Abstract

This research proposed the implementation of a polder system to protect the Bendung sub-catchment of Palembang City from inundation and flooding. The system consists of several key components, including ring dikes, outlet structures, and storage areas such as drainage canals and retention basins. The results indicate that the polder system is a viable option for flood protection in the Bendung sub-catchment, utilizing outlet structures, ring dikes, and temporary storage facilities. The existing pumping system, with a total capacity of 18 m³/s, was found to be sufficient for controlling water levels in the lower part of the polder when operated systematically. The duFlow program was used for the analysis, modeling both steady and unsteady flow, as well as water quality processes in one-dimensional open channel systems. Hydraulic response analysis revealed that only three pump units, each with a capacity of 9 m³/s, were needed to effectively regulate the water level in the lower area. However, to address water level management in the upper part and account for land use within the river plain, constructing a dike system along the river is recommended over river normalization. Expanding river profiles, particularly in areas already densely occupied by residential structures, was deemed infeasible.

Keywords

Urban flood control, Polder system, Bendung sub-catchment, Hydrodynamic modelling, Flood mitigation, duFlow simulation.

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