ah-docs

Geodatabase to SDF

Description

Export GeoRAS layers to HEC-RAS compatible SDF format file (HEC-RAS GIS export format). HEADER, STREAM NETWORK and basic CROSS-SECTIONS components of the sdf file are populated. Input layers need to have the following fields populated:

Rivers:

• RiverCode (river code)
• ReachCode (reach code)
• From_Node
• To_Node

2D Cross-sections:

• HydroID
• RiverCode (river code)
• ReachCode (reach code)
• ProfileM (stationing along river)
• LeftBank (fraction to left bank)
• RightBank (fraction to right bank)
• ChLength (distance to downstream cross-section along the river or channel flow path)
• LLength - optional field (distance to downstream cross-section along left flow path)
• RLength - optional field (distance to downstream cross-section along right flow path)
• NodeName (field must exist but does not need to be populated)

3D Cross-sections:

• XS2DID

Mannings N table:

• XS2DID
• Fraction
• N_Value

2D Bridge/culverts:

• HydroID
• RiverCode (river code)
• ReachCode (reach code)
• ProfileM (stationing along river)
• USDistance (upstream distance)
• TopWidth (top width)
• NodeName (field must exist but does not need to be populated)

3D Bridge/culverts:

• XS2DID

Note that value of ChLength will be automatically assigned to main, left, and right reach lengths in the sdf file if optional fields “LLenght” and “RLength” are not in the cross-section feature class.

Usage

Parameters

Direction	Type	Parameter Name	Data Type	Dialog Reference
Input	Required	Input 2D Cross Section Feature Class	GPFeatureLayer	Cut line feature class (2D cross-section). It must have required attributes correctly populated.
Input	Required	Input 3D Cross Section Feature Class	GPFeatureLayer	Profile line feature class (3D representation of cross-sections). It must have required attributes correctly populated.
Input	Required	Input River Feature Class	GPFeatureLayer	River feature class. It must have required attributes correctly populated.
Input	Required	Input Elevation Surface	GPComposite	Surface that was used to create profile lines. This can be DEM, TIN, or a terrain surface.
Input	Optional	Input Manning's N Table	GPTableView	Manning’s N table with roughness coefficient change along each cut line. It must have required attributes correctly populated.
Input	Optional	Input 2D Bridge/Culvert Feature Class	GPFeatureLayer
Input	Optional	Input 3D Bridge/Culvert Feature Class	GPFeatureLayer
Output	Required	Output SDF File	DEFile	Name (including path) of the output sdf file that will be generated.