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Sukamta Sukamta
Departemen Teknik Sipil FT. UNDIP Jl. Prof. H. Soedarto SH., Tembalang, Semarang 50275
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Assessment of Sadawarna Dam to Support Environmentally Sustainable Development Setiawan, Rizki Bangun; Suharyanto, Suharyanto; Sukamta, Sukamta; Asad, Mohammad Bagus Wiratama
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 2 (2025): EDISI SEPTEMBER 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i2.6999

Abstract

 Sadawarna Dam, one of Indonesia's national strategic projects, located in the Cipunegara River Basin, plays a crucial role in ensuring food security, controlling floods, and providing a raw water supply. Community activities around the reservoir have the potential to degrade water quality, making continuous monitoring necessary. This study evaluates the water quality condition of Sadawarna Dam through analysis of physical, chemical, and biological parameters using the Pollution Index method (Minister of Environment Decree No. 115 of 2003) in the upstream, reservoir, and downstream areas, providing a comprehensive overview of pollution levels and their relevance to environmentally sustainable principles. Measurement results show that, based on Class I Water Quality Standards, the Pollution Index (PI) values range from 3.61 to 5.20. In comparison, based on Class II Standards, the PI values range from 3.54 to 5.11. These values indicate that water quality in the reservoir and downstream areas falls into the "Lightly Polluted" category, while the upstream area is classified as "Moderately Polluted." These findings emphasize the importance of water quality monitoring as a strategic environmental management measure to maintain the sustainability of the reservoir ecosystem and its benefits for the community. Therefore, the solution is to strengthen regular water quality monitoring systems, identify pollution sources, and promote collaborative efforts among the government, communities, and other stakeholders to ensure sustainable and environmentally sound reservoir management.
Penilaian Kinerja Operasi dan Pemeliharaan Menuju Bendungan Serbaguna Wonogiri yang Berkelanjutan Setiawan, Rizki Bangun; Suharyanto, Suharyanto; Sukamta, Sukamta
Jurnal Talenta Sipil Vol 9, No 1 (2026): Februari
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/talentasipil.v9i1.1168

Abstract

Gajahmungkur also known as the Wonogiri multipurpose dam, is a long-standing dam in Wonogiri Regency, Central Java Province. After nearly five decades of operation, an evaluation of the dam's operational and maintenance performance is necessary to ensure its continued function. This study aims to analyze the actual condition of the Wonogiri multipurpose dam through a condition index assessment method for each dam component based on primary and secondary data. The assessment process is carried out by determining a condition index value that reflects the level of performance and safety of the dam area. The analysis results show that the Wonogiri multipurpose dam obtained a condition index value of 3, which is included in the moderate damage category. This finding indicates the need for maintenance measures to prevent further damage. Based on the results of observations, dense grass growth, sedimentation, and the need for repairs to the hydromechanical equipment were found. This emphasizes the importance of proper evaluation and repair for optimal and sustainable dam operation. The recommendations from this study are expected to guide more effective and efficient dam management in the future.
Back Analysis dan Validasi Numerik-Manual Parameter Residual Soil: Studi Kasus Longsoran Bendungan Bagong Al Qorni, Muhammad Rizqi Uwais; Sadono, Kresno Wikan; Sukamta, Sukamta
Jurnal Talenta Sipil Vol 9, No 1 (2026): Februari
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/talentasipil.v9i1.1292

