The International Conference On Hydrological Data Assimilation And Forecasting (ICHDAF-26) will be held in both physical and virtual modes, ensuring accessibility for participants worldwide. The in-person event will take place in Doha, Qatar while the virtual format will allow attendees to engage from anywhere, making it a truly inclusive conference. This hybrid format enables participants, keynote speakers, presenters, and volunteers to access top-tier resources, discussions, and networking opportunities. The virtual sessions will offer live presentations, interactive panel discussions, and real-time Q&A, while the physical event will provide a space for deeper collaboration, hands-on sessions, and direct interactions with field experts.