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The aim of this research is to demonstrate that the movement of the Fonce River, interpreted as erratic in the average values of flow, in the IDEAM hydrological station, located in San Gil, is a perception problem and actually its classification as a Wiener stochastic process, could be a result of the uncertainty margins of the metering devices instead of the erratic nature of the river behavior. At the beginning was collected the average river flow values, then was considered two different cases (with and without uncertainty) and based on that, were established the sample spaces, the events, the sigma algebras, the measurable spaces, the probability spaces, the random variables, and finally the stochastic process itself. This work lets conclude that the apparently erratic movement in the river behavior average flows of the Fonce river could be a result of the high uncertainty levels generated mainly by the mill of the appraisal of the river instead of an own property of the river nature. This will let to establish new stochastic lectures to model the average Fonce river flows dynamic, in which must be precised the mistakes in the metering in a detailed way for each one of the devices used in the measuring, and in each one of the appraisal for the last three decades of monitoring. The work was developed under the research project 1770 ING UMNG 2015, with funding of the Investigation´s office and together with the University of Pamplona.

Identificación de la incertidumbre en el proceso estocástico de caudales medios en el río Fonce (San Gil – Santander)