Use this dialog box to select the pipe network data in the drawing to export to an .stm file format.
This dialog box is used for exporting AutoCAD Civil 3D pipe network data to an .stm file so that it can be used by the Hydraflow Storm Sewers Extension.
Note: You cannot open .stm files that were exported from AutoCAD Civil 3D, or that were saved in the Storm Sewers Extension for Civil 3D 2010, in the Storm Sewers Extension for Civil 3D 2009, or earlier versions of the Storm Sewers Extension.
- Specify Objects To Be Exported
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Lists the AutoCAD Civil 3D pipe networks that exist in the current drawing. Expand the collections to display all of the subcomponents.
Select or clear the check box to the left of each item select the items that you want to export to an .stm file format.
Note: The check boxes have a tri-state display. If only some items are selected under a collection, the check box is shaded
. If all the items are selected, the check box is selected 
. If all the items below the collection are cleared, the check box for the collection is cleared 
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Pick From Drawing
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Specifies pipe networks to export by selecting from the drawing.
Note: If you access this dialog box by right-clicking a collection in the Prospector tree and selecting Export to Storm Sewers, the Pick From Drawing button is not available. - OK
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When you click OK, the Export Storm Sewers to File dialog box is displayed where you can select a location to save the .stm file.