Elevation-Derived Hydrography READ Rules: Pipeline

A surface or subsurface, closed, constructed conduit for conveying water (Figure 57).

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Imagery and a map depicting a pipeline. — **Figure 57.** The various pipelines that form the Governor Edmund G. Brown West Branch California Aqueduct are shown as an example of Pipeline features. Source data are from the NHD (U.S. Geological Survey, 2020), which is used to provide examples of hydrographic feature types but may not have the same density and other characteristics of elevation-derived hydrography.

Delineation

The limit of an underground Pipeline is the edge of the ground scars or linear clearings, or other above ground artifacts that can be detected from ancillary data or other methods.

The limit of a near-ground or elevated Pipeline is the extent of the structure.

Representation Rules

Delineate features as points, lines, or polygons based on their area or length along different axes (Table 28).

**Table 28.** Pipeline Representation Rules.
Kind of feature object	Area	Shortest Axis	Longest Axis
0-dimensional (point)	--	--	--
1-dimensional (line)	--	greater than 0	greater than 5 feet (1.5 meters) above ground or 50 feet (~15 meters) underground
2-dimensional (polygon)	--	--	--

Special Conditions

None.

Data Extraction

Capture Conditions

Above Ground

If Pipeline conveys water between natural water features such as Stream/river or Lake/pond features, is above ground, is not underwater, and is greater than or equal to 5 feet (1.5 meters) along the longest axis,

then capture with EClass of 0 and FClass of 2.

Note: The Pipeline must connect to existing water features or water conveyance on both ends.

Underground

If Pipeline conveys water underground, is in NHD, or the Pipeline is greater than 50 feet in length from other ancillary sources,

then capture.

Note: Only above ground pipelines are required to be captured, but if an ancillary source is used, an underground pipeline can be added to connect above ground features. Source of the ancillary data must be cited.

Through Transportation Feature

If Pipeline conveys water under a road or other transportation feature,

then capture as a Connector: Culvert with EClass of 3, (see Connector: Culvert description for FCode), and not as Pipeline.

Attribute Information

FClass 2— Hydrography feature captured outside the collection criteria of the elevation-derived hydrography specifications.
FCode 42800—Pipeline (A surface or subsurface, closed, constructed conduit for conveying water).
EClass 0— Not used to create elevation derivatives.

FClass 1—Hydrography feature defined within the collection criteria of the elevation-derived hydrography specifications.
FCode 42800—Pipeline (A surface or subsurface, closed, constructed conduit for conveying water).
EClass 2— Linear feature that follows elevation surface.

Source Interpretation Guidelines

None.