Drainage Area Characterization

Description

The Drainage Area Characterization tool (Terrain Morphology) generates elevation, area and volume curves for a set of selected drainage areas. The function divides each drainage area into slices and calculates each slice's elevation characteristics, as well as the cumulative area and volume that are below the elevation of the top of the slice. These characteristics are stored in an output Drainage EAV table. The function works with a selected set of drainage areas or with all drainage areas within the input feature class if there is no selected set.

When a strictly positive extrusion value is specified, one additional slice will be created.

Usage

Parameters

Direction	Type	Parameter Name	Data Type	Dialog Reference
Input	Required	Input Drainage Area Feature Class	GPFeatureLayer	Input drainage area features to process. Required field: HydroIDFields created: MinElev: Minimum elevation for the drainage area in XY unit MaxElev: Maximum elevation for the drainage area in XY unit IsPitted: created empty. Indicates whether the drainage area contains a pit (1). Required by the functions Drainage Boundary Characterization and Drainage Connectivity Characterization. IsDone: Indicates whether the drainage area was successfully processed (1) or not (-1).
Input	Required	Input DEM Raster	GPRasterLayer	Input DEM.
Input	Required	Characterization Type	GPString	Type of characterization performed: Slice_Count Slice_Increment Boundary_MinZ TwoDeltaH
Input	Required	Characterization Type Parameters	GPString	Characterization parameter associated to the type of characterization performed: Slice_Count: number of slices Slice_Increment: increment for each slice Boundary_MinZ: TwoDeltaH
Input	Required	Extrusion (linear units)	GPDouble	Input extrusion value used to create one additional slice (optional).
Output	Required	Output Drainage EAV Table	GPTableView	Output elevation-area-volume table characterizing the slices. Fields created: FeatureID: HydroID of the corresponding drainage area BottomElev: Bottom elevation of the slice in XY unit TopElev: Top elevation of the slice in XY unit SlcElev: Middle elevation of the slice, i.e. (top + bottom)/2 in XY unit CumArea: Area of the drainage area having an elevation that is less than or equal to the top elevation of the slice. CumVolume: Volume of water needed to fill the drainage area up to the top elevation of the slice.
Input	Optional	Input Exclusion Area Feature Class	GPFeatureLayer	Optional exclusion areas features defining the areas that will not be characterized.