Flood Modeling Using Hec-Ras Software Due to The Overflow of the Bengawan Solo River in Bojonegoro Regency

Mohamad Ferdaus Noor Aulady; Nur Kartika Sari

doi:10.24036/sjdgge.v9i2.649

Authors

Mohamad Ferdaus Noor Aulady Civil Engineering Study Program – Institute Technology Adhi Tama Surabaya
Nur Kartika Sari Civil Engineering Study Program – Institute Technology Adhi Tama Surabaya

DOI:

https://doi.org/10.24036/sjdgge.v9i2.649

Keywords:

Flood, Bengawan Solo, Hydrologic Engineering Center (HEC-RAS), Nakayasu Synthetic Unit Hydrograph (HSS, Normalization

Abstract

The Bengawan Solo River covers an area of approximately 16,100 km² and has a length of about 660 km. Increasing and irregular rainfall patterns have led to rising water levels in the Bengawan Solo River. Therefore, by utilizing technological advancements, floodplain modeling techniques can be applied using the HEC-RAS software as a flood disaster mitigation effort. The research method used involves calculating the flood discharge using the Synthetic Unit Hydrograph (HSS) Nakayasu method, followed by hydraulic analysis with the HEC-RAS software. The resulting flood discharge for the Q₁₀₀ year return period is 11,570.98 m³/s. Based on the Q₁₀₀ discharge value, the existing river cross-section is unable to accommodate the flow. From this analysis, the selected mitigation method is a structural approach in the form of river normalization.

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