FLOOD VULNERABILITY MAPPING OF RIVER NGADDA USING GEOSPATIAL AND REMOTE SENSING TECHNIQUES MAIDUGURI METROPOLIS, BORNO STATE

Abstract

Flood disaster has been threating to animal, plants, land, human and non-human resources over the years. This have increased concerns on the need to investigate various vulnerable areas to flood for decision making. As a mitigative measures to loss of lives, properties, and livelihood which could arise from flood disaster, understanding zones at risk to flooding is vital to support all stages of disaster management including early warning and planning. River Ngadda is a major river within Maiduguri metropolis. Its plains and banks are known to have different activities and resources. When the river overflows its shores, neighboring lands could suffer destruction, there could be loss of lives and properties. This project aims to investigate flood vulnerability along River Ngadda identifying the shores, plains, and banks of the river at risk. The research adopts ground truth information, the use of Aster DEM (30m) and Sentinel 2 (10m) Satellite Imagery dataset through Geospatial and Remote Sensing techniques to assess undulating nature of the area under study, identify areas liable to flood and analyzed the flood plain. Further analysis was carried out to obtain the Land use and Landcover (LULC) within the study area using a supervised classification and areas at various flood risk were also identified. This research results presented the river plains, flood vulnerable impact on LULC, it was found that 13.17 hectares of built-up areas fall within the very high flood risk zone, over sixty six percent (66%) of the study area appears fall within the moderate to very high vulnerable flood risk zone and the production of the flood plains, LULC, risk and hazard map of the study area was presented. This result could aid early warning, planning and decision making for River Ngadda and its environs.