Volume 5, Issue 1, March 2019, Page: 22-28
Hydrological Risk Assessment of Gibe III Dam by Using L-Moment
Sintayehu Yadete Tola, Water Supply and Environmental Engineering, Arba Minch Water Technology Institute, Arba Minch University, Arba Minch, Ethiopia
Abdella Kemal, Arba Minch Water Technology Institute, Arba Minch University, Arba Minch, Ethiopia
Daniel Reddythota, Water Supply and Environmental Engineering, Arba Minch Water Technology Institute, Arba Minch University, Arba Minch, Ethiopia
Received: Jan. 22, 2019;       Accepted: Mar. 7, 2019;       Published: Apr. 8, 2019
DOI: 10.11648/j.ajwse.20190501.14      View  585      Downloads  132
A hydrological analysis for assessing the risk of dam overtopping is required for both dam designing and dam safety checking. There is enormous amount of water to be stored in the reservoir to provide valuable service such as hydroelectric power generation and flood control. However dams can cause catastrophic damage to both life and property if they experience performance failures due to overtopping and inadequate spillway design. The hydrological risk was computed from historical peak flow data of Gilgel Gibe near Abelti, Gojeb near Shebe and Wabi near Wolkite, of major rivers flowing towards Gibe III Dam, respectively. From the flood statistics of rivers, the general extreme value (GEV) distribution was fitted to peak flow using L-moment. In this research made an attempt, the extreme event or probability of maximum discharge occurrence at dam site analyzed by associating peak occurrence with the service life of Dam and estimated the hydrological risk at Gibe III Dam. It finds PWM method is very suitable for three river flow condition flowing toward Gibe III Dam. The hydrological risk at Gibe III predicted for 50, 100 and 150 years with respect of Discharge range of 2730m3/s to 3180m3/s was observed there is a risk decreases as return period increases.
L-moment, Gibe III Dam, Hydrological Risk Assessment, General Extreme Value
To cite this article
Sintayehu Yadete Tola, Abdella Kemal, Daniel Reddythota, Hydrological Risk Assessment of Gibe III Dam by Using L-Moment, American Journal of Water Science and Engineering. Vol. 5, No. 1, 2019, pp. 22-28. doi: 10.11648/j.ajwse.20190501.14
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