DESIGN OF STEPPED CHUTE SPILLWAY FOR THE MENINTING DAM IN WEST LOMBOK REGENCY, WEST NUSA TENGGARA BARAT

• Main Author: Alessandro, Clarence
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/83396
• Institution: Institut Teknologi Bandung

The Meninting Dam, covering a watershed area of 32.77 km2, is currently under construction in West Nusa Tenggara to address water-related challenges on the island of Lombok. The dam serves the purpose of supplying raw water to the network system, irrigation systems, and a small hydropower plant (PLTMH). This study involves flood discharge calculations, the potential of Meninting Dam, the design of the spillway structure with a stepped spillway type, including hydraulic analysis, spillway structure stability, and the design drawings of the spillway structure. Additionally, this study covers operation and maintenance, as well as the construction cost estimates of the spillway structure. This final project aims to determine the effectiveness comparison between stepped chute spillways and conventional chute spillways. The spillway structure design uses QPMF discharge. The spillway structure modeling is conducted using HEC-RAS. Based on the results of this design, it was found that the stepped spillway is more effective in mitigating cavitation and energy dissipation, with the cavitation index and energy dissipation rate of the stepped spillway being higher than those of the conventional spillway.