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All Journal Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Journal of Innovation and Applied Technology Jurnal Teknik Pengairan: Journal of Water Resources Engineering Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Teknika Jurnal Pengabdian Masyarakat untuk Negeri (UN-PENMAS) Jurnal Teknologi dan Rekayasa Sumber Daya Air Geosfera Indonesia
M. Amar Sajali
Teknik Pengairan Fakultas Teknik Universitas Brawijaya
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Social Sciences Other

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Comparison of Correlation, PBIAS and RSR between Monthly, Daily, and Hourly GPM Rainfall Data Yunita Ayu Setiyowati; Donny Harisuseno; M. Amar Sajali
Jurnal Penelitian Pendidikan IPA Vol 11 No 6 (2025): June
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i6.11068

Abstract

Accurate precipitation data is critical for hydrological modeling, flood forecasting, and water resources planning. This study evaluates the performance of satellite-based rainfall estimates from the Integrated Multi-satellite Retrievals for GPM (IMERG) Final Run Version 06 by comparing them with ground-based observations from six stations in the Jatigede Reservoir catchment, West Java, Indonesia. The analysis covers the 2014–2023 period, aligning with the reliable availability of IMERG Final Run products, and examines three temporal resolutions: monthly, daily, and hourly. Statistical evaluation employed Pearson correlation coefficient (r), the ratio of RMSE to observed standard deviation (RSR), and Percent Bias (PBIAS). Results show strong agreement at the monthly scale (r = 0.84, RSR = 0.34, PBIAS ≈ +24%), suggesting suitability for long-term water resource assessments. However, performance declines at shorter timescales. At the daily scale, IMERG underestimates rainfall (PBIAS ≈ -27%) with moderate correlation (r = 0.24). The hourly scale shows the poorest performance (r = 0.10, RSR > 3.0, PBIAS < -50%), indicating limitations in capturing short-duration, high-intensity rainfall typical in tropical regions. These findings underscore the importance of temporal aggregation and bias correction when applying IMERG data for operational hydrology and flood modeling
An Integrated Performance Index for Decentralized Water Supply Systems: A Case Study of SiPAS in the Brantas River Basin Ussy Andawayanti; Runi Asmaranto; M. Amar Sajali; Ery Suhartanto; Mustafa Mukti Hidayat; Rizki Tri Utami
Jurnal Penelitian Pendidikan IPA Vol 11 No 8 (2025): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i8.12137

Abstract

To develop and validate an Integrated Performance Index Model (IPIM) for evaluating Simple Water Supply Systems (SiPAS) in the Brantas River Basin, Indonesia. We surveyed, audited, and interviewed stakeholders at 31 SiPAS sites. Latent constructs were tested using SEM–PLS, and dimension weights were optimized with the Generalized Reduced Gradient method. The model explained system performance well (R² = 0.95) and showed high predictive reliability. The technical dimension exerted the strongest influence (72.10%), followed by managerial (26.70%) and social (15.10%) factors. The index differentiated low and high performing sites and was consistent with field audit findings. A companion mobile application enabled real time reporting and feedback to strengthen community participation. IPIM provides a concise, scalable framework for assessing decentralized water supply, prioritizing technical improvements while supporting managerial and social strengthening, and can inform investment and governance decisions for rural water services.
Integrating Irrigation and Potable Water via a Pump-Fed Reservoir: Operational Scenarios and Economic Feasibility in Sukodono Rahmah Dara Lufira; Suwanto Marsudi; Ussy Andawayanti; M. Amar Sajali; Rizki Tri Utami; Santi Sari; Rizki Ramadani Pratama
Jurnal Penelitian Pendidikan IPA Vol 11 No 10 (2025): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i10.12607

Abstract

The Sukodono Reservoir (Gresik, East Java, Indonesia) is a pump-fed, multi-compartment system integrating irrigation and potable supply. We assess scenario-based operations and an economic appraisal. Three vertical-turbine pumps are installed (3×150 L/s); routine operation uses two units at 81% efficiency, yielding 243 L/s for 12 h/day (10.498 m³/day), with the third unit as standby/peak. By 2039, the population is projected at 30.801, requiring 22 L/s, supplied by a 30 L/s WTP. Irrigation storage targets are 120.000 m³ (250 ha core plantation), 270.000 m³ (2.250 ha inter-cropping), and 546.750 m³ (secondary crops). Six phased-expansion scenarios over six years were evaluated. Results show the designed operation reliably meets the 22 L/s potable demand while achieving the irrigation storage targets across scenarios. Base-case economics at a 5.50% discount rate (WACC) indicate IRR 18.50%, BCR ≈ 1.00 (break-even), and payback 7.10 years. We conclude that pump-fed reservoirs can integrate rural water supply and dryland irrigation effectively, although economic performance is marginal under the base case; viability improves with efficiency gains and prudent O&M/Fuel-Cost control.
Permodelan Fluida Dinamik pada Pelimpah Bendungan Karangnongko menggunakan Aplikasi AutoDesk CFD Shadra, Ken Haidar; Sisinggih, Dian; Sajali, Amar
Jurnal Teknologi dan Rekayasa Sumber Daya Air Vol. 6 No. 2 (2026): In Press
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtresda.2026.6.2.60

