Estimación del Coeficiente de Escorrentía “C” y su análisis a través de variables determinantes de la respuesta hidrológica mediante el estudio de tres cuencas urbanas de la ciudad de Cuenca-Ecuador

Abstract

The city of Cuenca faces a permanent process of urbanization, changing the hydrological response of the urbanized area, therefore, it is important to know the hydrological response of its microbasins, where the peak flow (Qp) that is produced is key in the dimensioning of hydraulic structures. Both for the analysis of hydrological response and for estimating Qp the runoff coefficient can be used, being necessary for the first part use the volumetric runoff coefficient (CVOL) and for the second the rate based runoff coefficient (CRATE), however, these values can be obtained using literature values (CTEOR). In this work the runoff coefficient (CVOL and CRATE) were estimated considering the hyetographs and hydrographs registered between March and May 2017. In addition, the coefficient was also analyzed based on the soil cover, permeable soil moisture and rainfall intensities, studying three urban micro-basins of Cuenca. The results showed that for the analyzed rainfall CRATE and CVOL were undervalued by 18% and 21% respectively against the maximum CTEOR. Moreover, it was shown that CVOL’s behavior against permeable soil moisture and impermeable soil cover shows a positive linear correlation, while the correlation with rainfall intensity is not linear. Besides a preliminary expression was found to estimate CVOL based on the soil impermeability of the urban area of Cuenca. In a future work, this relationship must be validated with more information.