Urban design - curb slope control (curb cuts)

urbn-dsn-crb-slp-cntrl-01.mp4 3:46

Opted to use generic LinkWidthAndSlope subassemblies to for the curb and gutter. This opens the door for using the profile slope control workflow to create curb cuts. There is a profile that will represent the gutter slope, curb face slope, and top of curb slope. For driveway curb cuts, only the curb face profile will need modification. For curb ramps, the gutter, curb face, and curb top will all need manipulation.

The base layers under the curb and gutter are also formed using the generic LinkWidthAndSlope subassembly. The slope of these subassemblies is determined through parameter reference of the adjacent lane slope.

urbn-dsn-crb-slp-cntrl-02.mp4 6:51

For more information on create profiles for profile slope control, see the profile slope control portion of the Civil 3D training.

1. Create a profile to represent the gutter slope, curb face slope, and curb top slope for each side of the roadway for a total of 6 profiles.
   1. Profile view elevation range will be -1 to 60.
   2. Curb face slope for a 6 inch curb head offset by 0.01 ft is 50 ft/ft.
   3. Elevation for the profile is 50.
   4. Gutter face slope is -0.0625 ft/ft. Elevation for the profile is -0.0625.
   5. Top of curb slope is 0.
   6. Elevation for the profile is 0.

Once the profiles are complete for one side of the roadway, trace them for the other side of the roadway on the same profile views. Then, create a new profile view for the other side of the roadway. Turn on only profiles that are applicable for the profile view.

urbn-dsn-crb-slp-cntrl-03.mp4 6:54

Create a layer for driveway aprons. One will be needed for the left side and the right side of the roadway. Draw the edges of the apron with polylines and include a polyline segment that goes down curb the length of the curb head transition. There are various driveway apron details available. Only one type of driveway apron is shown in this video.

Once one driveway is complete, the polylines can be copied to other driveways.

urbn-dsn-crb-slp-cntrl-04.mp4 5:28

1. Create AutoCAD point at the curb head transition locations
2. Select all of the points on one side of the roadway and project them onto the respective profile view.
3. Set the elevation of the project points to follow the curb face profile.
4. With the points projected, add PVIs to the curb face profile by using the node OSnap to snap to each of the projected points.
5. Using the profile elevation tabular editor, set the curb face profile elevations at the driveway apron. For example, a ¾-inch curb head lip for a driveway would be a profile elevation of 6.25 (0.75/12/0.01). The elevations should always be in pairs. This makes it easy to quickly edit the elevations.