The Pipe Size Library command allows you to store the dimensions of the widely used pipes. There are four pipe sections: box, circular, horizontal ellipse and vertical ellipse. The library file is in the ...\USER folder and is available for all projects in both culvert design and sewer network design.
From the Network > Sewer Network Libraries menu in the Hydrology Module, select Pipe Size Library to open the library dialog. The Section Type list contains four section types. You can select one pipe shape to display all the pipe sizes of that shape in the spreadsheet. In the right column of the spreadsheet, the Available in Design check boxes are listed next to the pipe sizes indicating that whether the pipe sizes are available in the pipe size design or not.
New button adds a new pipe size, Edit button allows you to modify an existing pipe size, and Delete button removes the highlighted pipe size from the library. Load and SaveAs buttons allow you to load and save the pipe size data.
In order to maintain the minimum velocity for pipe self-cleaning, the pipe size library stores a list of typical minimum slopes for corresponding pipe diameters. For pipes other than circular type, their internal sizes are converted to diameters with the same sectional areas. Click on Set Min Slope button to display the Minimum Pipe Slope dialog, which allows you to edit the values.
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| Pipe Size Library |
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| Minimum Pipe Slope |
In the Circular Section dialog, type the value in the Diameter box, and then the full cross-section area is calculated and displayed. Click on OK button to commit the pipe size entry.
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| Circular Section |
In the Box Section dialog, type the values in the Height and Width boxes, and then the full cross-section area is calculated and displayed. Click on OK button to commit the pipe size entry.
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| Box Section |
In the Horizontal and Vertical Ellipse Section dialog, type the values in the Rise, Span and Full Area boxes. The Equivalent Diameter is the diameter of a circular section that is equivalent to the ellipse. The Flow Area Factor is the ratio of the calculated full area to the specified full area. A0, A1, A2, A3 and A4 are the five coefficients to the 4th order polynomial equation, which describes the relationship between the wetted perimeter (in) of the ellipse and the depth/rise ratio, as below.
p = A0 + A1 (d/r) + A2 (d/r)2
+ A3 (d/r)3 + A4 (d/r)4
where: p = wetted perimeter (in or mm)
d =
water depth in the pipe (ft or m)
r =
pipe rise (ft or m)
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| Ellipse Section |
Pipe Size Library dialog: Fill in values.
Pulldown Menu Location: Network
> Sewer Network Libraries > Pipe Size Library
Keyboard Command: pszlib
Prerequisite: None
File Name: \lsp\cntr_grd.arx