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Problem 6. Pipes made of plastic are frequently used in sewers. Plastic pipe walls can be assumed smooth with the friction factor dependent upon Reynolds Number only. For the following, use a pipe diameter of 12 inches and a kinematic viscosity of 1.22 x 10-5 ft²/s. a. Using the Moody Diagram, calculate the friction slope (hL/L) for flow rates of 4 and 8 cfs when flowing full. By what percentage do the friction factors vary? b. Compute the friction slope for the two flow using the Hazen-Williams Equation with C = 150. Do these values deviate by more than 10% of the previous values? c. For plastic pipes, a Manning's n value of 0.009 is often cited. Calculate the friction slopes for the two flow rates. Is more than a 10% difference when compared to the Darcy- Weisbach Equation?

Problem 6. Pipes made of plastic are frequently used in sewers. Plastic pipe walls can be assumed smooth with the friction factor dependent upon Reynolds Number only. For the following, use a pipe diameter of 12 inches and a kinematic viscosity of 1.22 x 10-5 ft²/s. a. Using the Moody Diagram, calculate the friction slope (hL/L) for flow rates of 4 and 8 cfs when flowing full. By what percentage do the friction factors vary? b. Compute the friction slope for the two flow using the Hazen-Williams Equation with C = 150. Do these values deviate by more than 10% of the previous values? c. For plastic pipes, a Manning's n value of 0.009 is often cited. Calculate the friction slopes for the two flow rates. Is more than a 10% difference when compared to the Darcy- Weisbach Equation?

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter6: Hydraulic Conductivity
Section: Chapter Questions
Problem 6.14P
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Problem 6. Pipes made of plastic are frequently used in sewers. Plastic pipe walls can be assumed smooth with the friction factor dependent upon Reynolds Number only. For the following, use a pipe diameter of 12 inches and a kinematic viscosity of 1.22 x 10-5 ft²/s. a. Using the Moody Diagram, calculate the friction slope (hL/L) for flow rates of 4 and 8 cfs when flowing full. By what percentage do the friction factors vary? b. Compute the friction slope for the two flow using the Hazen-Williams Equation with C = 150. Do these values deviate by more than 10% of the previous values? c. For plastic pipes, a Manning's n value of 0.009 is often cited. Calculate the friction slopes for the two flow rates. Is more than a 10% difference when compared to the Darcy- Weisbach Equation?
Transcribed Image Text:Problem 6. Pipes made of plastic are frequently used in sewers. Plastic pipe walls can be assumed smooth with the friction factor dependent upon Reynolds Number only. For the following, use a pipe diameter of 12 inches and a kinematic viscosity of 1.22 x 10-5 ft²/s. a. Using the Moody Diagram, calculate the friction slope (hL/L) for flow rates of 4 and 8 cfs when flowing full. By what percentage do the friction factors vary? b. Compute the friction slope for the two flow using the Hazen-Williams Equation with C = 150. Do these values deviate by more than 10% of the previous values? c. For plastic pipes, a Manning's n value of 0.009 is often cited. Calculate the friction slopes for the two flow rates. Is more than a 10% difference when compared to the Darcy- Weisbach Equation?
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