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Table 3

Changes of water surface elevation near piers

Shapes of bridge piersThe 10-year cycleAnnual averageLowest water level (P = 95%)
The rectangular pier The maximum water level elevation 27.24 18.71 16.876 
The minimum water level elevation 26.80 18.61 16.866 
The height of backwater 0.44 0.10 0.010 
The round pier The maximum water level elevation 27.16 18.67 16.856 
The minimum water level elevation 26.84 18.60 16.848 
The height of backwater 0.32 0.07 0.008 
The oval pier The maximum water level elevation 27.11 18.624 16.851 
The minimum water level elevation 26.86 18.576 16.846 
The height of backwater 0.25 0.048 0.005 
Shapes of bridge piersThe 10-year cycleAnnual averageLowest water level (P = 95%)
The rectangular pier The maximum water level elevation 27.24 18.71 16.876 
The minimum water level elevation 26.80 18.61 16.866 
The height of backwater 0.44 0.10 0.010 
The round pier The maximum water level elevation 27.16 18.67 16.856 
The minimum water level elevation 26.84 18.60 16.848 
The height of backwater 0.32 0.07 0.008 
The oval pier The maximum water level elevation 27.11 18.624 16.851 
The minimum water level elevation 26.86 18.576 16.846 
The height of backwater 0.25 0.048 0.005 
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