Package modeling for the hydrometeorological estimation of floods. The model, developed by the Hydrologic Engineering Center Corps of Engineers of the U.S. Navy arises as an evolution of the HEC-1, with several improvements over it, among which the graphical user interface stands out since it simplifies the job of pre and post-processing and provides the possibility of using HEC GEOHMS to connect to the ArcGIS geographic information system. The application includes a rainfall - runoff model for flood estimation.