Chapter 7 – Assumptions and Uncertainties
Surge Analysis and the Wave Plan Method
Supplementary Material: Example Problems and Solutions
Chapter 7 – Problem 7.6
7.6 A pipe roughness calibration exercise was conducted in certain pressure zone of an urban water supply system. Pipes in this pressure zone were grouped based on their average steady state flow velocities, which ranged from 0.1 m/s through 1.5 m/s. The resulting Hazen-William roughness coefficients for 300 mm diameter metallic pipes ranged from 45 to 120 (45 for those with average velocity of 0.1 m/s and 120 for those with average velocity of 1.5 m/s). Compute the corresponding roughness values associated with the Darcy-Weisbach equation [Answers: DW roughness corresponding to HWC of 45 is 83.6 mm and HWC of 120 is 0.3985 mm].
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