Articles | Volume 387
https://doi.org/10.5194/piahs-387-65-2024
https://doi.org/10.5194/piahs-387-65-2024
Post-conference publication
 | 
18 Nov 2024
Post-conference publication |  | 18 Nov 2024

Backwater effect in lowland regions due to bridge structure: a case study of Shreekhandapur, Kavre, Nepal

Rizbi Buddhacharya, Sailesh Maharjan, Rupesh Choudhary, Shyam Sundar Khadka, and Santosh Chaudhary

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Proc. IAHS, 387, 87–93, https://doi.org/10.5194/piahs-387-87-2024,https://doi.org/10.5194/piahs-387-87-2024, 2024
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Cited articles

Costabile, P., Macchione, F., Natale, L., and Petaccia, G.: Comparison of scenarios with and without bridges and analysis of backwater effect in 1-D and 2-D river flood modeling, CMES-Comp. Model. Eng., 109–110, 81–103, 2015. 
EmDAT: The CRED/OFDA International disaster Database, https://www.emdat.be/ (last access: 3 October 2023), 2019.  
Shakya, D. M.: Guidelines on Hydrologic and Hydraulic Analysis and River Training Works for Bridge Design, Department of Roads, https://dor.gov.np/uploads/publication/publication_1642584636.pdf (last access: 13 October 2023), 2022. 
Shamkhi, M. S. and Salim, M.: Experimental study of the effect of contraction ratio on backwater by using bridge pier as flow obstruction, 3rd International Energy & Engineering Congress Proceedings Book, https://www.researchgate.net/publication/328723349_EXPERIMENTALL_STUDY_OF_THE_EFFECT_OF_CONTRACTION_RATIO_ON_BACKWATER_BY_USING_BRIDGE_PIER_AS_FLOW_OBSTRUCTION (last access: 13 October 2023), 2018. 
Sharma, T. P., Zhang, J., Koju, U. A., Zhang, S., Bai, Y., and Suwal, M. K.: Review of flood disaster studies in Nepal: A remote sensing perspective, Int. J. Disast. Risk Re., 34, 18–27, 2019. 
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Our study examined the backwater effect due to bridge piers in lowland areas. The results showed that replacing the old bridge with a new design featuring fewer and narrower piers, along with a higher deck level, reduced the backwater effect and flood levels. Also, using a 3 m floodwall upstream further decreased inundated area by over 50 %. These findings highlight the consideration of environmental factors in bridge design to mitigate flood risks.