Detection of seepage source path location in Selorejo downstream foothill dam using georadar

• Main Authors: Laksono, Yoyok Adisetio, Siti Zulaikah, Siti Zulaikah, Sutrisno, Sutrisno, Yusop, Zulkifli, Suaidi, Daeng Ahmad, Abdulloh Fuad, Abdulloh Fuad, Rahman, Moch Bagas Setya, Anggana, Qorny Faren
• Format: Conference or Workshop Item
• Published: 2020
• Subjects: TA Engineering (General). Civil engineering (General)
• Online Access: http://eprints.utm.my/id/eprint/92773/; http://dx.doi.org/10.1063/5.0015745
• Institution: Universiti Teknologi Malaysia

The monitoring found the seepage at the wall canal at downstream foothill in the Selorejo dam. It is a sign that there is water leakage from the dam. To better understand the path of leakage water, some locations of the dam were scanned using 90 MHz radar. The scanning location was done at three locations, namely at (1) the top, (2) the middle slope downstream hill, and (3) the downstream foothill dam using profiling. All those locations were scanned using the B-scan technique. The methods of analysis employed in this research were a gain profile, bandpass filter, and average subtraction to see the radargram clearly. The results found that there are two paths of seepage that started from the top dam. This path shows clearly at the middle slope dam, and this path is unified along before foothill downstream. It implies that seepage might be an early stage of the internal erosion process.