APPENDIX E – Air-Water Interface
Surge Analysis and the Wave Plan Method
Supplementary Material: Example Problems and Solutions
Appendix E – Problem 5
E.5 A long bulk-water gravity pipeline that brings water to your utility’s treatment plant has gradually lost its design flow carrying capacity (of 5.5 m3/s) by nearly 35%. After reading Chapter 6 and Appendix E, more specifically Sections 6.5.2 Automatic Air Valves, E.8 Transport of Air, and Figure E.14, you are convinced that some of the air valves are not working the way they were intended to. You took a walk along the pipeline, visually inspecting each air valve. You noticed that except for a handful, almost all of the 50 air valves on the pipeline were wet and were dripping or squirting tiny jets of water. Which of the air valves would you examine closely (isolating and physically examine for blockages), the handful of air valves that are totally dry or the rest that are wet and dripping? Explain why.
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