> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uxcadconnection.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Urban Curb and Gutter

> Dynamic Civil 3D curb subassembly with configurable curb geometry, flowline controls, point/link/shape codes, and target support.

## Overview

The **UXCAD Dynamic Curb** subassembly creates a configurable curb section with control over flange, flowline, top front, and top back geometry. It is designed to let the user build curb conditions using either fixed dimensions, grades, or target-driven control points.

This subassembly is useful for curb and gutter conditions where the curb shape needs to remain flexible while still maintaining consistent Civil 3D point, link, and shape coding.

## Preview

<img src="https://mintlify.s3.us-west-1.amazonaws.com/uxcadconnectionllc/images/uxcad-dynamic-curb-preview.png" alt="UXCAD Dynamic Curb subassembly preview" />

## Primary Use Cases

* Standard curb and gutter sections
* Flange-to-flowline controlled curb layouts
* Flowline-to-top-front curb face control
* Top-front-to-top-back curb cap control
* Target-driven curb geometry
* Code-controlled corridor surfaces and quantities

## Attachment

The attachment point is located at the **Flange, FlowLine and Top Back Curb** of the curb section.

## Input Parameters

| Parameter                   | Display Name                                              | Description                                                          | Type               | Default                   |
| --------------------------- | --------------------------------------------------------- | -------------------------------------------------------------------- | ------------------ | ------------------------- |
| Insertion\_Point            | Attachment Point                                          | Controls where the subassembly attaches.                             | InsertionPoint     | InsertionPoint\_Flange    |
| Side                        | Side                                                      | Determines whether the subassembly is placed left or right.          | Side               | Right                     |
| Dimension\_H                | Curb Depth                                                | Controls the overall curb depth.                                     | Double             | 0.5                       |
| BackAttachPoint\_Visibility | Show Back of Curb Attach Point                            | Toggles the back curb attachment point on or off.                    | Yes/No             | No                        |
| Dimension\_G                | Back of Curb Attachment Depth                             | Controls the back attachment depth.                                  | Double             | 0.25                      |
| Flange\_Flowline\_Set       | (FL) Set by Height or Grade                               | Controls whether flange-to-flowline is driven by height or grade.    | Flange\_FlowLine   | Flange\_FlowLine\_Grade   |
| Dimension\_B                | Flange to FlowLine Distance                               | Horizontal distance from flange to flowline.                         | Double             | 2                         |
| Dimension\_A                | Flange to FlowLine Height                                 | Vertical height difference from flange to flowline.                  | Double             | -0.1                      |
| Dimension\_A1               | Flange to FlowLine Grade                                  | Grade from flange to flowline.                                       | Grade              | -2.00%                    |
| Flowline\_TopFront\_Set     | (TFC) Set by Height or Grade                              | Controls whether flowline-to-top-front is driven by height or grade. | FlowLine\_TopFront | FlowLine\_TopFront\_Depth |
| Dimension\_C                | FlowLine "FL" to TopFront "Face" Distance                 | Horizontal distance from flowline to top front face.                 | Double             | 0.5                       |
| Dimension\_D                | FlowLine "FL" to TopFront "Face" Height                   | Vertical height from flowline to top front face.                     | Double             | 0.5                       |
| Dimension\_D1               | FlowLine "FL" to TopFront "Face" Grade                    | Grade from flowline to top front face.                               | Grade              | 100.00%                   |
| TopFront\_TopBack\_Set      | Top Front "Face" to Top Back "TBC" Set by Height or Grade | Controls whether top-front-to-top-back is driven by height or grade. | TopFront\_TopBack  | TopFront\_TopBack\_Grade  |
| Dimension\_E                | Top Front "Face" to Top Back "TBC" Distance               | Horizontal distance from top front to top back.                      | Double             | 0.5                       |
| Dimension\_F                | Top Front "Face" to Top Back "TBC" Height                 | Vertical height difference from top front to top back.               | Double             | 0                         |
| Dimension\_F1               | Top Front to Top Back Grade                               | Grade from top front to top back.                                    | Grade              | 0.00%                     |

