In a sewer network, there are a few types of structures used at the junctions. The Sewer Structure Library command allows you to create, edit and store sewer structures. The details of the design and construction of sewer structures can be found in the HEC-22 manual.
For each structure type, a Draw option allows you to place a "profile aspect" detailed image of the structure (complete with annotation) into your drawing.
In the Structure ID box, type the structure name. For the regular outfalls, enter the dimensions of the headwall and wingwalls. For the funnel type outfalls, enable the Use Funnel Symbol toggle and enter the length and widths of the funnel.
In the Box Structure dialog, type the name of the structure in the Structure ID box, enter the length and width of the structure.
In addition to specifying the physical dimensions of the box structure, you also have the ability to indicate one or more "offset locations" that may better position the box structure around the pipes in situations where the roadway direction is skewed relative to the orientation of the pipes:
Consider the following example showing a Box Structure with custom offset:
"X" offsets can vary between -1 (Left) through 1 (Right) as a
decimal factor relative to the structure length.
"Y" offsets can vary between -1 (Back) through 1 (Front) as a
decimal factor relative to the structure width.
In the Structure ID box, type the structure name. Select a Taper Format and enter the Bottom Diameter, Top Diameter, Taper Offset and Taper Height of the structure. A graphic box on the right side of the dialog displays the graphic of the currently defined manhole.
The headwall inlet is very similar to the outfall structure of
headwall type. In the Structure ID box, type the structure name.
Enter the dimensions of the headwall and wingwalls. Inlet loss
coefficient is used in hydrograph routing calculation.
For the funnel type inlet, enable the Use Funnel Symbol toggle and enter the length and widths of the funnel.
Type the Structure ID and add Custom Properties if required.
Pulldown Menu Location: Network > Sewer Network
Libraries > Sewer Structure Library
Keyboard Command: strlib
Prerequisite: None