Sorong City is located in West Papua Province and is known as one of the most active cities on Papua Island, due to its abundant natural resources. However, the Remu River, which flows through the city, is one of the main causes of annual flooding, resulting in significant social and economic losses. This study aims to design an effective flood control system for the Remu River through river integration, in order to increase its flow capacity to accommodate a larger water discharge. The proposed plan includes the construction of embankments and sheet piles along the riverbanks, as well as the development of reservoirs and dam structures as flood mitigation measures. Hydraulic modelling was carried out using HEC-HMS and HEC-RAS software. In the HEC-RAS modelling, a one-dimensional approach was used to compare the flood water level with the elevation of the riverbanks. The modelling results identify river sections that are prone to overflow and guide the planning of embankments and sheet piles, which are adjusted based on the spatial constraints observed in the field.
