Evaluation and Revitalization of the Drainage System at the Ngabul Intersection in Tahunan District, Jepara Regency

Authors

  • Daviq Ma’al Abror Department of Civil Engineering, Faculty of Science and Technology, University Islamic of Nahdlatul Ulama, No. 09 Taman Siswa Street, Pekeng, Tahunan , Jepara, 59427, Indonesia Author
  • Decky Rochmanto Department of Civil Engineering, Faculty of Science and Technology, University Islamic of Nahdlatul Ulama, No. 09 Taman Siswa Street, Pekeng, Tahunan , Jepara, 59427, Indonesia Author
  • Ika Revalia Citra Department of Civil Engineering, Faculty of Science and Technology, University Islamic of Nahdlatul Ulama, No. 09 Taman Siswa Street, Pekeng, Tahunan , Jepara, 59427, Indonesia Author
  • Khotibul Umam Department of Civil Engineering, Faculty of Science and Technology, University Islamic of Nahdlatul Ulama, No. 09 Taman Siswa Street, Pekeng, Tahunan , Jepara, 59427, Indonesia Author

Keywords:

Drainage system, flood control, hydrological analysis, hydraulic analysis, U-ditch design

Abstract

This study aims to evaluate and redesign the drainage system at the Ngabul intersection area in Tahunan District, Jepara, which frequently experiences flooding during periods of intense rainfall. The increasing traffic activity and inadequate drainage capacity have contributed to recurring inundation that disrupts transportation activities and reduces road service performance. This study employed field surveys, hydrological analysis, hydraulic analysis, and numerical simulation using the HEC‑RAS software to evaluate the existing drainage condition and determine an appropriate drainage redesign. Primary data included field observations, channel geometry measurements, and elevation surveys, while secondary data consisted of rainfall data collected over a 10-year period. Hydrological analysis was conducted using the Log Pearson Type III distribution method to estimate design rainfall intensity and flood discharge. The results showed that the existing drainage channels had an average discharge capacity of 4.98 m³/s, while the maximum discharge obtained from the HEC-RAS simulation reached 10.84 m³/s, indicating that the existing drainage system was unable to accommodate future runoff discharge. Therefore, a redesigned drainage channel using a rectangular U-ditch section with dimensions of 1.6 m width and 2.0 m depth was proposed as an effective solution to reduce flooding in the study area. The proposed drainage improvement is expected to enhance flood control performance, improve road functionality, and support safer transportation conditions in the Ngabul intersection area.

References

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Published

2026-05-25

Issue

Vol. 1 No. 01 (2026): Journal of Civil Engineering Science

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Creative Commons License

Journal of Civil Engineering Science is Licensed under  a Creative Commons Attribution 4.0 International License.

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