Supplementary Material, Appendix 0 – A0.33

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?

Solution:

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)D²= 2 * 0.7854 * 0.3² = 0.1414 m³/s, and ΔH = 0.0689m, the Hazen-William roughness coefficient C = 134.15.

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