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Journal : Civil Engineering Journal

A Model for the Reduction of Flood Peak Discharge (ΔQp) Due to the Retarding Basin Yuwono, Hari; Limantara, Lily M.; Sholichin, Moh.; Siswoyo, Hari
Civil Engineering Journal Vol. 11 No. 12 (2025): December
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-12-012

Abstract

This research aims to develop a model for flood peak discharge reduction (ΔQp) through the placement of retarding basins within a watershed system, represented by the area ratio of the controlled watershed (RAk) and the maximum storage capacity of the retarding basin (Vk). The area ratio of the controlled watershed (RAk) is defined as the ratio between the catchment area of the retarding basin and the total watershed area (Ak/A). The methodology involves simulating various retarding basin placements (RAk) and different maximum storage capacities (Vk) for several flood return periods (QT). This study was conducted in the urban agglomeration area of Wonosari, Gunungkidul Regency, Special Region of Yogyakarta, Indonesia. The placement and utilization of retarding basins result in varying levels of flood peak discharge reduction (ΔQp) at the downstream control point (Taman Pancuran), depending on the maximum storage capacity of the retarding basin (Vk) and its placement within the watershed (RAk). The resulting empirical equations for flood peak discharge reduction (ΔQp) using the retarding basin method are as follows: ΔQp = 0.105654 − 0.014593 Vk − 0.029251 RAk + 0.011089 QT for Vk values in the range (V1–V4) = 36.4–208.8 × 10³ m³, and ΔQp = 1.374989 − 0.003702 Vk − 0.338381 RAk + 0.004773 QT for Vk values in the range (V4–V200) = 136.2–7039.1 × 10³ m³. An observed anomaly was identified, where ΔQp became positive at small values of Vk and RAk, indicating an increase in peak discharge (Qp).
Co-Authors A.A. Ketut Agung Cahyawan W Agi Putra Kharisma, Agi Putra Amrul, Muhammad Alfarisy Andono, Rizky Harsya Andre Primantyo H., Andre Primantyo Arief Andy Soebroto Arif Rahmad Darmawan AS Dwi Saptati Nur Hidayati, AS Dwi Saptati Nur Ayisya Cindy Harifa Bambang Ismuyanto Cahyani, Sylvia Regita Dedy Febrianto Nadjamuddin, Dedy Febrianto Dian Sisinggih Diana, Eka Wahyu Donny Harisuseno Emma Yuliani Endang Purwati RN Evi Nur Cahya Fahmi Zamroni, Fahmi Felani, Gita Fitri Ferina, Marisa Ayu hari siswoyo Harri Pranowo Indrajayatama, Ridho Satria Ireldi Pratama, Faris Ismuyanto , Bambang Kurnianto, Noval Irfan Kurniawan, Dita Cahya Leo Arbi Wibowo Lily Montarcih Limantara Limantara, Lily M. M. Bisri Majid, Haidar Naufal Mandasari, Fetri Maulana, Firhand Mohammad Rahdiansyah Batubara, Mohammad Rahdiansyah Montarcih Limantara, Lily Muhtasar, Iqbal Maulana Nathania, Nadya Ayu Nugraha, Aldi Nugroho, Faishal Dary Nurul Hidayat Palupi, Gema Anggun Pane, Yasmin Pebriani Sitorus Pitojo Tri Juwono Putri, Dea Anggara Putu Ratih Wijayanti Qadri S, Wahyuddin Rahadjeng, Aira Azzahra Rahayu, Gayatri Putri Rares, Johan Peter Rini Wahyu Sayekti Rispiningtati Rispiningtati Riyanto Haribowo Rohmaningsih, Elin Runi Asmaranto Saptati N. H., A. S. Dwi Sari, Chudiana Mega Simanjuntak, Yogi Ricardo P Sinantrya, Mutiara Sri Wahyuni Susilo, H. Suwanto Marsudi Tri Budi Prayogo, Tri Budi Ussy Andawayanti Very Dermawan Wahlul Sodikin Wahyu Nafier A. Wayan Firdaus Mahmudy Widandi Soetopo yuriski, ryan isra' Yuwono, Hari