SWMM Node Data Editor

Nodes are points of a conveyance system that connect conveyance links together. Nodes are also the points where external inflows can enter a drainage system, and where removal of pollutants through treatment can occur. There are four different node types.

Node Type	Description
Junctions	Junctions are drainage system nodes where links join together. Physically they can represent the confluence of natural surface channels, manholes in a sewer system, or pipe connection fittings. External inflows can enter the system at junctions. Excess water at a junction can become partially pressurised, while connecting conduits are surcharged and can either be lost from the system, or be allowed to pond atop the junction and subsequently drain back into the junction.
Outfalls	Outfalls are terminal nodes of the drainage system used to define final downstream boundaries under Dynamic Wave flow routing. For other types of flow routing they behave as a junction. Only a single link can be connected to an outfall node. The boundary conditions at an outfall can be described by any one of the following stage relationships: The critical or normal flow depth in the connecting conduit. A fixed stage elevation. A tidal stage described in a table of tide height versus hour of the day. A user-defined time series of stage versus time.
Flow Dividers	Flow Dividers are drainage system nodes that divert inflows to a specific conduit in a prescribed manner. A flow divider can have no more than two conduit links on its discharge side. Flow dividers are only active under Kinematic Wave routing and are treated as simple junctions under Dynamic Wave routing. There are four types of flow dividers, defined by the manner in which inflows are diverted: Cutoff - Diverts all inflow above a defined cutoff value. Overflow - Diverts all inflow above the flow capacity of the non-diverted conduit. Tabular - Uses a table that expresses diverted flow as a function of total inflow. Weir - Treats diverted flow as linearly proportional to the inflow above a defined cutoff value.
Storage Units	Storage Units are drainage system nodes that provide storage volume. Physically they could represent storage facilities as small as a catchbasin, or as large as a lake. The volumetric properties of a storage unit are described by a function or table of surface area versus height.

You can use the following options to navigate between nodes.

Option	Description
Arrow Buttons	Click on the arrow buttons to scroll between the node records. The two outer arrows scroll to the first and last record.
Delete/Recall Button	Mark the current record for deletion, or if it has already been deleted it removes the deletion flag. Deleted records are only removed from the database when you close the project and answer Yes to the question "Do you want to remove deleted records?". Once the database has been packed, it is impossible to recover the deleted records.
Record Number Button	Search for a specific record.
Show Button	Move the mouse cursor to the specific node for that record. The window automatically zooms into the area around that node.
Close Button	Close the window.

Junction Node

Option	Description
Inlet Node Name	The name or reference to this node in up to 25 alpha-numeric characters. Searches can be performed on these names.
Outlet Node Name	The name of the downstream node.
Cover Level	The level of the node (manhole) cover.
Lock	Option to lock the cover level to the specified level.
Freeboard	Height that the manhole cover must be above the extracted cover level.
Inlet Invert Level	Invert elevation of the junction.
Max Depth	Maximum depth at the junction i.e. the distance from the invert to the cover level. If zero, the distance from the invert to the top of the highest connecting link is used.
Initial Depth	Depth of water at the junction at the start of the simulation.
Surcharge Depth	Additional depth of water beyond the maximum depth that is allowed before the junction floods. This parameter can be used to simulate bolted manhole covers.
Ponded Area	Area occupied by ponded water atop the junction after flooding occurs (sq. meters or sq. feet). If the Allow Ponding analysis option is turned on, a non-zero value of this parameter allows ponded water to be stored and subsequently returned to the drainage system when capacity exists.
Manhole Type	Select a manhole type as defined in the Default Settings.

Outfall Node

Option	Description
Outfall Properties	Edit the Outfall Properties.
Node Name	The name or reference to this node in up to 25 alpha-numeric characters. Searches can be performed on these names.
Outflow Link	Name of the downstream link.
Cover Level	The level of the node (manhole) cover.
Lock	Option to lock the cover level to the specified level.
Freeboard	Height that the manhole cover must be above the extracted cover level.
Manhole Type	Select a manhole type as defined in the Default Settings.

Divider Node

Option	Description
Divider Properties	Edit the Divider Properties.
Node Name	The name or reference to this node in up to 25 alpha-numeric characters. Searches can be performed on these names.
Outflow Link	The name of the downstream link.
Cover Level	The level of the node (manhole) cover.
Lock	Option to lock the cover level to the specified level.
Freeboard	Height that the manhole cover must be above the extracted cover level.
Manhole Type	Select a manhole type as defined in the Default Settings.

Storage Node

Option	Description
Node Type	Nodes are points of a conveyance system that connect conveyance links together. Nodes are also the points where external inflows can enter a drainage system, and where removal of pollutants through treatment can occur. There are four different node types: Junctions Outfalls Flow Dividers Storage Units
Storage Properties	Edit the Storage Properties.
Node Name	The name or reference to this node in up to 25 alpha-numeric characters. Searches can be performed on these names.
Outflow Link	The name of the downstream link.
Cover Level	The level of the node (manhole) cover.
Lock	Option to lock the cover level to the specified level.
Freeboard	Height that the manhole cover must be above the extracted cover level.
Manhole Type	Select a manhole type as defined in the Default Settings.

Swmm Runoff

Option	Description
Subcatchment	The subcatchment can be selected from a list. The runoff area is then calculated from the subcatchment polygon. The subcatchment option is not active if the area is locked. Click ... to edit the subcatchment properties in the Subcatchment Editor.
Inflows	Displays No or Yes to indicate the existence of Inflows. Click ... to assign Direct, Dry Weather, or RDII Inflows to the junction .
Treatment	Displays No or Yes to indicate that treatment functions have been assigned or not. Click ... to edit a set of treatment functions for pollutants entering the node.

Swmm Control

Option

Description

Node Y Coordinate

The Y coordinate of the node or manhole.

Node X Coordinate

The X coordinate of the node or manhole.

Swmm Results

Option

Description

Results

Selected results are presented on this page for your information.