Working with GeoSWMM 2D project

GeoSWMM 2D Modeling requires to migrate a 1D model to 2D model to access the 2D tools, and provides options to develop and simulate the simple hydraulic and hydrologic modeling allowed in SWMM to analyze complex physical landscapes. GeoSWMM has integrated a sequence of tools which streamline the process from define boundary condition to creation of the required layers and attributes for 2D model. To develop 2D flood model, it is recommended to generate all the 2D layers using GeoSWMM. All the Detailed features of these tools have been described in Development of GeoSWMM 2D Project. The available tools under the GeoSWMM 2D Menu are:

• Enable 2D Modeling

• Define Boundary Layer

• Create 2D Nodes

• Create 2D Layers

• Connect 1D – 2D

• Generate Flood Raster

Migrate to 2D Model convert the 1D Model to 2D Model and generate following 2D layers within the project database:

• Boundary Layer

• Nodes 2D

• Junction 2D

• Conduit 2D

• Cell 2D

• Orifice 2D

• Weir 2D

Define Boundary Layer tool will assist to generate polygon features in Boundary Layer as boundary condition for extent of 2D grid.

Create 2D Nodes tool will create 2D point features in Nodes 2D layer.

Create 2D Layers tool will create features into the Junction 2D, Conduit 2D and Cell 2D layers.

Connect 1D-2D tool will develop connection between 1D and 2D domain by creating features in Orifice 2D/ Weir 2D layers or with direct connection.

Generate Flood Raster tool will help the user to export raster file for Maximum Flood Depth and Water Surface Elevation for within the boundary area.

Thus the sequence and process to be followed to develop 2D model is:

Fig.141: GeoSWMM 2D modeling approach