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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL 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 Teknik Sumber Daya Air 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 Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Social Sciences Other

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Journal : Jurnal Penelitian Pendidikan IPA (JPPIPA)

 1 
Comparison of Correlation, PBIAS and RSR between Monthly, Daily, and Hourly GPM Rainfall Data Setiyowati, Yunita Ayu; Harisuseno, Donny; Sajali, M. Amar
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 Andawayanti, Ussy; Asmaranto, Runi; Sajali, M. Amar; Suhartanto, Ery; Hidayat, Mustafa Mukti; Utami, Rizki Tri
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 Lufira, Rahmah Dara; Marsudi, Suwanto; Andawayanti, Ussy; Sajali, M. Amar; Utami, Rizki Tri; Sari, Santi; Pratama, Rizki Ramadani
Jurnal Penelitian Pendidikan IPA Vol 11 No 10 (2025): October: In Progress
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.
Co-Authors Abi Aulia Yanottama Aditama, Dimas Hafiz Anggara Wiyono Wit Saputra, Anggara Wiyono Wit Aufa Hanan A Beselly Putra, Sebrian Mirdeklis Briantama, R. Haryo Camila, Adristi Nur Dewanti, Wahyuning Dian Sisinggih Dian Sisinggih Donny Harisuseno Donny Harisuseno Donny Harisuseno Ery Suhartanto Evi Nur Cahya Hadi, rafli mas Haribowo , Riyanto Haribwowo, Riyanto Hidayat, Mustafa Mukti Irsam, Ramadhanti Mutiara Karin, Indriana Vaninda Keisuke Murakami Laksono Trisnantoro Linda Prasetyorini Linda Prasetyorini Moch Rizky Sya'bana Muchammad Zidan Muhammad Ridho Abdillah Narendra, Narendra Agung Setya Virgosa Otta, Rhea Rachma Pitojo Tri Juwono Pratama, Rizki Ramadani Rahawarin, Ridho Fahreza Rahmad Aziz Saputra Rahmah Dara Lufira Reza Andrean Riyadi, Bagus Riyanto Haribowo Riyanto Haribowo Runi Asmaranto Santi Sari Saranani, Muh. Rivan Setiyowati, Yunita Ayu Sofriansyah, Rafi Satria Sumiadi Sumiadi, Sumiadi Suwanto Marsudi Ussy Andawayanti Utami, Rizki Tri Very Dermawan Very Dermawan Wibowo, Hindrawan Tri Winnie Meilinda Dewi