EVALUATION OF OPEN CHANNEL DRAINAGE IN THE MINING AREA OF BLOK SAWIT PT PPA AT PT ABC JOBSITE USING HEC-RAS SIMULATION
DOI:
https://doi.org/10.33579/krvtk.v11i1.5889Keywords:
Rainfall, runoff, inundation, open channel, HEC-RASAbstract
The mining area of PT PPA site PT MLP, specifically in the Sawit Block, has flooding on the road. This problem is supported by the fact that the rainfall intensity at the research site is classified as heavy (25.61 mm/hour). Open channels are one of the most important infrastructures for draining runoff water. However, there are areas without open channels and channels with insufficient capacity. This indicates that the existing mining drainage system is not optimal. Therefore, a study and design of open channels in the Sawit Block area are required. This research estimates surface water flow using the rational method, considering rainfall intensity (Mononobe), DTH characteristics, and runoff coefficients (Gautama). The runoff flow rate values are used as a reference in assessing and designing the dimensions of the open channel (Manning equation). A simulation of potential flooding in HEC-RAS is then conducted as a form of validation for the channel dimensions obtained from the calculations. The rainfall intensity value obtained is 25.61 mm/hour with a 2-year return period, and a hydrological risk of 88%. Based on calculations using the Manning equation and simulations in HEC-RAS, design modifications are required for open channel 1 at DTH 4 and an expansion of open channel 4 at DTH 6. However, the actual capacity of open channels 2 and 3 is already sufficient.
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References
F. Rahmi and D. Yulhendra, “Optimalisasi Pit Limit Penambangan Mineral Nikel Laterit PT. Antam Tbk. Unit Bisnis Penambangan Nikel di Site Pomalaa Sulawesi Tenggara di Front X,” Skripsi, Jurusan Teknik Pertambangan, Universitas Negeri Padang, 2019.
D. Y. Rohmaningrum and J. R. Horman, “Nickel Laterite Cut Off Grade at Block 1A PT. Anugrah Sukses Mining: Cut Off Grade Nikel Laterit pada Blok 1A Pt. Anugrah Sukses Mining”, Program Studi S1 Teknik Pertambangan Universitas Papua, vol. 3, no. 1, pp. 20–25, Mar. 2022. DOI: https://doi.org/10.56139/intan.v3i1.46
Triatmodjo. “Hidrologi Terapan”. Yogyakarta: Beta Offset, 2009
Y. C. Mendrofa, Tedy Agung Cahyadi, and Shofa Rijalul Haq, “Rancangan Saluran Pada Pemindahan Aliran Sungai Kili Besar Di Area Pertambangan Batubara di Lahat, Sumatra Selatan Menggunakan Apllikasi HEC-HMS dan HEC-RAS”, Prosiding Seminar Nasional ReTII, vol. 18, no. 1, p. 433~439, Nov. 2023.
T. A. Buishand, “Some Remarks on the Statistical Testing of Homogeneity of Rainfall Records,” Journal of Hydrolog, vol. 58, no. 1-2, pp. 11-27, August 1982. DOI: https://doi.org/10.1016/0022-1694(82)90066-X
T. C. Upomo dan R. Kusumawardani, “Pemilihan Distribusi Probabilitas pada Analisa Hujan dengan Metode Goodness of Fit Test,” Jurnal Teknik Sipil & Perencanaan, vol. 18, no. 2, pp. 139-148, 2016. DOI: https://doi.org/10.15294/jtsp.v18i2.7480
D. A. Nugroho, M. Firdaus, dan H. D. Ariyanto, “Analisis Ukuran Penyebaran Data (Kemiringan dan Keruncingan) (Studi Kasus:Riwayat Penjualan Usaha Makanan Ibu Apri),” 2020.
Limantara, “Rekayasa Hidrologi”. Malang: Andi, 2018.
S. Suyono, S. Sosrodarsono, and T. Kensuke, Hidrologi untuk Pengairan. Jakarta: PT Pradnya Paramita, 2003.
M. Lund, E. van Etten, J. Polifka, M. Q. Vasquez, R. Ramessur, D. Yangzom, and M. L. Blanchette, "The importance of catchments to mine-pit lakes: Implications for closure," Mine Water and the Environment, vol. 39, no. 3, pp. 572–588, 2020. doi: 10.1007/s10230-020-00704-8.
R. S. Gautama, Diktat Kuliah Sistem Penyaliran Tambang. Bandung: FIKTM ITB, 1999.
Bimantoro, “Rancangan Geometris Saluran Terbuka dengan Validasi Pemodelan Genangan Software HEC–RAS,” Indonesian Mining Professional Journal, 2024
Suripin. Sistem Drainase Perkotaan yang Berkelanjutan. Yogyakarta : ANDI Offset.2004
H. F. P. Simanjuntak, P. Manik, and A. W. B. Santosa, "Analisa Pengaruh Panjang, Letak dan Geometri Lunas Bilga Terhadap Arah dan Kecepatan Aliran (Wake) Pada Kapal Ikan Tradisioal (Studi Kasus Kapal Tipe Kragan)," Jurnal Teknik Perkapalan, vol. 5, no. 1, pp. 345-352. April 2017.
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