***

## Target Parameters

| Target Parameter            | Type      | Description                                        | Required |
| --------------------------- | --------- | -------------------------------------------------- | -------- |
| Target\_Flange\_Elevation   | Elevation | Optional elevation target for the flange point.    | Optional |
| Target\_Flange\_Offset      | Offset    | Optional offset target for the flange point.       | Optional |
| Target\_FlowLine\_Elevation | Elevation | Optional elevation target for the flowline point.  | Optional |
| Target\_FlowLine\_Offset    | Offset    | Optional offset target for the flowline point.     | Optional |
| Target\_TopFront\_Elevation | Elevation | Optional elevation target for the top front point. | Optional |
| Target\_TopFront\_Offset    | Offset    | Optional offset target for the top front point.    | Optional |
| Target\_TopBack\_Elevation  | Elevation | Optional elevation target for the top back point.  | Optional |
| Target\_TopBack\_Offset     | Offset    | Optional offset target for the top back point.     | Optional |

***

## Enumerations

The UXCAD Dynamic Curb subassembly uses enumerations to simplify user control and reduce unnecessary parameter exposure. These dropdown-driven controls determine how geometry is calculated throughout the curb section.

<AccordionGroup>
  <Accordion title="InsertionPoint">
    Controls where the subassembly attaches to the corridor assembly.

    | Enum Item                | Display Name | Description                                          |
    | ------------------------ | ------------ | ---------------------------------------------------- |
    | InsertionPoint\_Flange   | Flange       | Attaches the subassembly at the flange point.        |
    | InsertionPoint\_FlowLine | Flow Line    | Attaches the subassembly at the flowline point.      |
    | InsertionPoint\_TopBack  | Top Back     | Attaches the subassembly at the top back curb point. |
  </Accordion>

  <Accordion title="Flange_FlowLine">
    Controls how the flange-to-flowline relationship is calculated.

    | Enum Item               | Display Name | Description                                                    |
    | ----------------------- | ------------ | -------------------------------------------------------------- |
    | Flange\_FlowLine\_Depth | Height       | Uses a vertical height difference between flange and flowline. |
    | Flange\_FlowLine\_Grade | Grade        | Uses a grade value between flange and flowline.                |
  </Accordion>

  <Accordion title="FlowLine_TopFront">
    Controls how the flowline-to-top-front curb face is calculated.

    | Enum Item                 | Display Name | Description                                                   |
    | ------------------------- | ------------ | ------------------------------------------------------------- |
    | FlowLine\_TopFront\_Depth | Height       | Uses a vertical height difference from flowline to top front. |
    | FlowLine\_TopFront\_Grade | Grade        | Uses a grade value from flowline to top front.                |
  </Accordion>

  <Accordion title="TopFront_TopBack">
    Controls how the top-front-to-top-back curb section is calculated.

    | Enum Item                | Display Name | Description                                                   |
    | ------------------------ | ------------ | ------------------------------------------------------------- |
    | TopFront\_TopBack\_Depth | Height       | Uses a vertical height difference from top front to top back. |
    | TopFront\_TopBack\_Grade | Grade        | Uses a grade value from top front to top back.                |

    ###
  </Accordion>
</AccordionGroup>

***

## Code List by Insertion Point

<CardGroup cols={3}>
  <Card title="Flange">
    | Object | Code             |
    | ------ | ---------------- |
    | P1     | Flange           |
    | P2     | Flowline\_Gutter |
    | P3     | Top\_Curb        |
    | P4     | Back\_Curb       |
  </Card>

  <Card title="Flow Line">
    | Object | Code      |
    | ------ | --------- |
    | L1     | Top, Curb |
    | L2     | Top, Curb |
    | L6     | Datum     |
  </Card>

  <Card title="Top Back">
    | Object | Code |
    | ------ | ---- |
    | S1     | Curb |
  </Card>
</CardGroup>

## Behavior

The curb is built from the flange point and continues outward through the flowline, top front, and top back geometry. Each major curb segment can be controlled by a fixed height, fixed grade, or target parameter depending on the selected control method.

## Notes

Use this subassembly when the curb section needs to remain flexible across different design conditions without creating multiple separate curb subassemblies.

