Both calculations are in good agreement. Since data interpolation is more accurate than correlation, the values calculated by interpolation will be used in the design.
To calculate a column diameter, the column will be designed for 75 percent of flood as per the criterion in Sec. 8.2.12. In addition, a derating factor of 0.9 will be applied for the calculation as per discus-sion on foaming in Sec. 9.4.2.
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