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All Journal Journal of Advanced Sciences and Mathematics Education
Randy Setiawan
Politeknik Negeri Pontianak, Indonesia
Chemistry Education Mathematics Physics Social Sciences

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Hydrological modelling for urban drainage capacity assessment in a rapidly urbanizing commercial corridor: A case study from Pontianak, Indonesia Ikhwan Arief Purnama; Imanuel Kemenangenta Perangin Angin; Randy Setiawan
Journal of Advanced Sciences and Mathematics Education Vol. 6 No. 3 (2026): Journal of Advanced Sciences and Mathematics Education
Publisher : CV. FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/jasme.v6i3.1384

Abstract

Background: Rapid urbanization has increased impervious surfaces in commercial areas, leading to higher surface runoff and reducing the performance of existing urban drainage systems during intense rainfall events. As a result, many drainage networks are no longer capable of conveying design runoff, increasing the risk of urban inundation and disrupting transportation and commercial activities. Aims: This study aimed to assess the hydraulic capacity of the existing drainage system along Prof. M. Yamin Road, Pontianak, Indonesia, and to develop an optimal drainage design based on hydrological modelling. Methods:  A quantitative approach was employed using field measurements and annual maximum rainfall data collected over a ten-year period (2015–2024). Design rainfall was estimated using the Gumbel frequency distribution, rainfall intensity was calculated using the Mononobe equation, and peak runoff was determined through the Rational Method. The hydraulic performance of the existing drainage channels was subsequently evaluated using Manning's equation by comparing the channel capacity with the estimated design discharge. Results: The estimated design rainfall was 255.13 mm, generating a rainfall intensity of 138.75 mm h⁻¹ and a peak runoff discharge of 1.169 m³ s⁻¹. The drainage channel toward Sutan Syahrir exhibited a capacity of 2.85 m³ s⁻¹ and was hydraulically adequate, whereas the channel toward Kota Baru provided only 0.375 m³ s⁻¹, indicating insufficient capacity to accommodate the design discharge. Conclusion: The integration of hydrological modelling and hydraulic analysis provides a reliable framework for assessing urban drainage capacity and supports evidence-based planning for effective stormwater management in rapidly urbanizing commercial corridors.
Compressive strength performance of sustainable concrete incorporating rice husk ash and sugarcane bagasse ash as agricultural waste-based supplementary cementitious materials Arifurrahman; Agil Dwi Cahyadi; Pramudya Kurniawan; Randy Setiawan; Wattini; Qalbi Hafiyyan
Journal of Advanced Sciences and Mathematics Education Vol. 6 No. 3 (2026): Journal of Advanced Sciences and Mathematics Education
Publisher : CV. FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/jasme.v6i3.1397

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Background: The growing environmental concerns associated with Portland cement production have encouraged the utilization of agricultural waste as supplementary cementitious materials for sustainable concrete. Rice husk ash (RHA) and sugarcane bagasse ash (SCBA) are silica-rich by-products with pozzolanic potential that can reduce cement consumption while promoting environmentally responsible construction. Aim: This study aimed to evaluate the compressive strength performance of sustainable concrete incorporating RHA and SCBA and to determine the most effective mixture proportion for structural concrete applications. Method: A pure experimental approach was employed using concrete with a target compressive strength of 21 MPa at 28 days. RHA was used as a constant 10% cement replacement by weight, while SCBA was incorporated at 1%, 3%, 5%, 7%, and 9% of the binder content. Superplasticizer was added to maintain workability within a slump range of 6–18 cm, and compressive strength was evaluated after 7, 14, and 28 days of curing. Results: Increasing SCBA content progressively reduced compressive strength because of its porous structure and high water demand, which limited cement hydration. The mixture containing 10% RHA and 1% SCBA exhibited the highest compressive strength among the modified concretes, although it remained below the control concrete (25.51 MPa) and the targeted structural strength. Conclusion: RHA and SCBA have potential as agricultural waste-based supplementary cementitious materials for sustainable concrete, particularly for non-structural applications. Further optimization of ash processing and mixture proportions is required to enhance their mechanical performance and broaden their structural applicability. 
Co-Authors Agil Dwi Cahyadi Arifurrahman Hafiyyan, Qalbi Ikhwan Arief Purnama Imanuel Kemenangenta Perangin Angin Pramudya Kurniawan Wattini