Question
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A PVC wastewater sewer pipe with an inside diameter of 375 mm
has a slope of . Calculate the pipe’s full flow capacity in
(accurate to 4 dec .pl.). Manning’s roughness coefficient for
PVC is 0.010 .

Ask by Chadwick Nguyen. in Canada
Dec 09,2024

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Tutor-Verified Answer

Answer

The full flow capacity of the PVC wastewater sewer pipe is approximately 0.0584 m³/s.

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Bonus Knowledge

To calculate the full flow capacity, we apply the Manning’s equation:
where:
  • is the flow rate (m³/s)
  • is the Manning’s roughness coefficient (0.010 for PVC)
  • is the cross-sectional area (m²)
  • is the hydraulic radius (m)
  • is the slope of the energy grade line (0.017 in this case).
First, we calculate the area of the pipe:
Next, we determine the hydraulic radius :
The wetted perimeter for a circular pipe flowing full is given by :
So now we can find :
Now embedding everything into Manning’s equation gives us:
Next, calculating the value, we find :
Therefore, the full flow capacity of the pipe is approximately (accurate to 4 decimal places).

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