VOSWMM

3.2.3 Divider

The divider is a command that divides an inflow into several conduits in an assigned manner.

Flow Dividers are nodes within a drainage system designed to channel incoming flows into a specific conduit in a predetermined manner. A flow divider is limited to having no more than two conduit links on its discharge side. Its functionality is exclusive to Steady Flow and Kinematic Wave routing, while under Dynamic Wave routing, flow dividers are treated as straightforward junctions.

Parameter Name Description Default Value
NHYD Hydrograph number. —
NAME Name of the component. —
COMMENT 1, 2, and 3 Comment for the command. —
Tag Optional category or classification.
System Type Specifies the junction’s system type, whether it belongs in the overland, storm, or sanitary system. Blank
X The X coordinate of the divider. 0
Y The Y coordinate of the divider. 0
Ground Elevation The elevation for the ground level. 0
#Of inlets The number of inlets (catchbasin) assigned to the divider 0
Sag If the divider is laid upon a sag area. 0
Roof Node If the divider represents a roof node.
Delineate Whether to delineate this junction or not.
Invert El. (m) Elevation of divider’s invert. 0
Full Depth (m) Maximum water depth (i.e., distance from invert to the ground surface or 0 to use distance from invert to top of the highest connecting link). 0
Inflows External inflows received at the junction. No
Treatment Pollutant removal supplied at the junction.
Initial Depth [m] Initial water depth in junction. 0
Surcharge Depth [m] Depth over maximum depth before flooding occurs. 0
Pounded Area [m2] Area of ponded water when flooded.
Diverted Link Name of the link which receives the diverted flow.
Divider Type Type of flow Divider (Cutoff/Weir/Tabular/Overflow). *Cutoff
Cutoff Flow [m3/s] Cutoff flow value for a CUTOFF divider. 0

*There are four types of dividers.

  • Cutoff
  • Weir → Min. Flow [m3/s] → Minimum flow at which diversion begins for Weir divider. Max. Depth [m] → Vertical height of weir opening. coefficient → product of the weir’s discharge coefficient and its length.
  • Tabular → Curve → Diversion Curve used with a Tabular divider.
  • Overflow → it passes all inflow above the flow capacity.

Key input parameters for a flow divider encompass standard junction parameters (refer to Junctions), the name of the link receiving the diverted flow, and the method employed to compute the diverted flow amount.