Flood Model of Downstream Kali Lahar Using HECRAS

Ayisya Cindy Harifa; Fadjar Purnomo; Sutikno Sutikno

doi:10.33366/rekabuana.v8i2.5075

Flood Model of Downstream Kali Lahar Using HECRAS

Ayisya Cindy Harifa, Fadjar Purnomo, Sutikno Sutikno

Abstract

Flooding that occurs in the area around Kali Lahar is a problem that always occurs when the rainy season. This research aims to find the causes of flooding in Kali Lahar, located on Jalan Letjen Sutoyo, Malang City, by considering the hydrological conditions in the Kali Lahar subwatershed. The data used in the analysis is rain data from the Sukun, Ciliwung, and Petungsewu stations, with the same data range between 2008 and 2020. There is also spatial data such as DEMNAS and river networks. The analysis is carried out by modeling floods with synthetic unit hydrographs, which are then modeled with HEC-RAS 1D and 2D software to determine whether the river can accommodate flood discharge with a return period of 10 years. The discharge produced by Unit Hydrograph Nakayasu was 134.25 m³/s. This discharge is modeled using HECRAS and produces water levels up to 1.5 m above the banks. Increasing the depth of the channel is an alternative solution for flooding in this area. The simulation results of the new dimension show no flooding in the area around the channel. The results of this research can contribute to the planning and arrangement of existing canals in Malang City so that they can prevent or reduce flooding that occurs.

Keywords

floods; modeling; watersheds

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References

R. N. Adawiyah, Y. Setiawan, and Y. B. Sulistioadi, “Pemodelan Hidrologi Pada Das Kendilo Di Kabupaten Paser, Provinsi Kalimantan Timur,” J. Teknol. Lingkung., vol. 4, no. 2, pp. 18–23, 2021, doi: http://dx.doi.org/10.30872/jtlunmul.v4i2.5223.

N. I. Rumagit, J. I. Kalangi, and F. B. Saroinsong, “Lolosan Tajuk, Aliran Batang Dan Intersepsi Pada Pohon Pakoba (Syzigium sp.) Nantu (Palaquium obtusifolium Burck) Dan Cempaka (Magnolia tsiampacca),” EUGENIA, vol. 25, no. 2, Nov. 2020, doi: 10.35791/eug.25.2.2019.31398.

D. N. Khaerudin, P. Dinar, and A. Apriliyanti, “Pengaruh Pengembangan Penggunaan Lahan terhadap Pola Curah Hujan di Kota Malang,” Media Tek. Sipil, vol. 18, no. 1, pp. 9–15, 2020, doi: https://doi.org/10.22219/jmts.v18i1.11859.

S. Kinanthi, M. Bisri, and J. S. Fidari, “Analisis Potensi Kerugian Genangan Menggunakan SWMM 5.2 di Kelurahan Purwantoro, Kota Malang,” J. Teknol. dan Rekayasa…, vol. 03, no. 02, pp. 451–461, 2023, doi: https://doi.org/10.22219/jmts.v18i1.11859.

M. Efendi, A. C. Harifa, and S. Sutikno, “Capacity and Perfomance Evaluation of Drainage Channel (Case Study on Letjen Sutoyo Street Malang City),” Reka Buana J. Ilm. Tek. Sipil dan Tek. Kim., vol. 7, no. 1, pp. 41–62, 2022, doi: 10.33366/rekabuana.v7i1.2807.

I. W. Sutapa, “Kajian Hidrograf Satuan Sintetik Nakayasu Untuk Perhitungan Debit Banjir Rancangan Di Daerah Aliran Sungai Kodina,” Maj. Ilm. Mektek, vol. 7, pp. 35–40, 2005.

I. Syahputra and C. Rahmawati, “Aplikasi Program HEC-RAS 5.0.3 Pada Studi Penanganan Banjir,” Elkawnie, vol. 4, no. 2, 2018, doi: 10.22373/ekw.v4i2.3509.

M. R. Wijayanto and N. Helda, “Aplikasi Program HEC-RAS 5.0.7 untuk Pemodelan Banjir di Sub-sub DAS Martapura Kabupaten Banjar,” J. Serambi Eng., vol. 7, no. 4, pp. 3868–3880, Oct. 2022, doi: 10.32672/jse.v7i4.4799.

E. Q. Ajr and F. Dwirani, “Menentukan Stasiun Hujan Dan Curah Hujan Dengan Metode Polygon Thiessen Daerah Kabupaten Lebak,” Jurnalis, vol. 2, no. 2, pp. 139–146, 2019.

K. Christian, D. Yudianto, and S. R. Rusli, “Analisis Pola Distribusi Hujan Terhadap Perhitungan Debit Banjir Das Cikapundung Hulu,” J. Tek. Sumber Daya Air, vol. 3, no. 3, pp. 153–160, 2017.

D. S. Krisnayanti, E. Hunggurami, R. S. Heo, P. N. Tenggara, D. Banjir, and B. Raknamo, “Perbandingan Debit Banjir Rancangan Dengan Metode Hss Nakayasu, Gama I Dan Limantara Pada Das Raknamo,” J. Tek. Sipil, vol. 9, no. 1, pp. 1–14, 2020.

A. Aprizal and A. Meris, “Aplikasi Hec-Ras Dalam Pengendalian Banjir Sungai Way Kandis - Lampung Selatan,” J. Tek. Sipil ITP, vol. 7, no. 1, pp. 1–9, 2020, doi: 10.21063/jts.2019.v701.01.

R. Wigati and S. Soedarsono, “Analisis Banjir Menggunakan Software HEC-RAS 4.1.0 (Studi Kasus Sub DAS Ciberang HM 0+00 - HM 34+00),” Fondasi J. Tek. Sipil, vol. 5, no. 2, pp. 51–61, 2016, doi: 10.36055/jft.v5i2.1261.

DOI: https://doi.org/10.33366/rekabuana.v8i2.5075

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