## Recommended Image Setup

Save your screenshots or Affinity graphics here:

```text theme={null}
/images/uxcad-dynamic-curb-preview.png
/images/uxcad-dynamic-curb-parameters.png
/images/uxcad-dynamic-curb-targets.png
```

| Parameter                   | Display Name                                              | Description                                                          | Type               | Default                   |
| --------------------------- | --------------------------------------------------------- | -------------------------------------------------------------------- | ------------------ | ------------------------- |
| Insertion\_Point            | Attachment Point                                          | Controls where the subassembly attaches.                             | InsertionPoint     | InsertionPoint\_Flange    |
| Side                        | Side                                                      | Determines whether the subassembly is placed left or right.          | Side               | Right                     |
| Dimension\_H                | Curb Depth                                                | Controls the overall curb depth.                                     | Double             | 0.5                       |
| BackAttachPoint\_Visibility | Show Back of Curb Attach Point                            | Toggles the back curb attachment point on or off.                    | Yes/No             | No                        |
| Dimension\_G                | Back of Curb Attachment Depth                             | Controls the back attachment depth.                                  | Double             | 0.25                      |
| Flange\_Flowline\_Set       | (FL) Set by Height or Grade                               | Controls whether flange-to-flowline is driven by height or grade.    | Flange\_FlowLine   | Flange\_FlowLine\_Grade   |
| Dimension\_B                | Flange to FlowLine Distance                               | Horizontal distance from flange to flowline.                         | Double             | 2                         |
| Dimension\_A                | Flange to FlowLine Height                                 | Vertical height difference from flange to flowline.                  | Double             | -0.1                      |
| Dimension\_A1               | Flange to FlowLine Grade                                  | Grade from flange to flowline.                                       | Grade              | -2.00%                    |
| Flowline\_TopFront\_Set     | (TFC) Set by Height or Grade                              | Controls whether flowline-to-top-front is driven by height or grade. | FlowLine\_TopFront | FlowLine\_TopFront\_Depth |
| Dimension\_C                | FlowLine "FL" to TopFront "Face" Distance                 | Horizontal distance from flowline to top front face.                 | Double             | 0.5                       |
| Dimension\_D                | FlowLine "FL" to TopFront "Face" Height                   | Vertical height from flowline to top front face.                     | Double             | 0.5                       |
| Dimension\_D1               | FlowLine "FL" to TopFront "Face" Grade                    | Grade from flowline to top front face.                               | Grade              | 100.00%                   |
| TopFront\_TopBack\_Set      | Top Front "Face" to Top Back "TBC" Set by Height or Grade | Controls whether top-front-to-top-back is driven by height or grade. | TopFront\_TopBack  | TopFront\_TopBack\_Grade  |
| Dimension\_E                | Top Front "Face" to Top Back "TBC" Distance               | Horizontal distance from top front to top back.                      | Double             | 0.5                       |
| Dimension\_F                | Top Front "Face" to Top Back "TBC" Height                 | Vertical height difference from top front to top back.               | Double             | 0                         |
| Dimension\_F1               | Top Front to Top Back Grade                               | Grade from top front to top back.                                    | Grade              | 0.00%                     |

***

| Target Parameter            | Type      | Description                                        | Required |
| --------------------------- | --------- | -------------------------------------------------- | -------- |
| Target\_Flange\_Elevation   | Elevation | Optional elevation target for the flange point.    | Optional |
| Target\_Flange\_Offset      | Offset    | Optional offset target for the flange point.       | Optional |
| Target\_FlowLine\_Elevation | Elevation | Optional elevation target for the flowline point.  | Optional |
| Target\_FlowLine\_Offset    | Offset    | Optional offset target for the flowline point.     | Optional |
| Target\_TopFront\_Elevation | Elevation | Optional elevation target for the top front point. | Optional |
| Target\_TopFront\_Offset    | Offset    | Optional offset target for the top front point.    | Optional |
| Target\_TopBack\_Elevation  | Elevation | Optional elevation target for the top back point.  | Optional |
| Target\_TopBack\_Offset     | Offset    | Optional offset target for the top back point.     | Optional |

***

## Code List by Insertion Point

<CardGroup cols={3}>
  <Card title="Flange">
    | Object | Code             |
    | ------ | ---------------- |
    | P1     | Flange           |
    | P2     | Flowline\_Gutter |
    | P3     | Top\_Curb        |
    | P4     | Back\_Curb       |
  </Card>

  <Card title="Flow Line">
    | Object | Code      |
    | ------ | --------- |
    | L1     | Top, Curb |
    | L2     | Top, Curb |
    | L6     | Datum     |
  </Card>

  <Card title="Top Back">
    | Object | Code |
    | ------ | ---- |
    | S1     | Curb |
  </Card>
</CardGroup>