The generation of a Digital Elevation Model (DEM) using LiDAR technology is a key tool in hydraulic modelling for water resource management. The main objective of this research was to compare the effect of combinations of flight pathways and filtering techniques on the generation of a DEM and the response of a hydraulic model in a section of the stream Granada in the municipality of Galapa (Atlántico). For this purpose, a DEM was generated in an area located in the basin of the Granada stream with dense vegetation applying different filtering techniques to LiDAR surveys with different flight patterns. The DEM sections generated for each combination of flight form and filtering techniques using error metrics were then evaluated. Finally, we evaluated the response of hydraulic modelling in HEC-RAS for different precipitation events based on the information obtained from IDEAM. The results suggest that the unification of flight techniques, carried by nearby filtering techniques, produced more consistent DEM