10.18453/rosdok_id00004833 Tran, Ngoc Huan Ngoc Huan Tran http://d-nb.info/gnd/1281279455 https://orcid.org/0000-0003-3891-8215 Universität Rostock, Fakultät für Agrar, Bau und Umwelt, Professur Hydrologie und Angewandte Meteorologie 2025 550 Earth sciences 624 Structural and Environmental Engineering 630 Agriculture 2025 en https://purl.uni-rostock.de/rosdok/id00004833 urn:nbn:de:gbv:28-rosdok_id00004833-5 Flooding is the most common natural disaster, heavily affecting humans, economies, and environment. However, flood-related information and flood damage have not been recorded and estimated due to limited resources. This study proposes a new method using citizen science to collect flood data. It also combines citizen science, remote sensing, fieldwork, and literature to create flood hazard maps and assess agricultural flood damage in Vietnam’s Bui River Basin. This study presents innovative approaches to closing the flood-related data gap and improving flood risk assessment in data-poor areas.