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In the Grids task, create grids as needed for drawing the trench path.
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In the Civil task, click Place Trench Command .
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Click Path on the Place Trench Ribbon, and define the path of the bottom of the trench.
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Select a cardinal point at the bottom of the trench: Bottom Left , Bottom Center , or Bottom Right .
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Select Define start depth and top slope as the placement method.
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Select the parent system of the trench run.
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Select a trench type and its respective cross-section.
The start depth is defined by the Catalog during placement. You can modify this after placement. See Modify a trench feature.
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Type a value for Top Slope.
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Click Finish to create the trench. An example trench elevation is shown below.
1 - Drawn trench path with varying global Z-coordinates along the path
2 - Defined bottom cardinal point for cross-section
3 - Defined start depth from trench cross-section
4 - Defined top slope
5 - Defined footing thickness from trench cross-section
6, 7, 8 - Trench depths computed by (rim elevation from top slope) - (invert elevation from global Z-coordinate of drawn path)