Analisis Kinerja Spillway Bendungan Wonogiri Untuk Keamanan Bendungan

Nugroho, Adi and , Ir. Isnugroho, CES (2025) Analisis Kinerja Spillway Bendungan Wonogiri Untuk Keamanan Bendungan. Skripsi thesis, Universitas Muhammadiyah Surakarta.

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Abstract

Wonogiri Dam, which began operation in 1981, is one of the key infrastructures constructed to regulate water resources and mitigate flood risks. After more than five decades of operation, changes in rainfall patterns and land use within the Wonogiri Dam Watershed (DAS) have altered the inflow flood hydrograph entering the reservoir. Therefore, it is necessary to reanalyze the spillway’s performance. This study begins with an analysis of maximum daily rainfall using data from 2009–2023, followed by an areal rainfall analysis employing the Thiessen Polygon Method. Subsequently, the design rainfall is calculated using the Log Pearson Type III method. The resulting design rainfall data are then used to analyze the design flood discharge using the Nakayasu Synthetic Unit Hydrograph method for a 1,000-year return period and the Probable Maximum Flood (PMF), which is derived based on the Probable Maximum Precipitation (PMP) from the Isohyet method. Under PMF conditions, the operation of the spillway gates according to the original design results in the maximum water surface elevation reaching +138.37 m above sea level (m.a.s.l), which exceeds the initial design maximum water level. To ensure that the reservoir water level does not surpass the original design, the spillway gates must be fully opened when the reservoir elevation exceeds +137.50 m. Based on the flood routing analysis, with a PMF inflow discharge (QPMF) of 6,357.1 m³/s, the maximum reservoir water level would reach +138.297 m.a.s.l, remaining below the original design limit of +138.30 m.a.s.l. Therefore, for dam safety, during extreme rainfall events, the spillway gates must be fully opened when the reservoir elevation rises above +137.50 m.a.s.l.

Item Type:	Thesis (Skripsi)
Uncontrolled Keywords:	Flood Routing; Probable Maximum Flood (PMF); Spillway Performance
Subjects:	T Technology > TA Civil Engineering
Divisions:	Fakultas Teknik > S1 Teknik Sipil
Depositing User:	ADI NUGROHO
Date Deposited:	14 Nov 2025 01:40
Last Modified:	14 Nov 2025 01:40
URI:	http://eprints.ums.ac.id/id/eprint/139371

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