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<p>To ensure the durability and stability of earth dams, it is crucial to control seepage through their both body and foundation. This study evaluated the influence of different cutoff walls and horizontal drains parameters on seepage flow in the Krerish dam located in Algeria. Using SEEP/W software for numerical simulation, we analyzed the depths and positions of cutoff walls, as well as the horizontal drain lengths on seepage characteristics. The results indicate that increasing the cutoff wall depth (d) from 0.5H to 1.0H decreased discharge seepage by 35% and lowered outlet gradient by 28%. Placing the cutoff wall centrally within the dam was more effective than downstream placement, decreasing the uplift pressure by 22%. Extending the horizontal drain length (L) from 0.1X to 0.3X resulted in a 40% reduction in uplift pressure and 15% reduction in discharge seepage. The optimum configuration combined a central position of cutoff wall at a depth of 1.0H with a horizontal drain length of 0.3X, achieved a 45% reduction in discharge seepage, a 38% reduction in outlet gradient and a 50% decrease in uplift pressure. These results provide valuable insights for optimizing seepage control in earth dams, contributing to their safety and stability.</p>

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Optimizing seepage control in earth dams: a case study of Krerish dam with combined countermeasures

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Hicham Charrak,
  • Hamza Loualbia,
  • Youcef Kismoune

摘要

To ensure the durability and stability of earth dams, it is crucial to control seepage through their both body and foundation. This study evaluated the influence of different cutoff walls and horizontal drains parameters on seepage flow in the Krerish dam located in Algeria. Using SEEP/W software for numerical simulation, we analyzed the depths and positions of cutoff walls, as well as the horizontal drain lengths on seepage characteristics. The results indicate that increasing the cutoff wall depth (d) from 0.5H to 1.0H decreased discharge seepage by 35% and lowered outlet gradient by 28%. Placing the cutoff wall centrally within the dam was more effective than downstream placement, decreasing the uplift pressure by 22%. Extending the horizontal drain length (L) from 0.1X to 0.3X resulted in a 40% reduction in uplift pressure and 15% reduction in discharge seepage. The optimum configuration combined a central position of cutoff wall at a depth of 1.0H with a horizontal drain length of 0.3X, achieved a 45% reduction in discharge seepage, a 38% reduction in outlet gradient and a 50% decrease in uplift pressure. These results provide valuable insights for optimizing seepage control in earth dams, contributing to their safety and stability.