The subassembly is used to create a ditch structure with optional backslope and foreslopes.
Attachment
The attachment point is the innermost point on the grading links preceding the ditch structure. If grading links are omitted, then the attachment point is the innermost point on the inside wall of the ditch structure (shown in blue circle).
Input Parameters
Note: All dimensions are in meters or feet unless otherwise noted. All slopes are in run-over-rise form (for example, 4 : 1), unless indicated as a percent slope with a “%” sign.
| Parameter | Description | Type | Default |
|---|---|---|---|
| Side |
Specifes to insert the subassembly either on the right or the left side of the attachment point. |
Left / Right | Right |
| Depth | Inside depth of the ditch. | Numeric, Positive |
0.45 m 1.5 ft |
| Bottom Width | Width of bottom of the channel. | Numeric, Positive |
0.5 m 1.5 ft |
| Sideslope | Ditch sideslopes | Numeric | 1:2 |
| Ditch Wall Depth | Depth of the ditch wall. This is measured perpendicular to the side of the slope, as shown in the previous diagram. | Numeric, Positive |
0.1 m 0.33 ft |
| Inside Extension Height | Non-lined extension of ditch inside over the attachment point | Numeric, Positive |
0.15 m 0.45 ft |
| Inside Backslope Width | Ditch backfill width on the inside | Numeric, Positive |
1.5 m 5.0 ft |
| Outside Backslope Width | Width of non-lined width beyond the outer point of the ditch structure | Numeric, Positive |
0.1 m 0.33 ft |
Target Parameters
This section lists the parameters in this subassembly that can be mapped to one or more target objects, such as a surface, alignment, or profile object in a drawing. For more information, see To Specify Corridor Targets.
Target Parameters: None.
Output Parameters
None.
Behavior
The subassembly builds the shape for a ditch structure, as shown in the above illustration.
In Autodesk Civil 3D 2010 and previous versions, the Ditch Wall Depth parameter was measured vertically. In Autodesk Civil 3D 2011 and later, this parameter is measured perpendicular to the side of the slope. Therefore, if you open a drawing containing these subassemblies that was created in Autodesk Civil 3D 2010 or prior in Autodesk Civil 3D 2011 or later, and then rebuild the corridor(s), this parameter will be changed to reflect the new behavior. Any volume reports that use this subassembly will be updated to reflect the new behavior.
Layout Mode Operation
In layout mode, this subassembly is created outward, starting from the attachment point, as defined using the input parameters.
Point, Link, and Shape Codes
The following table lists the point, link, and shape codes for this subassembly that have codes assigned to them. Point, link, or shape codes for this subassembly that do not have codes assigned are not included in this table.
| Point/Link | Codes | Description |
|---|---|---|
| P1, P6 | Ditch_Back | |
| P2, P5 | Ditch_Face | |
| P10 | Ditch_In | |
| P11 | Ditch_Out | |
| L9, L10, L11 | Top, Datum | |
| L1 to L5 | Top, Ditch_Top | |
| L6, L7, L8 | Datum, Ditch_Bottom | |
| S1 | Ditch | Ditch structure shape area |
Coding Diagram
