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The Bodri Dam is a significantinfrastructure project that has feasibly planned on the Bodri River in Kendal Regency, Indonesia, with the primary purpose of supporting water supply for irrigation and controlling water flow to mitigate flood risks in the region. As the alternative-2 plan result, it is featured with a diversion tunnel as a critical component to manage water flow during construction and peak flood events. Despite its importance, a detailed design for the tunnel’s geometry has yet to be developed. This study provides recommendations for the geometry, excavation method, and support system of the diversion tunnel for the Preliminary Design Alternative-2 of the Bodri Dam in Kendal, Central Java. The tunnel’s inlet and outlet are set at elevations of +114 meters and + 113 meters above sea level, respectively, with a horseshoe cross-section. The diameter is determined from hydraulic analysis, based on a 25-year return period flood flow (Q25) = 602,28 m3/s, and excavation method and support system are selected using then empirical methods Rock Mass Rating (RMR) and Geological Strength Index (GSI).

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Recommendation of Geometry, Excavation Method and Support System for Diversion Tunnel of Preliminary Design Alternative-2 Bodri Dam in Kendal, Central Java

  • 会议论文

  • 发表日期：

    2026年

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  • Quentino Elgar Pramarsantya,
  • I. Gde Budi Indrawan,
  • Esti Handini,
  • Yogi Pandhu Satriyawan

摘要

The Bodri Dam is a significantinfrastructure project that has feasibly planned on the Bodri River in Kendal Regency, Indonesia, with the primary purpose of supporting water supply for irrigation and controlling water flow to mitigate flood risks in the region. As the alternative-2 plan result, it is featured with a diversion tunnel as a critical component to manage water flow during construction and peak flood events. Despite its importance, a detailed design for the tunnel’s geometry has yet to be developed. This study provides recommendations for the geometry, excavation method, and support system of the diversion tunnel for the Preliminary Design Alternative-2 of the Bodri Dam in Kendal, Central Java. The tunnel’s inlet and outlet are set at elevations of +114 meters and + 113 meters above sea level, respectively, with a horseshoe cross-section. The diameter is determined from hydraulic analysis, based on a 25-year return period flood flow (Q25) = 602,28 m3/s, and excavation method and support system are selected using then empirical methods Rock Mass Rating (RMR) and Geological Strength Index (GSI).