Dam Break Analysis of Sermo Dam

Sermo Dam is located in the Special Region of Yogyakarta and serves multiple purposes including providing drinking water, supplementing irrigation systems Kalibawang area, flood control. According to data published by World Commission, 60% mitigation measures taken overcome impact dam structure failures are unsuccessful. The simulation failure as a crucial aspect plans strategies because it more destructive than natural waves. This research used HEC-RAS 5.0.7 examine inundation mapping simulate two dimensions. However, Break Analysis was adopted provide Emergency Action Plan Guide guide managers community. overtopping scenario adapted model based on frequent occurrence heavy extreme precipitation affected area. Data were analyzed using unsteady flow PMF discharge with peak inflow 1276.6 m³/s, which result an area 9394 hectares maximum height 17 m. failure-induced floods tend potentially affect eight sub-districts Kokap, Pengasih, Sentolo, Wates, Panjatan, Galur, Lendah, Temon. piping also considered potential damage that tends occur. In scenario, biggest flooding 5112 13 About six Kokap Sentolo being excluded from list. Therefore, establish early warning infrastructure mitigate disaster risks. results this can inform evacuation planning, estimation, post-flood rehabilitation efforts areas.