HW 5 - AY 2009‐10 CE3132 Water Resources Engineering...

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Unformatted text preview: AY 2009‐10 CE3132 Water Resources Engineering Department of Civil Engineering National University of Singapore Homework No.5 Questions #2 and #4 to be discussed Questions #1 and #3 to be submitted on 12th Mar 2010 To minimize distractions to the researchers in E1‐08‐22, please submit your homework to the box OUTSIDE E1‐08‐22. 1 Research the water distribution system component assigned to your team. Write a 1‐page summary, including figure(s), of the information you collect. You may wish to discuss its function, its properties, examples of manufacturers, or any knowledge that would interest your classmates. The component is assigned to your team according to the number of females in your team. For example, if you have two females, you should research “pressure reducing valve“. No. of Female(s) Component 0 Water meter 1 Fire hydrant 2 Pressure reducing valve 3 Ductile iron pipe 4 Check valve 5 Water‐storage reservoir 2 A 2.0‐m‐diameter pipe of length 1560 m for which the pipe roughness is 1.5 mm conveys water at 12⁰C between two reservoirs at a rate of 8.0 m3/s. What must be the difference in water‐surface elevations between the two reservoirs? Neglect minor losses. 3 A 150‐mm‐diameter pipeline 100 m long discharges a 30‐mm‐diameter jet of water into the atmosphere at a point 60 m below the water surface at intake. The entrance to the pipe is a projecting one, with a minor loss coefficient (K) 0.9, and the nozzle minor loss coefficient (K) is 0.05. Find the flow rate and the pressure head at the base of the nozzle, assuming a Darcy‐Weisbach friction factor (f) of 0.03. AY 2009‐10 CE3132 Water Resources Engineering Department of Civil Engineering National University of Singapore Homework No.5 4 If the flow rate of water through the pipe system shown below is 0.050 m3/s under total head loss of 9.0 m, determine the diameter of pipe C. Assume a Hazen‐ Williams C coefficient of 120 for all pipes. 2 ...
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