Tenth International Conference on The Constructed Environment

Abstract

Flooding is more noticeable in metropolitan cities and there is an urgent need to assess, analysis, and process the vulnerabilities of metropolitan cities to flooding. The paper presents GIS (Geographic Information System) a tool in assessing, analysis and processing flood vulnerability in metropolitan cities, with a case study of Ibadan metropolis and its environ in Oyo state Nigeria. In assessment of flood vulnerability data types and sources used include topographic map of study area, Shuttle Radar Topographic Mission (SRTM) covering study area, Quickbird imagery of study with a resolution 0.6m and a Geology map of study area. The data types and source were integrated within a GIS software (ArcGISTM) and derived products include Digital elevation model of the study area, Slope map of study area, Drainage map of study area and vulnerability map of study area. The assessment of the flood vulnerability indicated that a large percentage of the studied area is vulnerable to flood and this takes about over 86.67% of the study area, this is due to the presence of high network of infrastructure Over 90% of the study area is located within the floodplain; this singular factor increases the vulnerability of the city to flooding. The findings of this paper can serve as a basis for advising residents in locating basic infrastructure within the high-risk zones