Estudio para determinar la variación del coeficiente de escorrentía y su impacto en los colectores de la calle Larga y calle Miguel Vélez de la ciudad de Cuenca

Abstract

The increase of paved areas is one of the greatest problems that affects cities’ drainage systems. Its study and solution shows the need of alternatives, such as sustainable urban drainage, which lets runoff be controlled in its origin place, but also determines the necessary guidelines for conserving and managing new technologies oriented for the community. Generally, collectors’ hydraulic capacity is prone to saturate especially in zones where soil sealing has incremented the runoff coefficient value. In this document, the parameter variation in rainwater sub basins from central Cuenca is determined, an thus, collectors’ capacity from CalleLarga and Miguel Veléz can be evaluated with the Rational Method. Finally, the runoff coefficient calculation is generally done by established tables from technical literature which assign a value range depending on the zone or surface types to which each value belongs; the selection of these coefficients, without considering hydrologic soil characteristics, leads to runoff flow overestimates, and hence, to oversizing hydraulic control structures. In order to introduce this factor into the superficial runoff calculation, a comparative study through Curve Number’s Method with appropriate technical support is proposed to define the parameters required.