The compartmental analysis was used for evaluation of kinetic parameters of the rainfall infiltration and determination of ground water recharge in Abadia de Goias - Goiania - Brazil. A model containing 13 compartments was proposed to explain the water infiltration and the kinetics of the unsaturaded zone. To validate the model, tracer injections were carried out at a representative site of the region, at a depth of 50 cm, below the root zone. Soil samples were taken 4, 9 and 12 months after the injection. In the first compartment, one component of evaporation (k_4,0) was considered and for the last compartment, one constant of removal for the water table (k_13,0). Compartments 1, 2 and 3 were added to the system to consider precipitation effect. The AnaComp program, developed at IPEN, was used to determine the transfer constans k_i,j (from compartment i to compartment j) where i and j range from 0 to 13. In this program the constants k_i,j were determined by the nonlinear least squares method, using eigenvalues - eingenvectors routines or alternatively, the fourth order Runge-Kutta routine. In this compartment model, the radioactive tracer was introduced as a single pulse, into the 6th compartment (50 cm deep). This permits to characterize the tracer diffusion processes in the soil studied. The adopted model showed an explanation coefficient r² equal to 0.78, which is satisfactory for the methodology used.