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    By Luke Howell 8.png

    I’m often asked how to create vertical faces in a surface or how to create a Retaining Wall feature.

    Now there are a few different methods, using different tools in Civil 3D, the most common is building it into your corridor assemblies, but what if you don’t have a corridor or that the Retaining Wall isn’t perpendicular to the design?

    I have seen this overcome by offsetting the feature by 0.001m (1mm) and then changing the elevation value and using both as a break line in the surface. This way will only give you a fixed line and commonly gives an error or broken surface due to the Surface properties.

    In this example, we will make a grading style that can target an existing surface and provide a sheer/vertical face that will represent our retaining wall.

    We will start by making a Grading Criteria specifically for Retaining Walls.

    On the Setting Tab of the Prospector, Select Grading, Grading Criteria Set, Basic Set and any of the ‘Surface @ x:x Slope”.

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    Right Click and Copy.

    Rename – Retaining Wall

    On the Criteria Tab, Change the Cut and Fill slope values to 0.001:1 and lock the value

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    Create your feature line and set the elevation required, e.g. Finished Floor Level (FFL) for a new house plot.

    Select the Grading Tools and create a new Grading group, ensure that Automatic Surface Creation is turned on.

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    Make sure your target surface is set.

    Select the Retaining Wall Grading Criteria and apply to the feature line where required.

    If it is a closed Feature line, remember to set an Infill area.

    The Grading should take a near straight line to meet the Surface and create the desired sheer face/retaining wall.

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