अगली बाढ़ से आर वैली को बचने के लिए तैयारी [How to flood-proof an entire river]

Five years ago, the Ahr Valley in Germany was swept away by a massive flood. While rebuilding their homes, residents are already preparing for the next one. How do they do it? Five years ago, the Ahr valley in Germany was literally swept away by a massive flood. While building back, the locals are already preparing for the next one. How do they do it?