The 9th International Symposium on Flash Floods in Wadi Systems (ISFF9) is organized by the Water Research Center, Sultan Qaboos University (SQU) on December 2-3, 2025. The two-day symposium will take place in Muscat, Oman, at the campus of the SQU. This version will convene on the theme "Flash Floods and Dam Management: Towards Effective Management of Floods and Water Sustainability". Continuing to share knowledge, experiences and lessons learned by all participants, ISFF9 organizers welcome presentations from all relevant fields.