Estimate of runoff from urbanized watersheds within the urban perimeter of the city of Londrina/PR
DOI:
https://doi.org/10.5902/2179460X68261Keywords:
Urbanization, Remote sensing, Surface runoffAbstract
Population growth in urban areas, observed in recent decades, combined with the lack of urban planning and the increase in rainfall intensity has been the reason for frequent flooding in medium and large cities. Thus, this research aims to obtain, by remote sensing, information on the evolution of land use and occupation, from the analysis of satellite images, and implement them, using the SCS Method, to provide flow hydrographs surface of the hydrographic basins inserted in the urban perimeter of the city of Londrina/PR. For this purpose, satellite images of the LANDSAT series were obtained and, soon after, a supervised classification by regions was carried out in order to obtain four distinct soil covers: exposed soil, undergrowth, dense vegetation and urbanized areas. Subsequently, after obtaining the CN values, it was possible to trace the surface runoff hietograms and hydrographs using the Alternate Blocks Method and the SCS Method, respectively. The results obtained showed that all the basins underwent an urbanization process and, consequently, an increase in the average CN and concentration time over the years. The hydrographs showed that the peak flow and the peak time were, respectively, increasing and decreasing over the years.
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