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society. The intense growth of the cities in the past few decades, along with the irregular occupation of urban space with precarious settlements close to the rivers, were determining factors for these catastrophic situations to occur. The objective of this study is mapping and identifying the flooding areas in September 2011 in the city of Itajaí for the confection of a risk map. For this a historical analysis of the growth of the Itajaí urban area was realized, correlating with the flood spots. The obtained results reveal that the 2011 floods affected a significant portion of the city’s area, especially the urban perimeter. The most critical flood spots were in the areas where urban growth took place, especially nearby the ItajaíMirim river. By analizing the map, it’s noted that a big part of the city of Itajaí is classified as a high flood risk area. It can be concluded that the mapping of risk areas is an important tool and instrument in the control and prevention of floods in the areas affected by this phenomenon.

Identification and mapping of the flood risk areas in the city of Itajaí-SC based on the 2011 floods