Abstract

Bendungan Karangnongko yang terletak pada perbatasan Kabupaten Bojonegoro dan Kabupaten Blora di Sungai Bengawan Solo memiliki Pelimpah yang terdiri dari 9 pelimpah dengan pintu radial, pelimpah bebas, dan 2 pipa PLTM. Bendungan Karangnongko dibangun sebagai penyuplai air irigasi, air baku, pembangkit listrik tenaga mikrohidro, dan pengendalian banjir. Dalam proses perencanaannya, diperlukan analisa desain menggunakan uji model untuk mengetahui karakteristik alirannya. Tujuan penelitian ini adalah untuk mengetahui kondisi hidrolika aliran di atas pelimpah Bendungan Karanongko menggunakan pendekatan teoritis dan permodelan Computational Fluid Dynamics (CFD), kemudian dilakukan perbandingan kondisi hidrolika aliran di atas pelimpah antara pendekatan teoritis dan permodelan CFD dengan uji model fisik. Kedua metode tersebut dibandingkan menggunakan metode Root Mean Square Error untuk mengetahui kemiripan kedua metode tersebut. Analisis menggunakan skema debit banjir rancangan Q100, Q1000, dan QPMF dengan setiap debit banjir menggunakan skema bukaan 9 pintu yang memiliki ketinggian bukaan menyesuaikan debit yang lewat. Perbandingan ketiga metode tersebut dilakukan dengan menggunakan metode Root Mean Square Error untuk menilai keakuratan tiap metode.
Sosialisasi dan Optimalisasi Pengelolaan TPST3R di Desa Bentek Kecamatan Gangga Kabupaten Lombok Utara M Amar Sajali; Pitojo Tri Juwono; Rini Wahyu Sayekti; Rahmah Dara Lufira; Laode Almay Fi Ahsany Taqwim; Muhammad Azzikri Aditya Gama; Ilham Rifqi Zaputra
UN PENMAS (Jurnal Pengabdian Masyarakat untuk Negeri) Vol 5 No 2 (2025): UN PENMAS Vol 5 No 2
Publisher : LPPM Universitas Narotama

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Optimalisasi Pengelolaan Sampah Terpadu melalui Pendekatan Reduce, Reuse, Recycle (3R) di Desa Bentek, Kecamatan Gangga, Kabupaten Lombok Utara. Program ini dirancang untuk meningkatkan kesadaran masyarakat akan pentingnya pengelolaan sampah yang tepat dan berkelanjutan. Pelaksanaan program melibatkan survei terhadap sistem pengelolaan sampah yang ada, analisis data yang terkumpul, serta program sosialisasi yang ditujukan kepada masyarakat, terutama siswa di Madrasah Tsanawiyah. Hasil kegiatan menunjukkan peningkatan yang signifikan dalam pemahaman masyarakat mengenai teknik pemilahan sampah dan dampak negatif dari pengelolaan sampah yang tidak tepat. Selain itu, program ini berhasil melibatkan partisipasi aktif masyarakat dalam berbagai kegiatan pengelolaan sampah, menekankan pentingnya tanggung jawab bersama dalam mengatasi tantangan lingkungan. Solusi yang diusulkan meliputi pembangunan fasilitas pengolahan sampah yang lebih baik serta implementasi program edukasi berkelanjutan untuk menjaga kesadaran dan keterlibatan masyarakat. Intervensi ini bertujuan menciptakan lingkungan yang lebih bersih dan sehat di Desa Bentek, serta meningkatkan kualitas hidup warganya. Dengan mengatasi aspek praktis dan edukatif, program ini menjadi langkah penting menuju pengelolaan sampah yang berkelanjutan, berkontribusi pada pelestarian lingkungan dan pemberdayaan masyarakat setempat untuk mengadopsi solusi ramah lingkungan jangka panjang.
Flood Risk and Economic Loss Assessment in the Lower Citarum Basin Using InaSAFE Rahmah Dara Lufira; Suwanto Marsudi; Ussy Andawayanti; Ery Suhartanto; M. Amar Sajali; Rizki Ramadhani Pratama
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 23, No 2 (2026): July 2026
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v0i0.%p

