Delineation of built-up areas liable to flood in Yola, Adamawa State, Nigeria using remote sensing and geographic information system technologies

Abstract

This study used the techniques of Remote Sensing and Geographic Information System (GIS) to identify the built up areas within Jimeta/Yola town that are liable to flood. Ikonos image and a topographic map covering the study area were used. Built up area was extracted from the image while an elevation model was created from the topographical map. The built up area was overlaid on the elevation model. Those within the flood plain are liable to flood while those outside the floodplain are not liable to flood. The result shows that Jambutu area in Jimeta has the highest risk of flooding; the flooded area covers 12.296 hectares. In Yola, most portion of Damare area is a flood vulnerable area. It covers an area of 1.759 hectares. The total area likely to get flooded in Jimeta/Yola town is 15.636 hectares.

Keywords: Built-up area, Flood, Floodplain, Georeference, River Benue, Yola Jimeta