Chapter 4 E NGINEERING L IBRARIES
4.5 Section Size
A listing of typical component sizes for specific material types used in storm and sanitary sewer design is provided. Occasionally, there may be situations where specific component sizes or types will not be physically available for a project. You may wish to remove these component types from the listing so that they are not used during automatic design. Similarly, your project may require a size that is not in the list provided.
This powerful engineering library system allows you to add and remove section sizes, or edit the properties of an existing section size. The default list includes hundreds of predefined section sizes in five different shapes. Each section size can be made available for any of the defined materials.
The five section shapes are:
x Arch x Box x Circular
x Horizontal Ellipse
48 Chapter 4 – Engineering Libraries x Vertical Ellipse
Section size properties are edited through the use of the Engineering Library Manager and the Engineering Library Editor.
To access the Section Size Properties dialog, select Tools\Engineering Libraries from the pull-down menu. Click the Edit column of the Section Size Library, and click the button that appears. Select a section size from the list, and click the Edit button.
4.5.1 Arch Section Size Properties
The Arch Section Size Properties tab in the Section Size Properties dialog is used to edit the physical properties for arch sections. These properties control how the section is displayed, and define the hydraulic parameters used during calculations.
x US Label - Enter the label for the section that will be used when the predominant unit system is US Customary.
x SI Label - Enter the label for the section that will be used when the predominant unit system is System International (SI).
x Span - Enter the span (width) of the arch shape.
x Rise - Enter the rise (height) of the arch shape.
x Full Area - Enter the full cross-sectional area for the arch.
x Bottom Radius - Enter the radius for the bottom curve of the arch.
x Bottom Distance - Enter the distance from the bottom of the arch section to the pivot point for the top curve.
x Corner Radius - Enter the radius for the corner curves of the arch.
x Top Radius - Enter the radius for the top curve of the arch.
4.5.2 Box Section Size Properties
The Box Section Size Properties tab in the Section Size Properties dialog is used to edit the physical properties for box sections. These properties control how the section is displayed, and define the hydraulic parameters used during the calculation.
x US Label - Enter the label for the section that will be used when the predominant unit system is US Customary.
x SI Label - Enter the label for the section that will be used when the predominant unit system is System International (SI).
x Span - Enter the span (width) of the box shape.
x Rise - Enter the rise (height) of the box shape.
x Full Area - The calculated full area for the box.
4.5.3 Circular Section Size Properties
The Circular Section Size Properties dialog is used to edit the physical properties for circular sections. These properties control how the section is displayed, and defines the hydraulic parameters used during the calculation.
x US Label - Enter the label for the section that will be used when the predominant unit
system is US Customary.
x SI Label - Enter the label for the section that will be used when the predominant unit system is System International (SI).
x Diameter - Enter the diameter of the section.
x Full Area - The calculated full area for the circular section.
4.5.4 Ellipse Section Size Properties
The Ellipse Section Size Properties dialog is used to edit the physical properties for both horizontal and vertical ellipse sections. These properties control how the section is displayed, and define the hydraulic parameters used during the calculation.
x US Label - Enter the label for the section that will be used when the predominant unit system is US Customary.
x SI Label - Enter the label for the section that will be used when the predominant unit system is System International (SI).
x Span - Enter the span of the ellipse shape.
x Rise - Enter the rise of the ellipse shape.
x Full Area - Enter the full cross-sectional area for the ellipse.
x a0, a1, a2, a3, a4 - Enter the five coefficients to the 4th order polynomial equation, which describes the relationship between the wetted perimeter (in inches) of the ellipse and the depth/rise ratio, as follows:
2 2 3
3 4
4 5
5
x Equivalent Diameter - Enter the diameter of a circular section that is equivalent to the ellipse.
x Flow Area Factor - Enter the flow area factor for the ellipse. This is the ratio of the calculated full area (S * rise * span / 4) to the specified full area.
4.5.5 Available in Materials
Each section size is available in a variety of materials, which means you only have to define the physical characteristics of the section once.
This tab in the Section Size Properties dialog is used to specify the materials in which the section size is available. Just add those materials to the table from the list provided. The list of materials to choose from, also accessible in the Material Library, can also be edited. See the Engineering Library Editor for more details.
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