Build Model Network

In this example, the model network will be developed using the available GIS shape files of the drainage system. This approach is called Drag and Drop Model Building Technique. To build the model network using this technique in project- Example.gdb we have to follow the procedures described below:

1.     In ArcMap table of contents, select the shape file- Subcatchment. Press the left button of the mouse on it and hold. Then drag it to the Model Object Panel and release it over the object- Subcatchments. An attribute mapping window will appear like the following image:

Fig 13: Attribute mapping window for subcatchment objects

Fig 13: Attribute mapping window for subcatchment objects

2.     Assign the property fields appropriately in this window. First click import to add the feature to queue and then click OK to accept the changes made and exit from the window. Note that Name field must be assigned here. Other properties are optional. If not assigned, then the program-default values will be assigned automatically.

3.     Follow steps 1-2 similarly for objects- Rain Gages, Junctions, Outfalls and Conduits. The layer attributes can be mapped in any order. While mapping subcatchment and conduit properties, custom area and length entries can be assigned respectively, by specifying User Defined Area and User Defined Length fields. If these fields are not specified, GeoSWMM will automatically calculate the subcatchment areas and conduit lengths using the ArcMap projection information.

Fig 14: Project save notification

Fig 15: GeoSWMM model network