TIME OF CONCENTRATION IN AN EXPERIMENTAL BASIN: METHODS FOR ANALYSIS, BACKWATER EFFECTS AND VEGETATION REMOVAL

  • Simone Malutta Federal University of Santa Catarina
  • Jhonathan Cristian Pscheidt Infrastructure Engineering
  • Tiago Guizoni Neto Infrastructure Engineering
  • Silvana Klein Under graduate on Infrastructure Engineer, Federal University of Santa Catarina,
  • Nádia Bernardi Bonumá Federal University of Santa Catarina
  • Pedro Luiz Borges Chaffe Federal University of Santa Catarina
  • Masato Kobiyama Federal University of Rio Grande do Sul
Keywords: time of concentration, backwater, erosion

Abstract

There are several empirical and theoretical formulas used for the estimation of the time of concentration (Tc). However, it has been shown that the Tc estimation may vary in several orders of magnitude depending on the method. In this study we compare 10 different methods for the estimation of the Tc using sub-basins and backwater effects to analyze those results. We also analyzed if the vegetation removal changes the Tc in the basin. The study area is the basin of the Federal University of Santa Catarina (UFSC) campus in Joinville with a significant part in a wetland and there is backwater effect caused by the Piraí river. Applying the empirical and theoretical equations found a significant variation of Tc estimates, the standard deviation in relation to the general average was around 65%. The influence of vegetation removal and drainage of a canal had an effect of reducing the Tc by 50%.

Author Biographies

Nádia Bernardi Bonumá, Federal University of Santa Catarina
Professor Department of Sanitary and Environmental Engineering
Pedro Luiz Borges Chaffe, Federal University of Santa Catarina
Professor Department of Sanitary and Environmental Engineering
Masato Kobiyama, Federal University of Rio Grande do Sul
Institute of Hydraulic Research
Published
2019-10-05
Section
Articles