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Table Of Contents
Chapter 5 Working with Hydrology Commands
492
Specifying an Elevation
You can define the roadway, inlet, and outlet elevations by selecting a point on
the roadway in your drawing.
NOTE
A surface from which to extract the elevation must be set as current in the
drawing, or you must use an object snap when selecting a 3D object.
To specify an elevation
1 In the Culvert Design dialog box, click the Select button next to the Roadway
Elev, Inlet Elev, or Outlet Elev boxes. The Culvert Design dialog box closes
temporarily and the following prompt is displayed:
Select point (or Dtm):
2 Select the point or type Dtm to select a point from a terrain model surface. For
more information, see Selecting a Point from a DTM Surface in this chapter.
Use the following guidelines for selecting points:
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For the roadway elevation, select a point on the roadway.
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For the inlet elevation, select a point on the inlet.
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For the outlet elevation, select a point on the outlet.
The Culvert Design dialog box displays and the value of the length you selected
is displayed in the elevation text box.
3 Click OK to exit the dialog box.
Selecting a Point from a DTM Surface
When you see the following prompt, you can either select a point from the
drawing or select a terrain model surface and select a point from that surface:
Select point (or Dtm):
Do one of the following:
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Select the point to use. You can use object snaps to accurately select the
point or points.
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Type Dtm, select the surface from the Select Surface dialog box, click OK,
and then select the point in the drawing.
The points elevation is determined from the surface you selected.
Displaying a Summary of the Culvert Calculations
In the Culvert Design dialog box, there is an Input button that you can click to
display a summary of recent culvert data that you either entered or loaded into
this dialog box.
To display a summary of the culvert data you've entered or loaded into the
culvert design dialog box
1 In the Culvert Design dialog box, click Input to display the Input Data Display
dialog box. The Input Data Display dialog box summarizes data for:
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Inlet Control: Displays the culvert type and entrance geometry
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Outlet Control: Displays the culvert entrance loss coefficient