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    • Garung Dam, A Life of 650 Years

    By on September 1, 2012

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    Built on a natural water reserve, this dam is exquisite with its uniqueness. Its design is adapting an ancient crater, composed of adhesive lava, lapilli’s tuff, volcanic breccias and talus deposit together with artesian water formed Menjer Lake (a caldera). The permeability coefficient is 10-2 to 10-5 cm/sec.The water that flows into the lake is increased from diverting Klakah and Serayu Rivers, through a free tunnel (2,160m long) in a horseshoe section, which sedimentation control function.

    The water which flows to the lake is almost free of any sedimentation will prolong the lake life time up to 650 years. The dam functioned since 1982, built using concrete gravity construction. The dam on Menjer lake is called Garung Dam. This dam scheme is completed with irrigation supply system, after bay weir, and power generation facility (26.4MW), which characterized by an open steel penstock (2,300m long and 2.60m in diameter), without a surge tank. The success of this dam is one of the best practices in Indonesia. Through this study, authors would like to point out the effectiveness of the system to be adapted for similar scheme on other dams with high sedimentation problems to prolong their life time.

    It is a special dam designed for its hydropower function, which in the development also has irrigation and domestic water uses. Fortunate for its system and scheme, Garung Dam is on the other hand unfortunate for its surrounding natural condition, due to high level of  deforestation in its upper stream. The design implemented in this scheme can be adapted to other dams with high sedimentation problems to reduce sediments’ level, and therefore prolong the life span of the dam. Here, in this example, technical solutions have enhanced natural condition and add values to Menjer Lake functions.

     This abstract was already presented in Kyoto Intl Conference Building, ICOLD Kyoto 2012, Japan

    Vicky Ariyanti

    Mrs. Ariyanti holds Master of Science degree in urban planning from Bauhauss Uni, Weimar, Germany and Master of Engineer from Tongji Uni, Shanghai, China. She works as staff in Serayu-Opak Riverbasin, under Indonesian Ministry of Public Works.

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    Readers Comments

    1. dyah on October 10th, 2012 11:59 am

      is there any example on other dams in Indonesia?

      [Reply]





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