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Embankment Dam Seepage and Slope Stability Analysis: The Case of Arjo-dedessa Dam, Ethiopia

Received: 25 June 2021     Accepted: 10 July 2021     Published: 2 August 2021
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Abstract

Dams have one of the greatest significant roles in operating water resources. Seepage and slope stability failures cause completely failure of embankment dams. Dam disasters not only hazard community safety, they also can cost our economy millions of dollars in compensations. The study area is found in Oromia regional state between East Wollega and Bunno Bedele Zone. The dam is located on Dedessa River, tributary of Blue Nile River. Analysis of seepage quantity was done by Darcy’s phreatic line, and SEEP/W software model for both homogeneous and zoned dam. The expected quantity of seepage estimated with the SEEP/W software model analysis that includes foundation seepage is 6.6*10-6m3/sec. Slope stability study is to contribute to the safe and economic design of upstream and downstream slope of the dam. The factory of safety obtained by Morgenstern-Price method for end construction is (FOS=1.99), for steady state (FOS=2.03) and rapid drawdown (FOS=2.91). However, at the design document shell material hadn’t been designed properly. Finally the paper concluded that the likely corrective measures for seepage controls are impermeable blanket, grouting, and the downstream slope miscarriage by eliminating the pathetic zone and seal with like graded quantifiable, regular repairs and shield the downstream slope with grasses.

Published in Journal of Civil, Construction and Environmental Engineering (Volume 6, Issue 4)
DOI 10.11648/j.jccee.20210604.11
Page(s) 104-109
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2021. Published by Science Publishing Group

Keywords

Limit Equilibrium Methods, Phreatic Line, Seep/w, Slop/w, Steady State

References
[1] Aryal, K. P. (2006). Slope stability evaluations by limit equilibrium and finite element methods.
[2] Athani, S. S., Solanki, C. H. and Dodagoudar, G. R. (2015). Seepage and stability analyses of earth dam using finite element method. Aquatic Procedia, 4, pp. 876-883.
[3] Hordofa, K. (2015). Gefersa II embankment dam hydraulic failure, addis ababa.
[4] Garg, S. K. (2005). Irrigation engineering and hydraulic structures. Delhi. ninteenth edition.
[5] GEO-SLOPE International. Ltd. (2018). stability modelling with Geostudio. Canada.
[6] OWWDSE.( 2017). Arjo- dhidhessa design report.
[7] Redda, H. (2016). Evaluation of embankment dam failure and remedial measureAddis Ababa.
[8] Rajeeth, A. (2011). Failure of an Earth Dam. Oslo.
[9] Omofunmi, O. E., Kolo, J. G., Oladipo, A. S., Diabana, P. D. and Ojo, A. S. (2017). A review on effects and control of seepage through earth-fill dam.
[10] Saluja, I. S., Athar, M. and Ansari, S. A.(2018). Causes of Failure of Earthen Dams and suggested Remedial Measures.
[11] Tadesse, D. (2017). High embankment dam alternative design and analysis, Addis Ababa.
[12] Tumoro, M. (2010). Characterization and Suitability Analysis of Embankment Material. Addis ababa.
[13] Umaru A. B. (2014). Sangodoyin A. Y2 and Oke I. A On the Causes and Effects of Earth Dams Failures in North-Eastern Nigeria. International Journal of Engineering Research & Technology. Vol. 3. - pp. 2278-0181.
[14] Yazdanian, M., Afshoon, H. R., Ghasemi, S., Afshoon, V. and Fahim, F. (2017). Effect of height on the static stability of heterogeneous embankment dams. Selçuk Üniversitesi. 5 (3), pp. 274-282.
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  • APA Style

    Ayansa Gamachu Aga. (2021). Embankment Dam Seepage and Slope Stability Analysis: The Case of Arjo-dedessa Dam, Ethiopia. Journal of Civil, Construction and Environmental Engineering, 6(4), 104-109. https://doi.org/10.11648/j.jccee.20210604.11

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    ACS Style

    Ayansa Gamachu Aga. Embankment Dam Seepage and Slope Stability Analysis: The Case of Arjo-dedessa Dam, Ethiopia. J. Civ. Constr. Environ. Eng. 2021, 6(4), 104-109. doi: 10.11648/j.jccee.20210604.11

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    AMA Style

    Ayansa Gamachu Aga. Embankment Dam Seepage and Slope Stability Analysis: The Case of Arjo-dedessa Dam, Ethiopia. J Civ Constr Environ Eng. 2021;6(4):104-109. doi: 10.11648/j.jccee.20210604.11

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  • @article{10.11648/j.jccee.20210604.11,
      author = {Ayansa Gamachu Aga},
      title = {Embankment Dam Seepage and Slope Stability Analysis: The Case of Arjo-dedessa Dam, Ethiopia},
      journal = {Journal of Civil, Construction and Environmental Engineering},
      volume = {6},
      number = {4},
      pages = {104-109},
      doi = {10.11648/j.jccee.20210604.11},
      url = {https://doi.org/10.11648/j.jccee.20210604.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jccee.20210604.11},
      abstract = {Dams have one of the greatest significant roles in operating water resources. Seepage and slope stability failures cause completely failure of embankment dams. Dam disasters not only hazard community safety, they also can cost our economy millions of dollars in compensations. The study area is found in Oromia regional state between East Wollega and Bunno Bedele Zone. The dam is located on Dedessa River, tributary of Blue Nile River. Analysis of seepage quantity was done by Darcy’s phreatic line, and SEEP/W software model for both homogeneous and zoned dam. The expected quantity of seepage estimated with the SEEP/W software model analysis that includes foundation seepage is 6.6*10-6m3/sec. Slope stability study is to contribute to the safe and economic design of upstream and downstream slope of the dam. The factory of safety obtained by Morgenstern-Price method for end construction is (FOS=1.99), for steady state (FOS=2.03) and rapid drawdown (FOS=2.91). However, at the design document shell material hadn’t been designed properly. Finally the paper concluded that the likely corrective measures for seepage controls are impermeable blanket, grouting, and the downstream slope miscarriage by eliminating the pathetic zone and seal with like graded quantifiable, regular repairs and shield the downstream slope with grasses.},
     year = {2021}
    }
    

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  • TY  - JOUR
    T1  - Embankment Dam Seepage and Slope Stability Analysis: The Case of Arjo-dedessa Dam, Ethiopia
    AU  - Ayansa Gamachu Aga
    Y1  - 2021/08/02
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    N1  - https://doi.org/10.11648/j.jccee.20210604.11
    DO  - 10.11648/j.jccee.20210604.11
    T2  - Journal of Civil, Construction and Environmental Engineering
    JF  - Journal of Civil, Construction and Environmental Engineering
    JO  - Journal of Civil, Construction and Environmental Engineering
    SP  - 104
    EP  - 109
    PB  - Science Publishing Group
    SN  - 2637-3890
    UR  - https://doi.org/10.11648/j.jccee.20210604.11
    AB  - Dams have one of the greatest significant roles in operating water resources. Seepage and slope stability failures cause completely failure of embankment dams. Dam disasters not only hazard community safety, they also can cost our economy millions of dollars in compensations. The study area is found in Oromia regional state between East Wollega and Bunno Bedele Zone. The dam is located on Dedessa River, tributary of Blue Nile River. Analysis of seepage quantity was done by Darcy’s phreatic line, and SEEP/W software model for both homogeneous and zoned dam. The expected quantity of seepage estimated with the SEEP/W software model analysis that includes foundation seepage is 6.6*10-6m3/sec. Slope stability study is to contribute to the safe and economic design of upstream and downstream slope of the dam. The factory of safety obtained by Morgenstern-Price method for end construction is (FOS=1.99), for steady state (FOS=2.03) and rapid drawdown (FOS=2.91). However, at the design document shell material hadn’t been designed properly. Finally the paper concluded that the likely corrective measures for seepage controls are impermeable blanket, grouting, and the downstream slope miscarriage by eliminating the pathetic zone and seal with like graded quantifiable, regular repairs and shield the downstream slope with grasses.
    VL  - 6
    IS  - 4
    ER  - 

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Author Information
  • Civil Engineering Department, College of Engineering, Mettu University, Mettu, Ethiopia

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