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All Journal Alchemy : Journal of Chemistry Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Jurnal Teknik Sipil Civil Engineering Journal Jurnal Rekayasa Konstruksi Mekanika Sipil JURNAL SUMBER DAYA AIR Jurnal Teknologi Dan Sistem Informasi Bisnis Jurnal Komposit : Jurnal Ilmu-Ilmu Teknik Sipil Journal of the Civil Engineering Forum Profisiensi : Jurnal Program Studi Teknik Industri Jurnal Teknik Sumber Daya Air Indonesian Research Journal on Education Jurnal Pengabdian Masyarakat Dharma Andalas Jurnal Teknik dan teknologi tepat guna Ambidextrous : Journal of Innovation, Efficiency and Technology in Organization
Mohammad Farid
Program Pascasarjana Teknik Sumber Daya Air, Fakultas Teknik Sipil dan Lingkungan. Institut Teknologi Bandung, Jl. Ganesha No. 10 Bandung, 40132.
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Journal : Civil Engineering Journal

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Discharge Estimation for Groundwater Basin Fully Delineated Watersheds Based on the Modified Rational Equation Mayavani, Christine; Soekarno, Indratmo; Farid, Mohammad; Taufiq, Ahmad; Farid Fakhruddin, Muhammad
Civil Engineering Journal Vol. 12 No. 3 (2026): March
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2026-012-03-04

Abstract

The integration of surface water and groundwater is essential for sustainable water resources management, as both components are hydrologically interconnected through runoff, interflow, and baseflow processes. Surface water and groundwater are inseparable components of the hydrological system, contributing significantly to streamflow and to the calculation of water availability in watersheds. A previous study proposed a simpler, improved equation based on a rational method to estimate potential discharge for fully delineated watersheds within a single groundwater basin. Therefore, this study aimed to analyze potential discharge by applying an equation from previous reports with the addition of a beta (β) parameter to enhance performance. The modified rational equation was compared with three existing methods, namely FJ Mock, Sacramento, and NRECA, across six selected watersheds, including Cidanau, Kupang, Kuto, Sampean, Belawan, and Kumai. The results showed that the modified rational equation achieved the highest correlation coefficient and very good RSR classification, except for Kuto and Belawan. This showed that incorporating the β parameter as a baseflow correction factor in the Modified Rational Equation enhanced model accuracy, as indicated by higher correlation and lower RSR values. Optimal β values showed a strong relationship with watersheds-to-groundwater basin area ratio (AWS/AGWB), determined through an iterative process. The modified rational equation performed optimally in small watersheds (<250 km²), with correlation values >60% in catchments like Cidanau, Kupang, and Kuto. However, the accuracy decreased in larger areas, suggesting suitability for small-scale hydrological systems. The enhancement of the modified rational equation using the β parameter showed an alternative method for determining water availability and potential to improve the development of strategic frameworks of water resource management in Indonesia.
Co-Authors Adelino, Muhammad Ilham Adi Kuntoro, Arno Adi Prasetyo Adi Prasetyo Adityawan, Mohammad Bagus Ahmad Taufiq Akyunul Jannah Anik Maunatin Antalia K.M. Katili Arno Adi Kuntoro Arno Adi Kuntoro, Arno Adi Arumjeni Mitayani Aryanti Karlina Nurendyastuti Audrienne, Resanti Avis Mellivera Bagus Adityawan , Mohammad Bagus Pramono Yakti Bin Ishak, Ismayuzri Burnama, Nabila Siti Calvin Sandi Chaidar, Ana Nugranah Chaidar, Ana Nurganah Dantje Kardana Natakusumah Dendy Permana Dewi, Alfita Dhemi Harlan Dina P.A Hidayat Eka Oktariyanto Nugroho Erha Intan Sukmajati Fachri, Fiqih Jul Faisal Yunus Faizal Immaddudin Wira Rohmat Farid Fakhruddin, Muhammad Fatchurrohman, Nanang Febry, Muhammad Fitri, Meldia H, Rommy Hadiarto Mangunnegoro Harkunti P. Rahayu Harkunti P. Rahayu, Harkunti P. Huseiny, Mohammad Iqbal Idham Riyando Moe Idham Riyando Moe Imani, Rafki Indratmo Soekarno Irfan Sudono Iwan Kridasantausa (alm.) Joko Nugroho Kedafota, Fahrul Kesuma, Tri Nugraha Adi Khilmi Zain Kholik, Almira Abdul Kirana, Pratita Hana Ledowikj, Felix Joel Lestari, Ovi M. Bagus Adityawan, M. Bagus Masri nur Sultan Mayavani, Christine Mellivera, Avis Mochamad Mardi Marta Dinata Mochammad Ridwan Muhammad Rizki Purnama Muhammad Syahril Badri Kusuma, Muhammad Syahril Badri Muhammad, Al Nana Nasuha Djuhri Nofriadirman Novintasari Nadeak Nurmaulia, Sella Lestari Permana, Salsa Alfadhila Pratama, Maryo Inri Prima Putra, Kahar Halim Purnama, Vicky Candra Rahayu, Harkunti Pertiwi Rasmiaditya Silasari Rasmiaditya Silasari Rohman, Mutiara Indah Nur Sarah Abighail siti rodiah Sri Legowo W. D Sri Legowo Wignyo Darsono Suardi Natasaputra Sultan, Masri nur Tia Setiawati Tia Setiawati Waluyo Hatmoko Wicaksono, Rofidzias Siswo Widodo Widodo Widyaningtias Widyaningtias, Widyaningtias Widyaningtyas, Widyaningtyas Wisanggeni, Dimas H. Yakti, Bagus Pramono Yetrina, Mutiara Zain, Khilmi Zefri Yenni