Solids Builder - SWMM Nodes - Junction

Junctions are nodes in the drainage system where links come together. Physically, they can represent the confluence of natural surface channels, culverts in a sewer system, or pipe connections.

When you want to define a device as a junction, you must add the tool Junction to the Constructor.

When adding the tool Junction, fill in your properties, in the tool's properties frame:

In the Constructor, the following properties must be filled in:

• Identification
  • Name - name of the activity
    The point name must follow the naming rules
  • Description - when the name of the activity is not enough to give context to the activity, use the description field
• SWMM
  • Bottom Elevation - Elevation of the bottom of the node (radier elevation)
    It must be associated with the property of the constructor that manages the device's Sump Elevation, for example:
    
    
  • Initial Depth - Initial depth of water in the storage unit at the start of the simulation
    In general, zero, as it is considered that the rain starts at the beginning of the simulation
  • Maximum Depth - Maximum depth of the storage unit
    Just as the Sump Elevation must also be linked to the geometry/location of the device (see image above)
    In general, it is the height between the top of the cover and the elevation of the bottom of the manhole
  • Depth Overload - Additional water depth beyond the maximum allowable depth before the junction floods
    Just as the Sump Elevation must also be linked to the geometry/location of the device (see image above)
    Note: if you want to make this property more accessible to edit, create a property in the properties frame of the model and assign to this property

A Manhole device can play the role of Junction also, So you have to anticipate these situations. In SOLIDOS it is simple to do this without having to create two different Constructors. For example, consider the simple circular manhole shown in the catalogue:

This manhole will be a typical SWMM node unless it is the endpoint of the network, perhaps because it interconnects into an existing network. To differentiate, you can check if there is a device connected to its output, like this:

Using the Get Property tool, you can get the device name connected to the manhole outlet, like this:

The block Try Catch catches the error that occurs when the activity tries to get the name, because if there is no pipe connected, there is no way to get its name. Thus, one can conclude that the manhole is a Outfall and not a Junction. To define within the Try Catch block, add the exception:

With the following properties:

In the example, SumpElevation is the property that represents the bottom elevation of the manhole: