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Drainage Boundary Definition

Description​

The Drainage Boundary Definition tool generates 3D boundaries lines for selected drainage areas and stores these lines in the output "Drainage Boundary" 3D polyline feature class (Zs are stored in linear unit of the terrain). The tool stores in the output "Drainage Connectivity" table the HydroID of each boundary line.

Drainage areas with internal pits need to be characterized as such before running this function by setting the attribute "IsPitted" to 1 in the deranged input Drainage Area feature class and 0 in the dendritic areas. This is required because only the boundary lines associated to pitted drainage areas will be processed by the tool Elevation-Width-Area Characterization and the tool Drainage Connectivity Characterization. The tool will create the field IsPitted if it does not exist and it will populate the field with "1" if all records have Null values.

The tool sets the field IsIncluded to 1 for the boundaries adjacent to at least one "deranged" area, i.e. a drainage area with an internal pit. These areas are characterized by setting the field IsPitted for the deranged drainage areas. The tool "Drainage Connectivity Characterization" relies on IsIncluded to select the boudaries to process when creating connectivity for deranged areas.

The tool will create the field IsPitted if it does not exist and it will populate the field with "1" if all records have Null values.

Usage​

Parameters​

DirectionTypeParameter NameData TypeDialog Reference
InputRequiredInput Drainage Area Feature ClassGPFeatureLayerInput Drainage Area feature class which will be processed. Must contain the fields HydroID. The field IsPitted will be created and initialized with 1 if it does not exist.IsPitted indicates whether the drainage area contains a pit and is draining internally (IsPitted=1).
InputRequiredInput DEM RasterGPRasterLayerInput Digital Elevation Model used to retrieve elevations
OutputRequiredOutput Drainage Boundary Feature ClassGPFeatureLayerOutput 3D drainage boundary lines associated to the input Drainage Area features.
OutputRequiredOutput Drainage Connectivity TableGPTableViewOutput Drainage Connectivity table storing the HydroIDs of the Drainage Area features located on each side of a boundary line.