Elevation-Derived Hydrography READ Rules: Connector: Culvert
A Connector: Culvert is a Subsurface water conveyances under a transportation feature.
Attribute/Attribute Value
Each feature requires domain codes to be entered into the attribute table for the feature class (Elevation-Derived Hydrography Feature type description, associated geometry, and use classification table in the Elevation-Derived Hydrography Data Acquisition Specifications 2023 revision A2). See “Field Definitions and Domain Values for Attributes” section for more information on Elevation-Derived Hydrography code definitions.
Delineation
The limit of culvert is the edges of the water conveyance structure.
Representation Rules
When delineating a feature, it must be created with the appropriate geometry, either point, line, or polygon, which is determined by the size of the feature or the length along different axes of the feature (table 4).
Special conditions:
Culvert water conveyances may take many forms, for example, a corrugated metal pipe running under a driveway, a massive concrete box under a superhighway, or a platform suspended overflowing water. The purpose of the culvert feature in the stream network is to connect the water flowing across a conveyance to the water flowing downstream, without breaking the downstream flow in the network. Culvert features will be delineated as single lines connecting the upstream and downstream segments of single-line streams or artificial paths.
Table 4. Culvert 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) |
| 2-dimensional (polygon) | -- | -- | -- |
Data Extraction
Capture Conditions
If the culvert is greater than 5 feet (1.5 meters) along the longest axis,
then capture.
Attribute Information
FClass 1— Hydrography feature defined within the collection criteria of the elevation-derived hydrography specifications.
FCode 33401— Connector: Culvert (Subsurface water conveyances under a transportation feature).
EClass 3— Linear features below ground level—Examples include connectors through dams, culvert connectors, and terrain breach connectors. Used for hydro-enforcement.
Special Conditions:
Culverts running under other hydrography features.
Source Interpretation Guidelines
None.
