Site Grading and Drainage in Civil 3D: Feature Lines, Grading Groups & Surface Smoothing

September 08, 2026 - BY Admin

Site Grading and Drainage in Civil 3D: Feature Lines, Grading Groups & Surface Smoothing

Shaping Building Pads, Parking Lots and Water Detention Basins

Raw land topography rarely features flat, buildable zones. Site grading reshapes natural ground contours into commercial building pads while directing stormwater runoff into retention ponds.

Grading Workflows in Autodesk Civil 3D

Grading tools connect elevation breaklines dynamically to existing terrain models.

Feature Lines: 3D elevation lines defining curb tops, building pad boundaries, and ditch flowlines.
Grading Criteria Sets: Projecting slopes outward at specified ratios (e.g., 2:1 slope to surface or 1% grade to distance).
Dynamic Earthwork Balancing: Adjusting building pad elevations to balance cut and fill volumes on site.

Learn site grading and land modeling in the Civil 3D Course at CADDEX.

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