in a new window]   Fig. 1. The surface tension of Surfactants A and B at different active ingredient concentrations.

View larger version (19K): [in a new window]   Fig. 2. The comparison of infiltration rates for Surfactant A and B as a function of time for various active ingredient concentrations in the 40-cm water-repellent sand columns and 20-cm ponded water depth. The arrows indicate the beginning time of solution seepage from the bottom of the columns.

View larger version (13K): [in a new window]   Fig. 3. The infiltration rates of ethanol solution (42%[v/v], 0.034 N m-1) as a function of time in the 40-cm water-repellent sand columns and 20-cm ponded depth.

View larger version (18K): [in a new window]   Fig. 4. The comparison of water infiltration rates at 20-cm ponded water depth as a function of time into 20-cm sand columns wet by various active ingredient concentrations of Surfactant A and B after oven-drying. Arrows indicate the beginning time of seepage.