ABSTRACT
The hydrological model Vflo required the ensemble of various layers that perform the physical and topographic characteristics of the basin area. These layers are formed by parameters that were previously presented as: effective porosity, hydraulic conductivity, wetting front, roughness, soil depth, and initial saturation which can be most sensitive in the watershed. Spatially distributed parameter and input from radar rainfall requires new methods for adjustment in order to minimize differences between simulated and observed hydrographs. The hydraulic roughness, hydraulic conductivity and initial saturation are the most sensitive parameters of the hydrological model. These values are estimated from physical properties of the watershed adjusted to reproduce system behavior. The hydraulic conductivity controls the total amount of water that will be split into the surface runoff. The hydraulic roughness affects the peak flow and the time to peak and initial saturation is related with the existing humidity into the soil.
