Dam breach analysis of Kibimba Dam in Uganda using HEC-RAS and HEC-GeoRAS

Environmental Systems Research

Research

Cyrus Chelangat¹  Joel Webster Mbujje²  Hosea Eridadi Mutanda³  Ambrose Mubialiwo⁴  Ayubu Mugisha⁵  Francis Joel Lay⁵  Moses Kiwanuka⁶ 

[1] Department of Civil Engineering, Ndejje University, P.O Box 7088, Kampala, Uganda;Department of Civil and Environmental Engineering, Kyambogo University, P.O. Box 1, Kyambogo, Uganda;Department of Civil Engineering, Soroti University, P.O. Box 211, Soroti, Uganda;Department of Civil and Building Engineering, Mbarara University of Science and Technology, P.O. Box 1410, Mbarara, Uganda;Department of Civil and Environmental Engineering, Kyambogo University, P.O. Box 1, Kyambogo, Uganda;Department of Earth and Environment, Florida International University, 11200 SW 8th St, 33199, Miami, FL, USA;Department of Earth and Environment, Florida International University, 11200 SW 8th St, 33199, Miami, FL, USA;Department of Civil Engineering, Ndejje University, P.O Box 7088, Kampala, Uganda;

关键词: Dam breach;    HEC-RAS;    HEC-GeoRAS;    Kibimba;   

DOI  :  10.1186/s40068-023-00317-4

 received in 2023-07-30, accepted in 2023-09-29,  发布年份 2023

来源: Springer

【 摘 要 】

Dam failures have severe consequences on human life and property. In the case of an earth filled Kibimba Dam located in Eastern Uganda, the occurrence of a flood equal to or larger than the probable maximum food (PMF) could result in catastrophic economic losses including loss of human life. This study utilized the USACE Hydrologic Engineering Center's River Analysis System (HEC-RAS) and Hydrologic Engineering Center’s Geographic River Analysis System (HEC-GeoRAS) to analyze the potential dam break of Kibimba Dam, considering overtopping and piping failure scenarios. The results of the analysis revealed that the spillway of Kibimba Dam possesses sufficient capacity to safely discharge a flood resulting from a probable maximum flood peak of 400 m3/s. Therefore, the dam is not susceptible to breach under the overtopping failure mode. However, the dam failed under the piping failure mode. To assess the downstream impact of the dam break, the breach hydrographs resulting from piping failure were examined. Consequently, the study investigated the effects of flood propagation downstream of the dam. This resulted in varying inundation depths of up to 6 m and velocities ranging from 1.2 to 10 m/s. These findings highlight the devastating consequences of Kibimba Dam's failure, particularly affecting rice field plantations, infrastructure, and other economic activities in the downstream area. Therefore, the outcomes of this study are crucial for the development of Emergency Action Plans that incorporate dam breach and flood routing analyses specific to the affected downstream regions.

【 授权许可】

CC BY   
© Springer-Verlag GmbH Germany, part of Springer Nature 2023

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