Tunnel Template

 

Delineation

The limit of TUNNEL is the walls of and openings to the passage.

 

Data Extraction

Capture Conditions

 

If TUNNEL provides passage for a hydrographic feature,

Then capture.

 

Source Interpretation Guidelines

 

All

 

            If TUNNEL meets capture conditions and provides passage for another

            feature (CANAL/DITCH, PIPELINE with Product = Water),

Then capture both TUNNEL and the other feature.

 

If a tunnel does not meet capture conditions and carries another feature,

Then capture that feature, and if required, capture UNDERPASS to allow

definition of the relationship between that feature and any other feature over

or under which it passes.

 

If TUNNEL provides passage for ROAD or RAILWAY,

Then collect in the theme Transportation.

If there are two TUNNEL passages and the overall width is < 100 ft,

Or

If there are two TUNNEL passages and the separation between the

passages is < 20 ft, then capture one instance of TUNNEL.

 

Graphic

 

If TUNNEL is symbolized by a three line symbol,

Then capture as one instance of TUNNEL.

 

Water tunnels in Hawaii that are shown with the edit symbol are not captured

as TUNNEL. See WELL.

 

Revision – General

 

Revision - Standard

 

Revision - Limited

 

If the alignment of TUNNEL is unknown,

Then align TUNNEL in a straight line between openings.

 

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