Estudio de la influencia de la densidad espacial y cobertura superficial en la escorrentía en zonas urbanas

Abstract

The change of land use and particularly urbanization is considered as one of the aspects that favour the floods due to waterproofing that this entails. The curve number method is most often used to characterize the conditions of infiltration that correspond to land use. The present study aims to determine the influence of the level of detail in the determination of the number of the curve in the calculation of the effective precipitation in 6 zones in the city of Cuenca. The influence of the change of land use in surface runoff based on different scenarios is studied. We founded that there is an inverse relationship between the percentage difference between the calculated effective precipitation with the number of the curve with different level of detail, and the duration of the storm, as well as an inverse relationship between the period of return and the percentage difference. It was found that increases of 40% of impervious areas produce an increase in surface runoff in the order of 65% for storms 10 minutes duration.