The main core of this paper is the computation of the hydrological balance for the karstic aquifer of the sedimentary Duero watershed, middle-west of Spain. The obtained results for the hydrological balance have been used in the construction of simulated scenarios. In order to characterize the spatial and temporal dynamics of the water resources evolve through the hydrological year geostatistical (SpaceStat software) and numerical methodologies (Visual Modflow, software) were carried out. The Montes Torozos is a sedimentary karst unconfined aquifer, and its hydrological balance is defined by rainfall and drains.