ven and Germann, 1982; Bouma, 1990; Hamblin, 1985; Logsdon, 1995; McCoy et al., 1994; Steenhuis et al., Single photon emission computed tomography (SPECT) is an im1990; Singh and Kanwar, 1991; White, 1985). Macropore aging technique that is widely used in medical diagnosis. This technique has never been applied to soils. The objective of this study flow results in rapid movement of water and so...