Guájaro reservoir is located in the south east of Atlántico department (Colombia).This water body is the most important in the region since its construction in 1964.It is supplied by an artificial channel (Canal del Dique) by means of a two floodgate system.As a result of excess nutrients and other pollution loads from the drainage basin in recent decades, Guájaro reservoir has suffered eutrophication and other pollution problems, however it still continues to be exploited.For this reason, it is necessary to regulate the hydraulic structures that supply this water body, as they play an important role in managing levels and these in turn for the purpose of water supply and environmental purposes.The present work has been carried out as a sustainability management alternative of the reservoir.The implementation of a two-dimensional hydrodynamic model (EFDC Explorer) and its calibration is implemented using a time series of the free surface levels, and comparing the measured velocities and those estimated by the model for two different climatic periods, to assist the operation of Hydrosystem Canal del Dique-Guajaro.The corresponding comparisons showed a good behaviour between measured and simulated data.Based on the quantitative results of the Nash-Sutcliffe reliability method, it is considered that the results are quite satisfactory to estimate and predict the amount of water flowing in and out of the reservoir through the hydrosystem channel reservoir.