Flood hazard has become the most frequent natural disaster and has provoked global responsiveness. Due to its devastating nature, many lives have been lost, natural ecology degraded, disrupted social and economic activities and destroyed properties worth billions of dollars. Such overwhelming effect is felt more in urban centers especially those located in coastal regions. Estimating flood risk was a complex multi-faceted problem due to the level and amount of knowledge in systematic disciplines such as geography, geomorphology, climatology, hydrology, hydraulic engineering and urban planning that need to be combined. Presently, this problem has been surmount with the introduction of geographic information system (GIS) which when properly integrated with remote sensing technique, has the capability to transform the manner and way of modeling flood risk and extracting spatial information to support decision making processes.