According to the NMX-AA-159-SCFI-2012, the definition of ecological flow is the quantity, quality and variation of the expense or levels of water reserved to preserve environmental services, components, functions, processes and the resilience of aquatic ecosystems. and terrestrial that depend on hydrological, geomorphological, ecological and social processes. The ecological flow reconciles the economic, social and environmental demand of water, recognizes that the goods and services of the hydrological basins depend on physical, biological and social processes, and that only by conserving the water they need, their future provision can be guaranteed. This Mexican norm establishes the procedure and technical specifications to determine the regime of ecological flow in streams or national bodies of water in a hydrological basin and applies to all those who carry out studies to request allocations, build infrastructure and make transfers between basins.