Abstract
Turrialba City has been frequently affected by flash floods of Colorado River, Gamboa Streamand tributaries. These events are caused by the combination of meteorological conditions, geomorphologicalfactors and the uncontrolled urban expansion along these rivers.A geomorphological description of the study area is provided, mainly on the basis of photo-interpretation andfield observations. Subsequently, a different degree of flood hazard is assigned to each geomorphological unit,depending on their physical characteristics, on the existing urban features and large scale topographic elements,and on the occurrence and behaviour of similar events in the past. In this way it is demonstrated that TurrialbaCity is located in an area with high to medium flood hazard.Finally, the riverbank erosion problem is described. This phenomena is currently becoming more important,specially along the Turrialba River.Comments
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