Hydraulic conductivity (K) and sorptivity (S) of two layers with different textural classes of a Fluvents soil from Flocos dams, located in Tuparetama, PE, Brazil were determined using the cumulative infiltration data measured with an infiltrometer disk. During the infiltration experiments, water was applied to the soil by an infiltrometer disk at potentials equivalent to 0, -3, -6 e -12 cm of water columm. Three methods were used to evaluate K and S: i) van Genuchten (VG); ii) Russo (GR); e iii) Zhang & van Genuchten (ZV). These methods based on the previous knowledge of the soil-moisture characteristic curve, which were obtained by the adjustment of the functions proposed by each method. The equation of cumulative infiltration described with precision the infiltration experiments, and yielded determination coefficients (R²) greater than 0.995. The method GR is the less adequate, since it systematically overestimated values and did not predict well the normalized K for the two soil layers. On the other hand, the VG method yielded good predictions of normalized K for both soil layers.
hydraulic conductivity; sorptivity; and disk infiltrometer
