Abstract
The analysis of the impact of pier backwaters is very important in bridge design. The composition of the bed sand across the river, the shape of the pier, the hydraulic gradient of the channel, and the water resistance of the pier all have an impact on the water level backwater height and backwater distance. Considering the actual situation of the project, the influence of piers on flood discharge is analysed and calculated by different backwater empirical formulas. The results show that the calculation results of the formulas are not far apart. Considering the most unfavourable situation, the calculation results of Cao Ruizhang formula of the Chinese Academy of Railway Sciences are selected as the final results. Combined with the analysis of water resistance, the construction of the project has little impact on the flood discharge of the river.
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