Flood hazard assessment of Atrato River in Colombia |
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Authors: | S Mosquera-Machado Sajjad Ahmad |
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Affiliation: | (1) International Research Institute for Climate and Society The Earth Institute, Columbia University 61 Rt. 9W, Monell Building, Palisades, NY 10964-8000, USA;(2) Department of Civil, and Environmental Engineering, University of Nevada, Las Vegas, NV 89154-4015, USA |
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Abstract: | The flood hazard caused by Atrato River in Quibdó, northwest of Colombia is assessed using statistical modeling techniques
(Gumbel and GRADEX), hydraulic modeling with HEC-RAS and the Geographic Information Systems (GIS). Three flood hazard maps
for return periods of 10, 20 and 50 years are generated. The flood hazard modeling reveals that the flooded zone is more significant
out of the left (West) bank than out of the right (East) bank of Atrato River. For the three return periods the maximum depth
of water reached by the river and extent of flooding are estimated. Sensitivity analysis on roughness coefficient and peak
discharge is performed. For 50 year return period (Q =3054 m3/s), water depth on the left and right bank of Atrato River is 3.7 m and 3.1 m, respectively. This information is useful in
defining the minimum height of flood protection structures such as dikes to protect the area from flooding. The results can
be useful for evacuation planning, estimation of damages and post flood recovery efforts. |
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Keywords: | Flood modeling GIS Gumbel GRADEX Flood hazard Flood map Atrato River Quibdó Colombia |
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