SWMM - Nodes - Divider

Flow dividers are drainage system nodes that divert inflows to a specific conduit in a prescribed manner.

A flow divider cannot have more than two conduit connections on its discharge side.

Flow Dividers are only active in constant flow and kinematic wave routing and are treated as single junctions in dynamic wave routing.

In addition to the SWMM node properties, the Divider also has the following properties:

• SWMM
  • Flooded Area - Area occupied by flooding at the top of the junction after flooding occurs
    See: SWMM Settings / General Options / Allow Flooding
  • Diversion - link that receives the diverted stream:
    
    
    
    Note: The link must be of type linear gravity device and must have property "Start Closed" marked
  • 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
  • Maximum Depth - Maximum depth of the storage unit
  • Depth Overload - Additional water depth beyond the maximum allowable depth before the junction floods
• Divider Type
  • Divider Type - Stream Divider type
    There are four types of flow dividers, defined by how the inputs are diverted:
    1. Cut - diverts all inflow above a defined cutoff value
       In this case, provide: Flow - Cut Flow
    2. Overflow - diverts all inflow above the flow capacity of the non-bypassed conduit
    3. Tabular - Uses a table that expresses the diverted flow as a function of the total input
       In this case, provide: Diversion Curve - Skip curve used with a tabular Divider
    4. Weir - treats bypass flow as linearly proportional to inflow above a defined cutoff value
       In this case, provide: Flow - Cut Flow
  • Maximum Height - Vertical height of the Weir opening
  • Weir Coefficient - Product of the Weir discharge coefficient and its length.
    Weir coefficients are normally in the range of 2.65 to 3.10 per foot for CFS flows

Note: Read-only properties are intrinsic properties of the device, so the type change has to be done in Constructor.

Note: You must click the at the top of the screen.

If it is not visible, it means that the network is not enabled for SWMM. Enable it in your properties: