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Estimating Flood Inundation Depth Along the Arterial Road Based on the Rainfall Intensity Cover

Estimating Flood Inundation Depth Along the Arterial Road Based on the Rainfall Intensity

By: Agus Suharyanto  
Open Access
|Jun 2021

Abstract

This study identifies the rainfall intensity that causes the flood along the arterial road connecting Malang to Surabaya, East Java, Indonesia, estimates flood occurrences based on the recorded rainfall data, and proposes the normalization of the side ditch to reduce flood occurrences. The Nakayasu synthetic unit hydrograph was used to analyze the runoff discharge, and the Hydrologic Engineering Center’s River Analysis System software was used to analyze the water level profile of the side ditch. The regression method was used to determine the relationship between the rainfall intensity and inundation depth along the arterial road. Analysis results show that floods occur if the rainfall intensity is ≥1.01 year return period. To estimate the flood inundation depth, simple linear regression was conducted herein. Furthermore, it was observed that flood occurrences can be avoided by normalizing the side ditch cross section with a fully rectangular shape having a channel bottom elevation equal to the existing elevation.

DOI: https://doi.org/10.2478/cee-2021-0008 | Journal eISSN: 2199-6512 | Journal ISSN: 1336-5835
Language: English
Page range: 66 - 81
Published on: Jun 22, 2021
Published by: University of Žilina
In partnership with: Paradigm Publishing Services
Publication frequency: 2 issues per year

© 2021 Agus Suharyanto, published by University of Žilina
This work is licensed under the Creative Commons Attribution 4.0 License.