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All Journal TEKNIK Journal La Multiapp
Pakpahan, Samuel Seprian
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering

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Risk Analysis of the Prijetan Dam in Lamongan Regency Pakpahan, Samuel Seprian; Sangkawati, Sri; Suharyanto, Suharyanto
Journal La Multiapp Vol. 5 No. 6 (2024): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v5i6.1736

Abstract

The Prijetan Dam in Lamongan, East Java, has been in operation for over a century, making it one of the oldest dams in Indonesia. This study aims to assess the risks associated with the aging structure of the dam, including potential failures and safety concerns. The analysis was conducted using the ICOLD modified risk scoring system and the Failure Mode Effects Analysis (FMEA) method, taking into account physical deterioration, climate change impacts, and possible failure modes. The results provide insights into the current physical condition, risk levels, and necessary mitigation strategies to enhance the dam's safety and functionality. The study also prioritizes maintenance and rehabilitation actions based on risk levels, ensuring long-term operational safety and security for the surrounding areas.
Analysis of Erosion and Sedimentation Rates in Karian Reservoir using the USLE Method on the Reservoir's End-of-Life Capacity Pakpahan, Samuel Seprian; Sachro, Sri Sangkawati; Suharyanto, Suharyanto
TEKNIK Vol 46, No 2 (2025) April 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i2.67990

Abstract

Karian Reservoir is a multipurpose reservoir designed to meet raw water needs, provide irrigation water supply, reduce flooding, and generate micro-hydropower potential. It has a dead storage capacity of 46.4 million m³ with a projected service life of 100 years, based on the time required for sediment to fill the dead storage. The planned sedimentation rate of 579,162 m³/year was determined using an empirical formula derived from sediment curves based on tributary surveys conducted in 1995. If sedimentation exceeds dead storage capacity, the reservoir's lifespan and ability to meet water demands will be compromised, making it crucial to analyze sedimentation rates and distribution. Erosion rate analysis using the USLE method for the period 2017-2023 resulted in an average erosion rate of 1,249,177.27 tons/year, with a Sediment Delivery Ratio of 0.304 and a trap efficiency of 95%, leading to a sedimentation rate of 328,397.28 tons/year. The sediment deposition distribution over 100 years, estimated using the Empirical Area Reduction Method, indicated that the new base level would rise by 10.17 meters to an elevation of 30.17 meters. The remaining dead storage capacity is 21.12 million m³ (45.48%), with an effective storage capacity of 112.83 million m³ (96.38%). Theoretically, Karian Reservoir can still achieve its full service life..
Co-Authors Sri Sangkawati Sachro Suharyanto