Analysis of urban flood using synthetic unit hydrograph (SUH) and flood mitigation strategies along way Halim River: a case study on Seroja street, Tanjung Senang District

In the urban area, flooding becomes most common disaster that has not been resolved until today. The utilization of river border area into housing and lack absorption trigger factor flooding, as what is happening around Way Halim River on Seroja street. this floods often happen during rainy season, with latest events recorded January 21 st , 2021. Analysis flood intensities discharges can be parameters for decision-making mitigation strategies. This study aims to analyze along River, street by comparing resulting from three analysis methods Synthetic Unit Hydrograph (SUH) including Gama I SUH, Nakayasu Snyder SUH. Finally, suitable strategies were also proposed in based rain intensities. results showed SUH had highest peak discharge than Based investigation land suitability; rainfall discharges, installing biopore infiltration holes storing water reducing risk area.