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Journal : JURNAL SUMBER DAYA AIR

PERHITUNGAN AWAL IMBUHAN AIRTANAH ALAMI DAERAH ALIRAN SUNGAI CIKAPUNDUNG-GANDOK (KAJIAN PERBANDINGAN) Al Hasyir, Muhammad Humaam; Soenarto, Bambang; Nurhayati, Yayah; Sembiring, Kristina; Tua Naibaho, Pio Ranap
JURNAL SUMBER DAYA AIR Vol 20, No 2 (2024)
Publisher : Direktorat Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jsda.v20i2.902

Abstract

Groundwater recharge is a crucial factor in determining the permissible groundwater extraction within a watershed. In the Cikapundung watershed, the contribution of groundwater to raw water supply has been continuously declining, prompting a shift from groundwater to surface water usage. This study aims to quantify the groundwater recharge volume and recharge coefficient for each geological formation within the Cikapundung-Gandok watershed, covering an area of 90.4 km², and to compare the results with previous studies. The analysis estimates recharge volumes based on rainfall data from 8 stations around the Cikapundung-Gandok watershed from 2010 to 2019, geological formation data, and alternative recharge coefficients. The difference in recharge volume from previous studies is 393,348 m³/year or 1%. Two formations, Qvu and Qyu, which were not identified in earlier studies, supplement the existing geological dataset. The selected recharge volume for the Cikapundung-Gandok watershed is 33,232,004 m³/year or 1.05 m³/s, with the lowest contribution from the Lava formation (Qyl) at 1,364,504 m³/year or 0.04 m³/s and the highest from the Old Volcanic Product (Qvu) at 14,072,243 m³/year or 0.45 m³/s. The tentative recharge coefficients for each rock formation are as follows: Colluvium (Qc) 30%; Unweathered Old Volcanic Product (Qvu) 20%; Sand Tuff (Qyd) 10%; Lava (Qyl) 25%; Pumiceous Tuff (Qyt) 20%; and Young Volcanic Product (Qyu) 20%. The groundwater recharge data obtained can be used to set groundwater extraction limits and to plan for groundwater management using a conservative approach to ensure long-term sustainability.Keywords: groundwater recharge, recharge coefficient, geological formation, groundwater exploitation, Cikapundung-Gandok Watershed
Co-Authors A Riduan Umar Abda Abda Aditya, Zori Afiatur Rizki Ramadhan Al Hasyir, Muhammad Humaam Arif, Muhammad Andi Awal Surono Azhar, Moh. Baggio, Eugene Yudhistira Bagio, Toni Hartono Bambang Budiono Bambang Priyambodo, Bambang Bangun, Sempurna Brillianto, Ananta Giga Budiarto, Rika Budiono, Bambang Dewita, Hikma Diartama, Luh Gede Melyarista Draga Hasan saputra Saputra Eka Daryanto, Eka Fadhila Muhammad Libasut Taqwa Fahmi, Khosa Maulana Fahmy Hermawan Febriyanto, Andreas Fikri, Irwan Ginting, Liberty Herinius Girsang, Pije Saputra Hartono, Arief Budi Heris Cahya Kusuma Hutagalung, Jethro Lukito Ida Ayu Putu Sri Widnyani Imanto, Yuwono Ivindra Pane Khairu Imanda Pratama Kiki Maria Kornel Munthe Kristina Sembiring Kusuma, Heris Cahya Laia, Insyaf Maret Laksono, Arvidya Esta Manlian Ronald A. Manurung, Edison H. Manurung, Edison Hatoguan Moh Azhar Muhammad Andi Arif Nelson Edison Siregar Ni Luh Ayu Suryaningsih Nosi, Leonardus Nurhayati, Yayah Pane, Ivindra Permana, Oki Pujianto, Cahyo Raden Herry Shufi Ramadhani, Fajar Ikhsan Ramdhani, Ferri Riadi, Joan Romy Setiawan, Irvan S, Daniel Salim, Mohd Razman Sampurna Bangun Sarjono Puro Sembiring, Kristiana Sembiring, Kristina Sempurna Bangun Sempurna Bangun Siahaan, Herianto Sianturi, Gestan Sihotang, Parlindungan Simanjuntak, Manlian R. A. Sitepu, Barnet Sitohang, Oloan Sitti Wardiningsih Situmorang, Henry Maurice Soenarto, Bambang Sri Wiwoho Mudjanarko, Sri Wiwoho Subkhan Subkhan Sugeng Riyadi Sunadi, Fajar Sidiq Surbakti, Simon Surono, Awal Syahairony, M. Syahroni, Alif Ihsan Tjahjani, AR Indra Tuheteru, Kadir widyantoro, satrio William, Martin Richardo Wujaya, Kinanti Xena S P, Canda Yudi Firmansyah Yulianto Bastian Zai Yulianto Yulianto