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Umboro Lasminto
Institut Teknologi Sepuluh Nopember
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Journal : agregat

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Analisis Pengaruh Distribusi Hujan Rancangan Terhadap Karakteristik Genangan Pada Sistem Drainase Kalibokor, Kota Surabaya Aulia Putri Yelisa; Umboro Lasminto
AGREGAT Vol 11 No 1 (2026)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v11i1.31645

Abstract

The Kalibokor drainage system in Surabaya is one of the areas frequently affected by inundation during the rainy season, owing to the limited capacity of its channels to accommodate surface runoff. This condition is further aggravated by the high rainfall intensity characteristic of urban areas, which increases runoff discharge and the potential for flooding. Variations in the temporal distribution of design rainfall can produce different hydrological responses within the drainage system, thereby potentially influencing inundation characteristics in terms of flooded area and inundation depth. This study aims to analyze the effect of rainfall distribution design on the inundation area and depth within the Kalibokor drainage system, Surabaya. The method employed is two-dimensional hydraulic modeling using HEC-RAS 2D with a rain-on-grid approach to spatially simulate overland flow and inundation. The model was calibrated against the existing inundation conditions before the simulation. Simulations were carried out using a rainfall design with a 10-year return period and six duration variations ranging from 1 to 6 h. The simulation results indicate that rainfall duration variation affects the inundation characteristics within the study area. The largest inundation area occurred at a rainfall duration of 1 h, covering approximately 6.113 km², while at a duration of 6 hours the inundation area decreased to approximately 5.592 km². The Inundation formed across all scenarios was predominantly characterized by depths of less than 0.10 m, accounting for more than 50% of the total inundation area. The results demonstrate that shorter rainfall durations tend to produce larger and deeper inundation extents, whereas increasing rainfall duration reduces both the inundation area and depth within the Kalibokor drainage system. These findings indicate that rainfall distribution has a significant influence on flood inundation response and should be considered consideration in the evaluation and planning of urban drainage systems to improve channel capacity in conveying stormwater runoff.
Co-Authors Abdus Salam Afkarina Izzati Ahmad Dwi Cahyadi Aisyah Amelia Amrizal Amrizal Anak Agung Ngurah Satria Damarnegara Angela Jasmine Tanya Tjahyana Aninda Rahmaningtyas Anna A Misdanik Anwar, Nadjadji Ardelia Arlimasita Ashilah, Hafizhah Aulia Putri Yelisa Bagas Yoga Pratama Bahmid Tohari Bambang Sarwono Bangun Muljo Soekotjo Bangun Muljo Sukojo, Bangun Muljo Berlian Al Kindhi Brama Lesmono Budi Rahardjo Cahya Buana Catur Arif Prastyanto, Catur Arif Chandra Eko Prasetyo Chandra Murprabowo Mudjib Data Iranata Devy Amalia Dewi, Mega Septia Sarda Dianeka, Belia Tatika Arno Dwi Retnowati Edijatno Edijatno Edijatno Edijatno Edijatno Edijatno Faradilla Ayu Rizki Shiami Farida Rahmawati Gemma Galgani Tunjung Dewandaru Habibur Rohman Hafidh Farisi Hendrata Wibisana Hera Widyastuti I Gede Tunas Irma Noor Fadhilla Istiar Jagad Dhita Kustyaningrum Jagad Dhita Kustyaningrum Lisna Isminingtyas Made Gita Pitaloka Masca Indra Triana Maulana, Mahendra Andiek Mega Septia Sarda Dewi Mohamad Bagus Ansori Mohamad Bagus Ansori Muh. Fikri Ardwian Muhding, Noor Zaqiyah Nastasia F Margini Nastasia Festy Marginia Novi Andriany Teguh Pukan, Mariano Ado Galot Rachmatika Nurita Rafika Nuramalia Riki Chandra Wijaya Riki Chandra Wijaya Risma Lupita Sari Rizaldi Firdaus Ardiyanto Rizky Saputra Rossana Margaret Kadar Yanti Safira Nur Afifah Sari, Putu Tantri Kumala Sarwonno, Bambang Sarwono Sarwono Satria Damar Negara Satria Damar Negara Satria Damarnegara Satria Damarnegara Sharfina Cintantya Purwandani Sintya Maghfira Ismawati Sreenatha G. Anavatti Sukotjo, Bangun Muljo Tjahyana, Angela Jasmine Tanya Wahju Herijanto Wardoyo, Wasis Wijaya, Riki Chandra Yang Ratri Savitri Yang Ratri Savitri Zakiyatun Nafisah Zharin F. Syahdinar