Outlet Data Fields (SWMM)

Outlets are flow control devices that are normally used to control outflows from storage nodes.

Outlet data can be edited on either the Outlet Grid Window of the Links Grid or the Outlet Property Sheet.

To view and edit all outlet data, use the Property Sheet.

This table describes all the link specific data which can be used to define a outlet for a SWMM network. For details of results fields for outlets, see the Link Results Data Fields (SWMM) topic.

Common Data Fields

Fields that are common to the majority of objects can be found in the Common Fields topic.

Outlet Data

Database Table Name: sw_outlet

Show Columns

Database Names

Size, Type and Units

Defaults and Error Limits

Field Name

Help Text

Database Field

Data Type

Size

Units

Precision

Default

Error Lower Limit

Error Upper Limit

Warning Lower Limit

Warning Upper Limit
Link ID

A unique name or identifier for this outlet.

This name cannot be used by any other network object on the Links grid.

 id Text 254   0          

Start node

The identifier for the upstream node that this outlet (inlet side) is attached to.

us_node_id

Text

254

 

0

 

 

 

 

 

End node

The identifier for the downstream node that this outlet (outlet side) is attached to.

ds_node_id

Text

254

 

0

 

 

 

 

 

Branch ID

Numeric field used to identify to which long section the link is associated.

Can be set manually or automatically (see Defining Branches topic for more information).

branch_id

Long Integer

 

 

0

 

0

 

0

 
Outlet height The height of the outlet above the Start node (upstream node) invert. start_level Double   Z 3          
Flap valve A check box which determines whether or not the orifice contain a flap gate. Unchecked (no gate) by default. flap_gate Boolean     0 False        
Rating curve type

The type of head-flow relationship. Choices are:

  • Functional/Depth - the relationship is described using the following power function:

    Q = AyB

    Where:

    Q is Flow

    A is a coefficient set in the Coef of outlet function field

    y is the depth of water above the outlet's opening at the inlet node

    B is the exponent set in the Exp of outlet function field

  • Functional/Head - the relationship is described using the same power function as Functional/Depth except that y is the difference in head across the outlet's node.
  • Tabular/Depth - the relationship is described in a tabulated rating curve of flow versus depth of water above the outlet's opening at the inlet node.
  • Tabular/Head - the relationship is described in a tabulated rating curve of flow versus difference in head across the outlet's node.
 rating_curve_type Text 20   0          
Rating curve

Only displayed when the outlet's Rating curve type is set to Tabular/Depth or Tabular/Head.

The name of the curve which defines the relationship between depth or head difference and flow rate.

Any rating curves already defined can be selected from the dropdown list. Alternatively, a new one can be added or an existing one modified using the button located to the left of the field. This displays the non-visual object menu, from which you can select the appropriate option.

 head_discharge_id Text 254   0 Functional/Depth        
Coef of outlet fucntion

Only displayed when the outlet's Rating curve type is set to Functional/Depth or Functional/Head.

The coefficient (A in the power function) for the functional relationship between depth or head and flow rate.

 discharge_coefficient Double     3 10        
Exp of outlet function

Only displayed when the outlet's Rating curve type is set to Functional/Depth or Functional/Head.

The exponent (B in the power function) used for the functional relationship between depth or head and flow rate.

 discharge_exponent Double     3 0.5        

Object Properties Window

Ancillaries

Links Grid

Property Sheets