An Assessment of the Factors Affecting Flood Peak Discharge Reduction Due to the Retarding Basin
Received: 28 July 2025 | Revised: 24 August 2025 | Accepted: 7 September 2025 | Online: 13 November 2025
Corresponding author: Lily Montarcih Limantara
Abstract
This research assesses the variables influencing flood reduction. The land use changes occur due to the residential demand and all supporting infrastructures and facilities. It is related to population increase, raising surface run-off and then resulting in flooding. The proposed methodology involves simulating various placements of retarding basins (RAk) and different maximum storage capacities (Vk) for several flood return periods (QT). This research is conducted in the urban agglomeration area of Wonosari, Gunungkidul Regency, Daerah Istimewa Yogyakarta-Indonesia. The results show that the variable representing the maximum capacity of retarding basin (Vk) has a logarithmic relationship with the response of ΔQp, with a correlation value (R) of 0.7894 and an adjusted determination coefficient (adjusted R2) of 0.6207. In addition, the variable of the controlled watershed area ratio (RAK) has linear, quadratic, cubic, and quartic relations with ΔQp, with the average correlation value being 0.4563 and the average adjusted determination coefficient (average adjusted R2) being 0.2032. However, the variable of design flood for the T year-return-period (QT) has the logarithmic correlation, with a correlation value (R) of 0.3987 and an adjusted determination coefficient (adjusted R2) of 0.1536. Finally, the three variables of Vk, RAk, QT have a multiple linear relationship with ΔQp, with the correlation value (R) being 0.7894 and the adjusted determination coefficient (adjusted R2) being 0.6207. These results are essential to support the reduction of flood peak discharge modeling.
Keywords:
influenced variable, evaluation, flood reduction, retarding basinDownloads
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Copyright (c) 2025 Hari Yuwono, Lily Montarcih Limantara, Moh. Sholichin, Hari Siswoyo
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