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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 top of the trench.
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Select a cardinal point at the top of the trench: Top Left , Top Center , or Top Right .
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Select Define start and end invert elevation as the placement method.
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Select the parent system of the trench run.
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Type values for Start Invert Elevation and End Invert Elevation. The value of the invert elevations should be less than the elevation of the 3D Sketch path.
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Select a trench type and its respective cross-section.
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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 top cardinal point for cross-section
3 - Defined start invert elevation
4 - Defined end invert elevation
5 - Defined footing thickness from trench cross-section
6 - Invert elevation computed between start and end invert elevations
7, 8, 9, 10 - Trench depths computed by (global Z-coordinate of drawn path) - (invert elevation)