Flood Risk Assessment, Case Studies from Nigeria, is an in- depth research directed towards environmental degradation and exploitation. The goal is to understand the past, the present and the future behaviour of of the whole earth system. On this basis, the interdisciplinary "High impact Flood risk assessment approach" has been applied to this research work. This has resulted in the development of geologic concepts and methods in enviromental scientific work. This work has documented Floor risk assessment;consequences, challenges and solutions in Niger Delta Region, Nigeria.