Seepage analysis of the Mamak Dam, Indonesia: a case study

In general, the current performance evaluation of the Mamak Dam falls into the “fairly good” category, even in the aftermath of the earthquake event with a magnitude of 6.5 Mw in 2018. However, the presence of leakage on the downstream slope has become an issue that requires attention. This study analyses seepage using GeoStudio and Slide Rocscience software. The seepage rates obtained from instrument readings exceed those calculated by GeoStudio and Slide Rocscience software. All of the obtained seepage rate results do not surpass the maximum allowable seepage rate requirements. The most critical gradients are from flood water level cases in Saddle Dam-1 and Saddle Dam-2. They reached values of 0.35 and 0.34, which fall below the maximum hydraulic gradient.