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Research Article |

Structural Performance Evaluation of Diversion Weir Structure: Case Study of Basaka Small Scale Irrigation Scheme, Oromia, Ethiopia

Diversion weir structures are constructed to withdraw a portion of the stream flow to meet the different water demands to the required place and quantity. These structures, though physically seem small pieces of engineering work, the consideration for structural analysis makes their design complex. Primary data included field observations and measurements, while secondary data included design documentation. In the design, the summation of vertical forces (shear resistance) was more than the summation of horizontal forces (Fh) in the dynamic and static case in the Basaka diversion weir. For this reason, the factor of safety against sliding was determined to be 5.9 and 4.3 respectively which is greater than the optional value (i.e.1). In the design, the resisting moment (Mr) is greater than that of the destabilizing moment (Md) in the dynamic and static case in the Basaka diversion weir. For this reason, the factor of safety against overturning was determined to be 2.5 and 2.1 respectively which is greater than the optional value (i.e.2); this indicates that the weir was safe against overturning. Basaka diversion weir was checked for stability against overstressing for dynamic and static conditions on the site at the time of the study is 0.34 and 0.29 respectively; the result indicates that the structure was safe against tension for the selected condition which is greater than the optional value (i.e. B/6) at designed bottom width. Performance evaluation revealed that the designed weir cross-section of Basaka was accommodating peak flood. In general, the constructed weir has no more engineering design problems that cause low performance but with a lack of well scheme administration, the major problems occurred as field observation results indicate.

Overturning, Performance Indicators, Sliding, Tension, Weir

APA Style

Mosisa, G. (2024). Structural Performance Evaluation of Diversion Weir Structure: Case Study of Basaka Small Scale Irrigation Scheme, Oromia, Ethiopia. American Journal of Civil Engineering, 12(1), 27-31. https://doi.org/10.11648/j.ajce.20241201.14

ACS Style

Mosisa, G. Structural Performance Evaluation of Diversion Weir Structure: Case Study of Basaka Small Scale Irrigation Scheme, Oromia, Ethiopia. Am. J. Civ. Eng. 2024, 12(1), 27-31. doi: 10.11648/j.ajce.20241201.14

AMA Style

Mosisa G. Structural Performance Evaluation of Diversion Weir Structure: Case Study of Basaka Small Scale Irrigation Scheme, Oromia, Ethiopia. Am J Civ Eng. 2024;12(1):27-31. doi: 10.11648/j.ajce.20241201.14

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