In Mexico City, due to the excessive growth of the population, with more buildings, houses, other constructions and paving of streets, little permeable surfaces have been generated, increasing the volume of runoff that often causes flooding. Part of this problem was observed in the Tarango microbasin, where the Río Puerta Grande stream is located, with a length of 6.3 km, where there are some 53 discharges of urban wastewater that are discharged directly into the stream, which produces contamination, affecting its quality. It belongs to an Area of Environmental Value due to its ecological importance, so it is important to know its rainfall flow in order to have hydraulic and hydrological data, in order to establish a future water treatment design. Objective for which the calculation of the flow of pluvial origin of runoff in the micro-basin was carried out, with a return period of 25 years, in addition to also considering residual discharges, for which a flow of 49.10 m 3 /s was obtained, performing gauging to obtain the configuration of the channel, its speed and depth, in order to identify its behavior in dry season and after rains, comparing field data with the time adjustment curve (hydrograph).