Proceedings of the 3rd International Conference on Science in Engineering and Technology (ICOSIET 2024)

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Effective Rainfall Analysis Using the Phi Index Method In the Bangga Watershed

Authors
V. W. Andiese1, *, I W. Sutapa1, N. B. Rustiati1
1Civil Engineering Department, Faculty of Engineering, Tadulako University, Palu, Indonesia
*Corresponding author. Email: verawimandiese@gmail.com
Corresponding Author
V. W. Andiese
Available Online 7 July 2025.
DOI
10.2991/978-94-6463-768-7_18How to use a DOI?
Keywords
Effective Rain; Phi Index; Bangga Watershed; rainfall
Abstract

The Bangga watershed is one of the watersheds located in Sigi Regency, Central Sulawesi Province, with an area of 61.05 km2 and a river length of 20.7 km. In recent years, the Bangga watershed has often experienced flash floods and landslides, causing much damage to settlements, plantations, and other facilities. Changes in land use and the earthquake disaster that occurred in 2018 are thought to be the causes of the current condition of the Bangga watershed. This research aims to analyze the amount of effective rainfall using the Phi Index method. Effective rainfall is the total rain that falls minus the water loss. The Phi index is the evenly distributed loss intensity, which will be subtracted from the rain intensity to obtain the amount of effective rainfall. The rain hyetograph designed in this research uses the Mononobe Method. This research uses secondary data, namely rainfall data from the Bangga Atas and Bangga Bawah stations and automatic Water Level Recorder (AWLR) data from the Bangga River in 2018-2021. The analysis found that the maximum effective rainfall occurred in February 2018 at 56.63 mm, and the minimum in December 2020 was 1.77 mm. Changes in land use and rainfall in the watershed will affect the amount of effective rainfall.

Copyright
© 2025 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title
Proceedings of the 3rd International Conference on Science in Engineering and Technology (ICOSIET 2024)
Series
Advances in Engineering Research
Publication Date
7 July 2025
ISBN
978-94-6463-768-7
ISSN
2352-5401
DOI
10.2991/978-94-6463-768-7_18How to use a DOI?
Copyright
© 2025 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

risenwbib
TY  - CONF
AU  - V. W. Andiese
AU  - I W. Sutapa
AU  - N. B. Rustiati
PY  - 2025
DA  - 2025/07/07
TI  - Effective Rainfall Analysis Using the Phi Index Method In the Bangga Watershed
BT  - Proceedings of the 3rd International Conference on Science in Engineering and Technology (ICOSIET 2024)
PB  - Atlantis Press
SP  - 161
EP  - 170
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-768-7_18
DO  - 10.2991/978-94-6463-768-7_18
ID  - Andiese2025
ER  -