Creating 2D Nodes

The Create 2D Nodes tool generates 2D node points using the attributes assigned in the Boundary Layer and works with a DEM to generate the 2D cells and 2D junctions. The tool requires a DEM raster and a Boundary Layer as input, with the option to include an Obstruction layer. GeoSWMM allows the obstruction of flow through Obstruction Layer , which is expected to be polygon features. The output layer will be stored in the project geodatabase. You must manually edit or remove any 2D node features if desired.

Fig.158: Create 2D Nodes option in 2D Modeling Tool list

Fig.158: Create 2D Nodes option in 2D Modeling Tool list

The interface of this tool looks like the following:

Fig.159: Create 2D Nodes Tool window

Fig.159: Create 2D Nodes Tool window

Steps:

• The ** Boundary Layer** will be directly assigned from the Define Boundary Layer tool, where the layer is saved in the GeoSWMM project.

• Assigning Obstruction layer is optional. However, you can specify Obstruction Layers from:

a)The ArcMap TOC panel through the dropdown list

b)The browse option

• Click the “+” sign to add the obstruction layer as selected layer in the list. To remove a layer, select a layer and click “-” sign.

• Assign a DEM raster either from the ArcGIS ToC or by browsing from the computer drives.

• 2D Nodes will be stored in the Project geodatabase.

• Click “ Create ” to generate the points.  A point layer named “Nodes_2D” will be added to the ArcGIS ToC.