Technical Abstract: Concerns with the presence of agricultural chemicals in groundwater have drawn attention toward the processes of chemical transport in field soil. The hydraulic and preferential flow properties of a soil play an active role in the transport of chemicals to groundwater. In this study the hydraulic conductivity (K) and preferential flow parameters (immobile water content and mass exchange coefficient) and the mobile/immobile domain model were investigated by using a recently described in situ technique. Forty field measurements were made within a no-till field mapped as a Harps series soil, a fine-loamy, mixed mesic Typic Calciaquoll. The immobile water contents and immobile water fractions were not significantly different at the head (h) values of -150, -60, and -30 mm. The median immobile water fraction values were 0.40, 0.28, 0.25, and 0.40 for the respective water heads of 10, -30, -60, and -150 mm. The mass exchange coefficient values were positively correlated to h and K. The median mass exchange coefficient values were 0.59, 0.015, 0.0028, and 0.0030/hour for h values of 10, -30, -60, and -150 mm, respectively. Also some correlations were found between macroscopic capillary length and immobile water fraction, which may suggest some break between the macropore and mesopore solute transport domains. The values for immobile water content and mass exchange coefficient were similar to previously reported values.