TTE232

Abstract The Queule river in the commune of Toltén, province of Cautín, has been the scene of recurring floods in the face of events of maximum avenues, generating material and economic damage; Therefore, the delimitation of zones vulnerable to flooding through hydrological and hydraulic modeling is the purpose of this investigation, in order to mitigate the damage. This approach is non-experimental and was developed with a sample of a 9 km section of the Queule River from Balsa Los Pinos to Caleta Queule. The data procedure was given through statistical methods -ArcGIS 10.8, HEC-HMS 4.10, HEC-RAS 6.1, Hydrognomon y Microsoft Excel 2021. The hydrological model was developed through HEC-HMS with input data: geomorphological parameters of the sub-basin, initial abstractions (Ia), number curve (CN) and design rainfall hyetograms in 24 hours; resulting in maximum flows of 73,7, 120,4, 150,8, 189,5, 218,2, 246,8 and 312,8 m3/s for return periods of 5, 10, 25, 50, 100, and 500 years respectively, the same ones that were calibrated. Next, the hydraulic model of the flows was made using HEC-RAS, with input data: topography, Manning coefficient (n) and maximum flows. Finally, the areas vulnerable to flooding for the selected return periods were determined, which are: Portal Queule, Caleta Queule and Los Pinos.

Keywords: HEC-RAS, Floods, Máximum Avenues, Hydrological Model, Hydraulic Model, Vulnerability

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