Abstract

The hydrometeorological hazard of flooding in the Lower Citarum River Basin constantly affects agricultural sustainability, infrastructure, settlements, and regional economic activities. This study used InaSAFE to model human exposure and economic losses due to flooding under a 50-year return-period scenario. Flood depths were classified as >1.5 m (high), 0.76–1.5 m (medium), and ≤0.76 m (low) and then overlaid with spatial layers of population, land cover, roads, and buildings. The results revealed 1,739,195 exposed individuals, with 1,067,442 requiring evacuation support from medium-to high-depth classes. The different types of land cover exposed to floods cover 126,413 ha, mainly agricultural areas. The minimum humanitarian relief needs are US$ 88.00 million. The losses from buildings and public facilities totaled USD 616.51 million, and for road infrastructure, they amounted to USD 1.23 million, providing a subtotal of primary direct losses of USD 894.67 million. Additional proxy-based elements raised the stretched notional economic-loss estimate to USD 2.64 billion. These results offer a baseline for additional studies on flood-risk reduction and future scenario-based analyses of possible mitigation alternatives; they are not an explicit evaluation of the hydraulic or economic effectiveness of the Cijurey Dam.
Integrated WDPI–WEAP Framework for Multi-Scenario Evaluation of Irrigation Water Delivery Performance: A Case Study of Wawotobi Irrigation System, Indonesia Rindang Santiago Samudra Suwarjo; Sri Wahyuni; M. Amar Sajali
Jurnal Penelitian Pendidikan IPA Vol 12 No 7 (2026)
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i7.15366

Abstract

The operational performance of aging irrigation infrastructure in tropical developing countries remains poorly understood at the zone level, since aggregate evaluation conceals inter-zonal disparities. This study evaluated the Wawotobi Irrigation System, a 42-year-old scheme served by Wawotobi Weir, encompassing 11,595 ha across five zones in Southeast Sulawesi, Indonesia, using an integrated Water Delivery Performance Index (WDPI) and Water Evaluation and Planning (WEAP) framework under normal-year (Q50) and dry-year (Q80) conditions. Zone-disaggregated evaluation revealed a composite WDPI of 0.39 (poor), with adequacy ranging from 0.31 to 0.79 and reliability as low as 0.00 in two zones. Sensitivity analysis identified intake withdrawal capacity as the dominant constraint on reliability (sensitivity index = 2.81), whereas transmission loss coefficients showed uniformly low sensitivity. Multi-scenario simulation showed that Intake Optimization achieved the highest performance (WDPI of 0.76 under Q50 and 0.56 under Q80), while Downstream Priority reallocation proved counterproductive, reducing equity from 0.58 to 0.10 under Q50 by withholding supply from lower-priority zones. A strong adequacy-reliability correlation (r = 0.91 under Q50) explains why intake-focused interventions outperform distributional adjustments alone, identifying intake capacity enhancement as the most effective strategy for improving irrigation performance in aging tropical systems.
Co-Authors Aufa Hanan A Beselly Putra, Sebrian Mirdeklis Camila, Adristi Nur Dewanti, Wahyuning Dian Sisinggih Donny Harisuseno Donny Harisuseno Donny Harisuseno Ery Suhartanto Ery Suhartanto Haribowo , Riyanto Haribwowo, Riyanto Ilham Rifqi Zaputra Keisuke Murakami Laode Almay Fi Ahsany Taqwim Linda Prasetyorini Marsudi, Marsudi Muhammad Azzikri Aditya Gama Mustafa Mukti Hidayat Pitojo Tri Juwono Rahmah Dara Lufira Rindang Santiago Samudra Suwarjo Rini Wahyu Sayekti Rizki Ramadani Pratama Rizki Ramadhani Pratama Rizki Tri Utami Rizki Tri Utami Runi Asmaranto Runi Asmaranto Santi Sari Setiawan, Dodi Bagus Setiyowati, Yunita Ayu Shadra, Ken Haidar Sofriansyah, Rafi Satria Sri Wahyuni Sumiadi, Sumiadi Suwanto Marsudi Ussy Andawayanti Very Dermawan Winnie Meilinda Dewi Yunita Ayu Setiyowati