Open channel data fields

Open channel data fields can be edited on the Open Channel Grid View of the Links grid or the Open Channel property sheet.

All the fields needed for an open channel are described in this topic.

Further information, including units details, about all the Network Object fields stored in the database can be found in the data fields topics listed in the Network Data Fields topic.

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

The pages on the property sheet are listed below.

Pipe Definition page
Open Channel page
User page - see Common Data Fields topic for details of user fields
Hyperlinks page - see Common Data Fields topic for details of hyperlinks fields
Notes page - see Common Data Fields topic for details of notes fields

Note: Use the scroll bar at the bottom of the table to view its entire content.

Pipe definition data

Database Table Name: wn_open_channel

Field Name

Help Text

Flag

Grid

Property Page

Size

Precision

Units

Database Field

Data Type

Default

Error Lower Limit

Error Upper Limit

Warning Lower Limit

Warning Upper Limit

From Node ID

Name of the From Node for this pipe. You can select the name from the dropdown list of existing nodes, or type the name of a node you have yet to add to the model.

From and To represent the typical direction of flow for the pipe. Flow will not always be in this direction.

YES

us_node_id

Text

To Node ID

Name of the To Node for this pipe.

From and To represent the typical direction of flow for the pipe. Flow will not always be in this direction.

YES

ds_node_id

Text

Area Code

The Area Code parameter is used for closer spatial modelling of demand - each node is allocated to an area and demand can then be factored by area.

The factor is set using the Demand Scaling Editor.

YES

area

Text

Asset ID

For reference only. Designed as a reference to an asset database, but could be used for anything.

YES

asset_id

Text

Has Valve

When enabled, indicates the presence of a isolation valve in the pipe, therefore the pipe can be opened or closed.

YES

iwlive_can_be_closed

Boolean

Shape: Length

The length of the pipe.

YES

length

0.1

1000000

Friction: Type

The formula used for roughness calculations. See Pipe Calculations for more information.

Database Value	Description
CW	Colebrook-White (Moody diagram)	Enter the Ks value for the Colebrook-White equation.
MANNING	Manning’s 1/n	Enter the 1/n value for the Manning's equation. Using 1/n as input to the Manning's equation is a common practice as 1/n is normally a more manageable number
N	Manning’s n	Enter the n value for the Manning's equation

YES

roughness_type

Text

Construction: Material

Link material. Used by the roughness formulae.

YES

material

Text

Construction: Year

Year of installation. Used by the roughness formulae.

YES

year

Integer

WQ Parameters: WQ Bulk Coefficient

The bulk coefficient, kb, is a reaction rate parameter used to calculate the change in concentration of a substance as it reacts with material in the bulk flow. The bulk coefficient has a positive value if the concentration of the substance grows over time, and a negative value if the concentration decays over time.

Note:

Source dependent bulk coefficient values may be specified at individual nodes which may override or scale the pipe Bulk Coefficient value when calculating reaction rates for water that entered the system at the node.

YES

bulk_coeff

-0.5

-10

System Type

For information. Type in a system type or select an option from the dropdown list:

Database Value	Description	Help Text
POTABLE	Potable	System used to transport water of a quality suitable for drinking.
RAW	Raw	System used to transport water used as a source supply for potable water before it has been treated.
RECYCLED	Recycled	System used to transport wastewater effluent that has been treated to provide a non-potable supply suitable for uses such as irrigation.

YES

system_type

Text

Isolation Area

Area identifier used to identify groups of objects to be closed when carrying out a Critical Link Analysis.

YES

isolation_area

Text

Suffix

A suffix added by InfoWorks to ensure that all link Ids are unique

YES

link_suffix

Text

Open channel data

Field Name

Help Text

Flag

Grid

Property Page

Size

Precision

Units

Database Field

Data Type

Default

Error Lower Limit

Error Upper Limit

Warning Lower Limit

Warning Upper Limit

Channel Ends: Invert level Upstream

This is the invert level for the upstream end of the link, measured above system datum. You must enter a value for this field. There is no restriction on whether the upstream or downstream invert level is higher.

YES

Channel Ends: Invert level Downstream

This is the invert level for the downstream end of the link, measured above system datum.

YES

Channel Shape: Name

Select a shape from the drop-down list or type in a shape name.

OEGB	See Shape
OEGN
OREC
OT1:1
OT1:2
OT1:4
OT1:6
OT2:1
OT4:1
OU

YES

Channel Shape: Width

Width value used to calculate cross sectional geometry of the conduit. For trapezoidal channels this is the bed width. For other open channels this is the width at the top of the channel lining, or at the maximum design water level.

YES

Channel Shape: Height

Height value used to calculate cross sectional geometry of the conduit. For open channels this is the height to the top of the channel lining, or to the maximum water level.

YES

Inlet: Invert

The level at which the inlet orifice comes into operation.

YES

Inlet: Orifice Diameter

Diameter of circular orifice. You should use the diameter of equivalent area for non-circular orifices.

YES

Outlet: Weir Crest

The level at which the weir first comes into operation.

YES

Outlet: Weir Width

The width of the rectangular weir.

YES

Outlet: Weir Length

The distance across the flat part of the top of the weir measured parallel to the direction of flow.

YES

Results

All results fields are displayed on the grid when opened while viewing a replay of a simulation, and on a special results page placed at the front of Property Sheets displayed while viewing a simulation replay.

For details of results fields for links, see the Link Results Data Fields topic.