Analisis Banjir pada Sungai Bendomongal di Kabupaten Kediri

Rabbani, Zidan Akmal (2026) Analisis Banjir pada Sungai Bendomongal di Kabupaten Kediri. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sungai Bendomongal di Desa Tiron, Kabupaten Kediri, mengalami banjir berulang seiring perubahan tata guna lahan akibat pembangunan Bandara Dhoho, Stadion Gelora Daha Jayati, dan Jalan Tol Kediri–Tulungagung, tanpa evaluasi teknis kapasitas alurnya. Penelitian ini bertujuan menghitung tinggi hujan dan debit banjir rencana, mengevaluasi kapasitas penampang eksisting, serta merencanakan pengendalian banjir. Data hujan harian maksimum tahunan selama 26 tahun (2000–2025) dari lima stasiun diolah dengan Poligon Thiessen. Distribusi Gumbel terpilih melalui uji Chi-Kuadrat dan Smirnov-Kolmogorov, menghasilkan tinggi hujan rencana periode ulang 25 tahun sebesar 126,22 mm. Debit banjir rencana dihitung dengan dua metode, yaitu HSS Nakayasu sebesar 79,89 m³/det dan SCS-CN melalui HEC-HMS sebesar 109,70 m³/det. Karena DAS tidak memiliki stasiun duga air, kedua metode divalidasi terhadap kejadian banjir terdokumentasi 23 Desember 2024 dengan hujan wilayah 107,74 mm. Keduanya konsisten memprediksi luapan sehingga tidak dapat saling mengeliminasi; debit rencana ditetapkan konservatif sebesar Q25 = 79,89 m³/det. Pemodelan HEC-RAS 1D aliran tetap pada 51 penampang menunjukkan 47 penampang tidak mampu mengalirkan debit tersebut. Pengendalian banjir direncanakan pada empat ruas sepanjang 5,8 km, yaitu normalisasi dan perencanaan tanggul serta penambahan sheet pile FCSP 500.220 K-500 pada ruas permukiman padat, dengan tinggi jagaan 0,6 m. Verifikasi ulang menunjukkan seluruh penampang rencana aman terhadap Q25.
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The Bendomongal River in Tiron Village, Kediri Regency, floods repeatedly amid land use change driven by the Dhoho Airport, Gelora Daha Jayati Stadium, and Kediri–Tulungagung Toll Road projects, yet its channel capacity has never been evaluated. This study determines the design rainfall and flood discharge, evaluates existing cross section capacity, and designs flood control measures. Twenty-six years of annual maximum daily rainfall (2000–2025) from five stations were processed using the Thiessen Polygon method. Gumbel was selected through Chi-Square and Smirnov-Kolmogorov tests, yielding a 25-year design rainfall of 126.22 mm. Two methods were applied: the Nakayasu Synthetic Unit Hydrograph (79.89 m³/s) and SCS-CN through HEC-HMS (109.70 m³/s). As the watershed is ungauged, both were validated against the documented 23 December 2024 flood (areal rainfall 107.74 mm). Both consistently predicted overtopping and could not eliminate one another, so the design discharge was conservatively set at Q25 = 79,89 m³/s. Steady flow HEC-RAS 1D modelling of 51 cross sections showed 47 unable to convey this discharge. Flood control was designed along four reaches over 5.8 km with normalization and leeve reinforced by FCSP 500.220 K-500 sheet piles through densely settled reaches, with 0.6 m freeboard. Verification confirmed all designed sections are safe against Q25.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Analisis Banjir, HEC-HMS, HEC-RAS, HSS Nakayasu, Pengendalian Banjir, Sungai Bendomongal, Bendomongal River, Flood Analysis, Flood Control, HEC-HMS, HEC-RAS, Nakayasu SUH
Subjects:	G Geography. Anthropology. Recreation > G Geography (General) > G70.212 ArcGIS. Geographic information systems. G Geography. Anthropology. Recreation > GB Physical geography > GB1399.9 Floods T Technology > TC Hydraulic engineering. Ocean engineering > TC530 Flood control
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	Zidan Akmal Rabbani
Date Deposited:	29 Jul 2026 02:13
Last Modified:	29 Jul 2026 02:13
URI:	http://repository.its.ac.id/id/eprint/137057

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