Predicting Infiltration Parameters for a Road Sediment Model

METHODS for predicting Green-Ampt infiltration parameters for very coarse-textured soils are not well established. Before accurate runoff and erosion predictions can be made for these soils, a large data base and correlations to other soil properties are required. Runoff data were collected and infiltration parameters were determined for simulated rainfall events on forest roads. These results were combined with data from similar studies, and predictive equations were established for the Green-Ampt infiltration parameters using soil texture and porosity. The equations account for 70% of the variation in hydraulic conductivity and 88% of the variation in capillary suction head.