APPENDIX 0 – Pre-requisite: Steady State Hydraulics
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Surge Analysis and the Wave Plan Method
Supplementary Material: Example Problems and Solutions
Appendix 0 – Problem 33
A0.33 What is the equivalent Hazen-William roughness coefficient for the pipeline described in the previous question for the same flow conditions?
The SI units version of Hazen-William empirical equation for friction headloss in a pipe section is:
ΔH = (10.67 L Q 1.852 )/(C 1.852 D 4.87 ), where L is length of pipe section, Q is flowrate, C is Hazen-William roughness coefficient, and D is pipe internal diameter; all parameters in standard SI units.
For L = 1000m, D = 0.3m, and Q = V (π/4)D 2 = 2 * 0.7854 * 0.3 2 = 0.1414 m 3 /s, and ΔH = 0.0689m, the Hazen-William roughness coefficient C = 134.15.
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