Flood Mitigation in East Coast Semarang City: Hydrological and Hydraulic Analysis for Polder System Optimization

Authors

  • Ikhwanudin Univesrsitas Persatuan Guru Republik Indonesia Semarang
  • Imadudin Harjanto Univesrsitas Persatuan Guru Republik Indonesia Semarang
  • Risdiana Cholifatul Afifah Univesrsitas Persatuan Guru Republik Indonesia Semarang
  • Farida Yudaningrum Univesrsitas Persatuan Guru Republik Indonesia Semarang

DOI:

https://doi.org/10.26877/asset.v8i1.2764

Keywords:

Bankfull Capacity, Flood mitigation, HEC-RAS simulation, Nakayasu, Sringin Watershed

Abstract

Flooding is a recurring hazard across Indonesia, particularly in urban regions such as Semarang City, where high-intensity rainfall, tidal surges, land subsidence, and changes in land use contribute to frequent inundation. This study investigates the effectiveness of the Sringin Polder system in mitigating flood risks through an integrated hydrological and hydraulic analysis. The hydrological component involved calculating design rainfall values for various return periods, with a peak intensity of 113 mm recorded for the 10-year event. These values were used to simulate flood discharges using HEC-RAS.For the 25-year return period, the main river channel produced a simulated flood discharge of 47.42 m³/s, resulting in water overtopping the left embankment by 0.545 m at station P.30.  calculated flood flow and the existing capacity of the river cross-sections.

Author Biographies

  • Ikhwanudin, Univesrsitas Persatuan Guru Republik Indonesia Semarang

    Department of Civil Engineering, Universitas Persatuan Guru Republik Indonesia Semarang, Jl. Dr Sidodadi Timur 24, Semarang, Central Java 50125, Indonesia

  • Imadudin Harjanto, Univesrsitas Persatuan Guru Republik Indonesia Semarang

    Department of Mechanical Engineering, Universitas Persatuan Guru Republik Indonesia Semarang, Jl. Dr Sidodadi Timur 24, Semarang, Central Java 50125, Indonesia

  • Risdiana Cholifatul Afifah, Univesrsitas Persatuan Guru Republik Indonesia Semarang

    Department of Civil Engineering, Universitas Persatuan Guru Republik Indonesia Semarang, Jl. Dr Sidodadi Timur 24, Semarang, Central Java 50125, Indonesia

  • Farida Yudaningrum, Univesrsitas Persatuan Guru Republik Indonesia Semarang

    Department of Civil Engineering, Universitas Persatuan Guru Republik Indonesia Semarang, Jl. Dr Sidodadi Timur 24, Semarang, Central Java 50125, Indonesia

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Published

2026-01-13

Issue

Vol. 8 No. 1 (2026): November - January

Section

Articles