Assessment of River Bank Overtopping the Problem Using HEC-RAS (in the case of Sedie River, Abbay Basin, Ethiopia)

Gashu, Melaku Wendachew; Sintayehu, Gashaw; Belayneh, Alemshet; Munye, Kefale

doi:10.1007/s41101-023-00197-w

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…Relying only on structural changes is ineffective in managing reoccurring flood hazards [8]. In order to protect both people's lives and crucial infrastructure the incorporation of flood hazard mapping becomes essential as a non-structural measure [9,10]. Initially the flood frequency analysis was conducted to estimate extreme flows for different return periods (2,5,10,25,50, and 100 years), employing the Log Normal (LN), Log Pearson III (LP3) and Generalized Extreme Value (GEV) distribution.…”

Section: Introductionmentioning

confidence: 99%

“…In order to protect both people's lives and crucial infrastructure the incorporation of flood hazard mapping becomes essential as a non-structural measure [9,10]. Initially the flood frequency analysis was conducted to estimate extreme flows for different return periods (2,5,10,25,50, and 100 years), employing the Log Normal (LN), Log Pearson III (LP3) and Generalized Extreme Value (GEV) distribution. The Easy Fit (5.6) software was used to determine the optimal flood distribution model for calculating peak discharges over different annual recurrence intervals (ARI).…”

Section: Introductionmentioning

confidence: 99%

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Advanced floodplain mapping: HEC-RAS and ArcGIS pro application on Swat River

Ullah,

Qureshi,

Rauf

et al. 2024

J. Umm Al-Qura Univ. Eng.Archit.

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Floods stand out as one of the most devastating environmental threats worldwide resulting in the tragic loss of human lives and significant damage to our essential infrastructure. This study focuses on creating floodplain maps for the two important reaches of Swat River in the Khyber Pakhtunkhwa Province of Pakistan, namely, Kalam–Khwazakhela and Khwazakhela–Chakdara reaches. The Advanced Land Observing Satellite Phased Array Type L-band Synthetic Aperture Radar (ALOS PALSAR) 12.5 m Digital Elevation Model (DEM) data has been used for this purpose. Furthermore, the sensitivity of the flood model was assessed for the Flood 2022 event, considering simulated flood depth, extent, and velocity in relation to various terrains derived from the 12.5-m ALOS PALSAR data. To estimate extreme flows for different return periods (2, 5, 10, 25, 50, and 100 years), the Log Normal (LN), Log Pearson III (LP3), and Generalized Extreme Value (GEV) distributions were employed for the frequency analysis. The GEV distribution turned out to be the best fit for modeling the Swat River for both the Chakdara and Khwazakhela gauge stations. To predict flood levels for the peak floods identified through frequency analysis and for the specific return periods the Hydrologic Engineering Center's River Analysis System (HEC-RAS) 2D simulations were performed. Subsequently the outcomes of this model were used to create floodplain maps using Geographic Information System Professional (ArcGIS Pro) software customized for various return periods. The analysis revealed a linear increase in flood inundation area with longer return periods. The floodplain maps developed hold significant importance for the governing authorities of the Swat region. These maps serve as essential tools for implementing proactive measures against potential infrastructure damage, thereby protecting against economic losses and enhancing public safety. This research effectively combines hydrological modeling and geospatial technology offering practical solutions for managing flood risks. It serves as a valuable guide for making well-informed decisions and promoting sustainable development in flood-prone areas.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advanced floodplain mapping: HEC-RAS and ArcGIS pro application on Swat River

Ullah,

Qureshi,

Rauf

et al. 2024

J. Umm Al-Qura Univ. Eng.Archit.

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Remote sensing in hydrology: A systematic review of its applications in the Upper Blue Nile Basin, Ethiopia

Mekonnen,

Alamirew,

Chukalla

et al. 2025

HydroResearch

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Flood Analysis on Lake Tempe, South Sulawesi

Cahyono,

Juliastuti,

Setyandito

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Tempe Lake is one of the largest lakes in Wajo, Sopen, and Siddenreng Rappang in southern Sulawesi. Lake Tempe is the reservoir of his five major rivers: Bilokka, Lidaratangu, Masaka, Siddenreng, Bira and Walane. The lake offers many benefits to the community such as securing water resources, flood control, agriculture, fishing, and tourism. However, approximately 20–40 cm of silt is produced annually. This can cause flooding in the surrounding areas. Therefore, the restoration of Lake Tempe is necessary to mitigate flooding caused by continuous sedimentation. The Department of Public Works and Housing has developed a phased dredging plan to improve the capacity of Lake Tempe. Later, as no disposal sites were available, dredged materials were used to build several artificial islands along the perimeter of the lake. After the reconstruction project was completed, two major floods occurred, overtopping embankments. Therefore, the design analysis of embankments is required. Analysis indicates that two flood events occur, with a 20-year return period flood and a 50-year return period flood at elevations of 8.36 m and 9.2 m. From hydraulic analysis it is found that flood embankment height of 10 m is overtopped by water level of total 9.56 m and 10.4 m respectively because of wave run up. For a 20-year return period, there is an indication that slope stability and settlement problems affect flood events. It can be concluded that flood problems occur because of extreme events and the failure of flood embankments due to overtopping.

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Assessment of River Bank Overtopping the Problem Using HEC-RAS (in the case of Sedie River, Abbay Basin, Ethiopia)

Cited by 3 publications

References 8 publications

Advanced floodplain mapping: HEC-RAS and ArcGIS pro application on Swat River

Advanced floodplain mapping: HEC-RAS and ArcGIS pro application on Swat River

Remote sensing in hydrology: A systematic review of its applications in the Upper Blue Nile Basin, Ethiopia

Flood Analysis on Lake Tempe, South Sulawesi

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