Urban flood vulnerability mapping of part of the Lagos metropolis

• Main Authors: O. Adeaga, O. T. Oyeneye, O. Akinbaloye
• Format: Article
• Language: English
• Published: Copernicus Publications 2020-09-01
• Series: Proceedings of the International Association of Hydrological Sciences
• Online Access: https://piahs.copernicus.org/articles/383/249/2020/piahs-383-249-2020.pdf

<p>Flooding is the most common of all environmental hazards with vast devastating effect due to enormous losses to lives and properties world-wide, annually. Thus, the effect of extreme flooding is dramatic, not only at the individual household level, but in the country as a whole. This study focuses on flood risk assessment based on urban and coastal flood estimation due to the physical peculiarity of the Lagos region and her urbanization characteristics. It involves creating a flood change detection using GIS approach with the aid of a Cellular Automation Framework to simulate flooding in Lagos Metropolitan area, mapping out the flood prone areas and generating a flood vulnerability map for flood management and planning purposes. At twenty minutes intervals the discharge distribution for the different flow regimes (Low, Medium and Extreme) display flow duration between 60–120&thinsp;min while the time of concentration is attained at 1&thinsp;h 20&thinsp;min (80&thinsp;min).</p>