Abstract
This study aims to examine the flood propensity of the main watercourse of São Vicente drainage basin and, if relevant, to propose two methodologies to alleviate the impacts, i.e., detention basin sizing and riverbed roughness coefficient adjustment. Geomorphological data were obtained from the watershed characterization process and used through the SIG ArcGIS software for the flood propensity assessment and then for the calculation of the expected peak flow rate for a return period of 100 years through the Gumbel Distribution. Subsequently, the drainage capacity of the river mouth was verified using the Manning-Strickler equation, in order to establish whether the river mouth of the watershed has the capacity to drain the entire volume of rainwater in a severe flood event. In summary, it was possible to conclude that São Vicente’s watershed river mouth is not able to completely drain the rain flow for the established return period. Thus, its drainage capacity was guaranteed by modifying the walls and streambed roughness coefficient and by sizing the detention basin using the Dutch and the Simplified Triangular Hydrograph methods.
Highlights
Global warming with its increasing variability leads to an increased risk of both floods and drought [1]
To evaluate the morphometric features of the main watercourse of São Vicente, an individual analysis of each parameter listed in Table 1 was conducted, correlating them with reference values proposed in various bibliographies
This study revealed how flood-prone São Vicente’s watershed is in the event of extreme rainfall occurrence, as it was already predicted by Directorate for Territorial Management and Environment (DROTA)’s own Flood Risk Report
Summary
Global warming with its increasing variability leads to an increased risk of both floods and drought [1]. While increases in temperatures are in question for all seasons of the year, precipitation may decrease in one season while increasing in the other season. According to some strong findings, this variability in precipitation will increase even more in the future [2]. This, in turn, will lead to a discontinuity of precipitation throughout the year and, to an increase in sudden and torrential rains. Floods, depending on the size of the flow in the surrounding area, affect settlements and agriculture by damaging their areas, lower and upper structures, facilities, and living things, and they interrupt human life and socio-economic activities. Sociological effects on humans from floods, psychological disorders, and the like, are seriously affected
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