Bui river is a tributary of the Day river that flows in the territory of Hanoi city and Hoa Binh province. The downstream part of the Bui river, located in the districts of Chuong My and Quoc Oai of Hanoi, is where heavy rains often occur, causing serious impacts on people, especially the floods in 2008, 2017, and 2018. This study used the MIKE hydraulic model, ArcGIS software, and Google Earth to build inundation maps and evaluate effectiveness of flood defense solutions. Options have been proposed to prevent and control flooding and inundation for the Bui river basin and its vicinity, including Restoration of the Tich, Bui and Day rivers
Upgrading and building new reservoirs
Building channels to isolate mountain floods
Upgrading and building new dikes
Upgrading and building new drainage pumping stations, detention basins, and relocation in vulnerable areas. In addition, the study also estimated the number of households to be relocated and the required costs to implement these solutions