FLOOD VULNERABILITY MAPPING OF RIVER NGADDA USING GEOSPATIAL AND REMOTE SENSING TECHNIQUES MAIDUGURI

Over the years, flood disasters have posed a threat to animal, plant, land, human, and non-human resources. This has raised worries about the necessity to explore various flood-prone locations before making decisions. Understanding flood-prone zones is critical to supporting all stages of disaster management, including early warning and planning, as a preventative strategy against the loss of lives, property, and livelihood that might result from a flood catastrophe. Within the Maiduguri city, the River Ngadda is a prominent river. Its plains and rivers are notable for a variety of activities and resources. When the river overflows its banks, it may destroy nearby lands, resulting in the loss of life and property. The goal of this study is to look at flood susceptibility along the Ngadda River by identifying the beaches, plains, and wetlands. The riverbanks are in danger. Ground truth data, as well as the usage of Aster DEM (30m) and Sentinel 2 (10m) Satellite Imagery datasets, are used in this work to assess the undulating nature of the region under investigation, identify flood-prone locations, and examine the flood plain. A supervised classification was used to determine the Land Use and Landcover (LULC) within the research region, and locations of varied flood risk were also identified. The river plains, flood susceptible influence on LULC was provided in this study. It was discovered that 13.17 hectares of built-up areas fall within the very high flood risk zone, and that over sixty-six percent (66%) of the study area seems to fall within the moderate to very high flood risk zone. The research area's high sensitive flood risk zone and the development of flood plains, LULC, risk, and hazard maps were given. This finding might help River Ngadda and its surrounds with early warning, planning, and decision-making.

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