Page - 229 - in Book of Full Papers - Symposium Hydro Engineering

Fig. 9 Water Level Elevation of PMF Discharge with CWL application 3.6. SUMMARY In hydrology analysis of the annual PMF discharge that potential to occur in the Sutami Dam is very large at 11,629.14 m3/s, where the PMF discharge value is equivalent to 2.31 x Q1000 years and with the parapet wall as high as 1 m at the top of the dam and CWL management at elevation between + 257.00 m up to +267.00 m still have 3 times potential of overtopping with water level 3.09 m above the top of the dam. The annual PMF flood discharge that potentially occurs in the Lahor Dam is very large at 2,731.00 m3/s, where the discharge value is equivalent to 2.70 x Q1000 years and with the parapet wall as high as 1 m and with CWL management at elevation between +257.00 m up to +267.00 m is not potentially overtopping. The CWL in the Sutami and Lahor reservoirs is difficult to applied because the dams function is to collect water in the rainy season and utilize it during the dry season so that in order to anticipate the possibility of overtopping, emergency spillway is needed to build at the Sutami Dam. Keyword : Flood Control, Overtopping, Reservoir Operation, Water Level 229