*2.1.1 Geographic information*

The geographic information of the basin was obtained in scale 1:50,000 and 1:250,000, which are common scales that manage the official dependencies in Mexico. This information is available in files with .shp extension (*Shapefile*) and in raster format for digital elevation models (DEM), which are located in the Lambert Conformal Conic projection coordinate system (CCL ITRF 1992), which uses the Datum International Terrestrial Reference Framework 1992 (D\_ITRF\_1992). A very complete relational data model was created including the most relevant base geographic and historical information compiled in the rio Bravo/Grande basin.