Abstract

A landslide on the left abutment of the Bagong Dam on 14 August 2025 indicated a significant gap between the design parameters and the actual field conditions, particularly within the critical zone of weathered limestone and residual soil (RQD = 0–11%). This study aims to validate the geotechnical parameters of the dam abutment through back analysis of the actual landslide and to formulate safe slope geometry design recommendations. A comprehensive research methodology is employed, integrating geological characterization based on six boreholes, parametrized back analysis using ten reference materials with similar geological conditions, cross-method validation between the Limit Equilibrium method (manual Fellenius method) and the finite element method (PLAXIS LE), GSI–Hoek–Brown validation for weathered rock zones, and parameter sensitivity analysis. The results show that the validated parameters c = 35,5 kPa and φ = 23° represent the critical field conditions, yielding safety factors of FS = 1,173 (PLAXIS LE) and FS = 1,2588 (Fellenius method), with an inter-method deviation of 7,32%. Sensitivity analysis identifies the pore pressure ratio (Ru) as the dominant controlling factor (ΔFS/ΔRu = –0,155), explaining the failure mechanism during the rainy season. The optimal design recommendation is a stepped slope geometry with a single berm at elevation 320 m and a slope angle of 33°, resulting in FS = 1,629, which satisfies construction safety criteria (FS ≥ 1,35) and represents a 38,8% increase in stability compared with the existing condition.
Co-Authors Adi Putra, Kukuh Cahya Aditya Sage Pamungkas Agus Jamal Agus Suprihanto Agus Winarno, Agus Agusta, Rivga Agustina, Nurhaliza Aini, Afifah Nur Al Qorni, Muhammad Rizqi Uwais Alfiannur, Angga Alfiannur Aliputa, Henu Satya Ami tri Fatrin Anderika Pradhita Andru Fajar Febrianto Andryan Mistavhirul P Ari Dwiearto, Hasan Asy Arif Akbarul Huda Arif Hidayat Asad, Mohammad Bagus Wiratama As’ari, Muhammad Agung Asshidiqie, Muhammad Rony Atikasari, Tiara Cahya Ay Lie Han Ay Lie, Han Bagus Acung Bilahi Baharudin, Irfan Bobby Rio Indriyantho Budi Rohmad Wijayanto Budiyantoro, Cahyo Caroko, Novi Darwin Hartono Dedet Hermawan Setiabudi, Dedet Hermawan Dianugrah, Rizki Dimas Prasetyo Nugroho Doni Apriadi Putera Dwi Aries Himawanto Elfrida Gresih Lumbantobing Erista, Dicky Fajar Wahyu Putranto Ferry Hermawan Fitri Wahyuni Frediyansyah, Mochammad Tommy Galih Widyarini Gunawan Budiyanto Han Ay Lie Han Ay Lie Harahap, Yudani Alamsyah Hardi Wibowo Hardi Wibowo Hari Nugroho Haryoko, Haryoko Hazim, Muhammad Fadhlurrahman Heru Kristanto Himawan Indarto Holyness Nurdin Singadimedja Husda, Syamsul Muarif Ilham Abadi, Ilham Ilham Nurhuda Inabah, Redha Fatki Indarto Indarto Indrastono Dwi Atmanto Intan Fitriani Junaedi Utomo Kamiel, Berli Paripurna Khrisnawan Arief Wicaksono Kresno Wikan Sadono Krisna Harimurty Kuni Saadati Lie , Han Ay Lisatia Dian Pithaloka Listiyono Budi Liza Azizah M. Yudi Purnawan Mashuri Amin D. Mega, Windha Muhammad Razi Muzthohidun, Muhammad Nasmiarta, Zhafarina Malaha Nauval Rabbani Nazila, Kamila Shaomi Nicolaus Iyowau Nugroho, Dedy Melianto Nuroji Nuroji Nurrahman, Budi Parang Sabdono Parang Sabdono Parang Sabdono Patrick Matheus Permana, Agung Pramudiharto, Aji Pratama, Sadewa Eka Purnomo Purnomo Purwanto Purwanto Purwanto Purwanto R Dian Chintami R.Risang Haryo C.D. Raden Mohamad Herdian Bhakti Rini Marlina, Rini Rudi Yuniarto Adi Rudy Suryanto, Rudy S. Wisnu B. Sanggabuana Satria K Saputra, Agel Septesen Nababan Setiawan, Rizki Bangun Shomad, Muhammad Abdus Sidqi Muhammad Siti Hardiyati Sri Sangkawati Sachro Sri Tudjono Sri Tudjono Subandono, Bagus Sudarja Sudarja Sudarja, Sudarja Suharyanto Sulistya, Krisna Sulistyowati, Rizki Aulia Suprapto Suprapto Suryanto, Arwan Susilo Adi Widyanto Syaiful Anshari Thoharudin, Thoharudin Tri Agung Rohmat Tri Agung Rokhmat, Tri Agung Triana Setianingrum Tunggal Bagas Yuliawan Umam, M.Muhtajul Utama, Nafi Ananda Utomo, Jati Wicaksono, Dwi Aji Widyasmoro, Widyasmoro WINDHA MEGA PRADNYA DHUHITA Windu Partono Wiyana, Satria Hadi Yudo Prasetyo Yulfyandika Manggala Putra Yulita Arni Priastiwi Yurianto Yurianto