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All Journal Journal of Science and Engineering Portal: Jurnal Teknik Sipil Jurnal Abdimas Kartika Wijayakusuma
Nabila Islamaiya Alhadar
Universitas Khairun
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Journal : Journal of Science and Engineering

 1 
Identification of Drainage System Capacity using EPA-SWMM 5.2 Version Modeling in Bastiong Karance, Ternate City Alhadar, Nabila Islamaiya; Yakan, Annisa Fathi
Journal of Science and Engineering Vol 8, No 2 (2025): Journal of Science and Engineering (Josae)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v8i2.10743

Abstract

Flooding and waterlogging in Bastiong Karance, Ternate City, are recurring problems during heavy rainfall, primarily due to insufficient drainage capacity and high impervious land use. This study evaluates the performance of the existing drainage system through hydrological and hydraulic modeling using EPA-SWMM 5.2. Ten years of maximum daily rainfall data (2014–2024) were analyzed with Gumbel and Log Pearson Type III distributions to estimate design rainfall, while the Mononobe method was used to derive intensity-duration-frequency (IDF) curves. Field surveys provided drainage geometry, and topography data were obtained from Global Mapper. The study area was divided into seven Sub-Catchments, 13 junctions, 14 conduits, and two outfalls. Simulation results indicated that node JN3 experienced localized flooding for 0.09 hours with a peak discharge of 0.296 m³/s and total volume of 0.055×10⁶ liters. Conduits CN2, CN3, CN8, and CN12 experienced surcharge with exceedance durations of 0.01–0.26 hours. These findings highlight the limitations of the current drainage system in accommodating runoff during a 10-year return period storm. Recommended measures include widening critical conduits, constructing retention ponds, and implementing infiltration-based runoff reduction strategies to mitigate future flood risk.
Spatial Transformation in Central Weda Industrial Expansion, Land-Use Change, and Settlement Dynamics in Indonesia’s Nickel Frontier Alhadar, Nabila Islamaiya; Husni, Ibrahim; Ariyanto, Ariyanto; Musa, Abdul Haris
Journal of Science and Engineering Vol 8, No 2 (2025): Journal of Science and Engineering (Josae)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v8i2.10754

Abstract

The Indonesia Weda Bay Industrial Park (IWIP) has rapidly transformed Central Weda District’s spatial structure between 2012 and 2022. This paper integrates satellite-based land-use change analysis, regional statistics, spatial plan (RTRW/RDTR) review, field survey summaries, and carrying-capacity computations to evaluate the impacts of industrial agglomeration on land conversion, housing pressure, tenure dynamics, and ecological buffer integrity. Results (from local datasets) show settlements increased from 39.3 ha (2012) to 82.2 ha (2022), while industrial area expanded to 16,000 ha. Industrial employment rose from 650 (2018) to 29,800 (2022), fueling a nearly 400% increase in local land prices (e.g., Lelilef Sawai: IDR 50,000/m² - IDR 277,000/m²). Carrying capacity calculations indicate most villages retain DDPm 1 (sufficient capacity) except Lelilef Sawai (DDPm 1), which already exceeds sustainable settlement thresholds. The paper concludes with policy recommendations for zoning enforcement, ecological buffer protection, worker housing programs, and integrated industrial-regional planning.
Co-Authors Ariyanto Ariyanto Dewi Amelia, Dewi Husni, Ibrahim Marsaoly, Nurmaiyasa Misbah, Zulkarnain K. Mufti Amir Sultan, Mufti Amir Musa, Abdul Haris Rauf, Ichsan Shandy, Sary Syaibani, Ahmad Zakky Yakan, Annisa Fathi