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Models accurately representing the underlying hydrological processes in the Nile Basin are necessary for implementation of effective soil and water conservation practices. Despite this, most models currently being used in the Nile basin have been developed for temperate climates and might not apply fully to the monsoonal climates with distinct dry periods in the Nile basin. Recently a landscape based hydrology model was developed for the monsoonal climates in the Ethiopian highlands by dividing the watershed in areas that produce runoff and areas in which the all water infiltrates and eventually becomes interflow or base flow. The model was calibrated and validated to predict the discharge of the whole Blue Nile Basin. The objective of this study was to test the validity of the assumptions concerning the runoff processes on a small scale. The study was carried out in the Anjeni Watershed in the Blue Nile Basin for which discharge and rainfall measurements were available for an extended period. Thirty piezometers were installed in four transects and the water table was measured during the rainy season. The performance of the model was evaluated usin