Abstract
The local community in Pekalongan suffered financial losses as a result of the Kupang River flood. To control floods in the Kupang watershed, this research aims to identify the most effective way to lower the discharge that flows downstream due to heavy rainfall. HEC-HMS modeling was used to analyze flood discharge. The result from an analysis of flood discharge in the existing conditions downstream of the Kupang River with a 100-year returns period is 641.6 m3/s. This study will include 9 locations of the potential reservoir as flood control that will be simulated using small dams and dry dams. The discharge analysis results from modeling a small dam can reduce the discharge by 261.9 m3/s, or 40.8%. On the other hand, the dry dam simulation can reduce flood discharge by 406 m3/s, or 64.8%. According to the analysis's results, using a dry dam to reduce the amount of water that is discharged into the upstream watershed is the most efficient way to manage floods. As a result, the dry dam method is ideal for controlling floods from the Kupang upstream watershed.
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