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Water Resour Manage (2007) 21:591609 DOI 10.1007/s11269-006-9032-4

Summary: Water Resour Manage (2007) 21:591­609
DOI 10.1007/s11269-006-9032-4
Flood hazard assessment of Atrato River in Colombia
S. Mosquera-Machado · Sajjad Ahmad
Received: 11 July 2005 / Accepted: 8 May 2006
C Springer Science + Business Media B.V. 2006
Abstract The flood hazard caused by Atrato River in QuibdŽo, 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.


Source: Ahmad, Sajjad - Department of Civil and Environmental Engineering, University of Nevada at Las Vegas


Collections: Engineering