Les Bases techniques de la méthode Inondabilité is a technical monograph on the hydrological foundations of the Inondabilité method. It explains how flood characteristics can be studied through relationships among discharge, duration, and frequency, supporting regional and local analysis of flood behavior. The work is intended for engineers, hydrologists, researchers, and practitioners involved in flood estimation, water-resource assessment, and risk management. The book presents methodological principles, technical procedures, and applied concepts relevant to understanding flood regimes and estimating inundation probabilities. Its focus is scientific and practical, connecting hydrological modeling with decision-making for flood-prone areas. Published as a specialist reference in the earth sciences, it contributes to the technical literature on hydrology and flood-risk analysis.