Flume Data Fields

Flumes are effectively constrictions in a channel or pipe. They are usually used to allow you to make accurate flow measurements.

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

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

This table describes all the flume specific data which can be used to define a flume. For details of results fields, see the Link Results Data Fields topic.

Common Data Fields

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

Flume Data

Database Table Name: hw_flume

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

Invert level

The Invert level is the level above datum of the top of the hump (assuming the flume has a hump in the throat). Hump height is then calculated as Invert level minus Upstream Invert.

If the flume has no hump it is the level above datum of the centre of the throat.

invert

Double

 

Z

3

 

-9999

9999

 

6000

Throat width

The width across the narrow part of the flume.

For trapezoidal flumes, the bed width should be used. The width of a U-shaped flume is also the diameter of the semi-circular invert.

width

Double

 

L

3

 

0.1

 

 

 

Throat length

The length of the straight sided part of the throat

length

Double

 

L

3

 

0

 

 

 

Side slope

Only relevant for trapezoidal flumes. The two sides of the flume are assumed to have equal slopes. The Side Slope is the ratio of the horizontal distance over the vertical distance.

This means that a vertical side has a Side Slope of zero. As the side approaches horizontal, the Side Slope value approaches infinity.

side_slope

Double

 

 

3

 

0

 

 

 

US node ID

Type in a node reference or choose an existing node reference from the drop down list. This makes up the first part of the link reference

us_node_id

Text

64

 

0

 

 

 

 

 

Link suffix

A single character between A and Z or 0 and 9 which completes the link reference. This allows a node to have up to 36 downstream links. The suffix is automatically allocated by the software.

link_suffix

Text

1

 

0

1

 

 

 

 

DS node ID

Type in a node reference, or choose an existing node reference from the drop down list

ds_node_id

Text

64

 

0

 

 

 

 

 

Link type

The sub-type for this flume. Select from the dropdown list:

Database Value

Description

RFLUME

Rectangular-throated flume

TFLUME

Trapezoidal-throated flume

UFLUME

U-throated flume

link_type

Text

6

 

0

RFLUME

 

 

 

 

System type

Choose the system type from the dropdown list. See System Type for more information

Database Value

Description

Help Text

STORM

Storm Rainfall collection system

FOUL

Foul Wastewater collection system (UK terminology)
SANITARY Sanitary Wastewater collection system (US terminology)
COMBINED Combined Rainfall and wastewater collection system
OVERLAND Overland Overland floodwater collection system
OTHER Other Other system type

system_type

Text

10

 

0

Other

 

 

 

 

Asset ID

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

asset_id

Text

64

 

0

 

 

 

 

 

Sewer reference

An optional reference to identify the sewer of which this conduit is a part

sewer_reference

Text

80

 

0

 

 

 

 

 

Points

This field defines the geometry of the link. The underlying data consists of a series of (x,y) pairs defining the vertices of the link. Each link is made up of a series of straight lines between the defined (x,y) points.

This data is not displayed on the grid or property sheet.

Link Vertice Export

Link vertices are included when you export link data to CSV files. There are two options available for exporting link vertices. These are selected on the Select CSV Export Options Dialog using the Coordinate Arrays Format dropdown list. The options are:

  • Packed - The data is exported as a series of x,y pairs.
  • Separately - the data is appended to the end of the row containing the link data. Each x and y value is in a separate (comma separated) field.

point_array

Array

 

XY

0

 

 

 

 

 

DS settlement efficiency (%)

Closed

Water Quality

This section is relevant only to Water Quality Simulations. If the icon is at the start of a paragraph, then that paragraph is only relevant to water quality simulations. If the icon is at the top of a topic, or a section (underneath a section title), or a row in a table, then the complete topic, section or row is only relevant to water quality simulations.

See US settlement efficiency.

ds_settlement_eff

Long Integer

 

 

0

0

0

100

 

 

US settlement efficiency (%)

Closed

Water Quality

This section is relevant only to Water Quality Simulations. If the icon is at the start of a paragraph, then that paragraph is only relevant to water quality simulations. If the icon is at the top of a topic, or a section (underneath a section title), or a row in a table, then the complete topic, section or row is only relevant to water quality simulations.

The settlement efficiency fields allow you to set the effectiveness of an overflow for trapping out sediment. The overflow is a link (normally a pipe) attached to a node acting as a storage tank (storage node or manhole).

Normally the upstream end of the link will be attached to the node and act as the overflow.

The upstream settlement efficiency determines the efficiency for the overflow.

In some circumstances the link may be reversed (storage tank at the downstream end) and the downstream settlement efficiency will be used.

In many cases an overflow will attach to an outfall from the system.

It would be very unusual to have both upstream settlement efficiency and downstream settlement efficiency set to non-zero values.

The valid range is 0-100%. 0% means the overflow acts as a normal continuation link. 100% means that the overflow traps out as much sediment as possible.

us_settlement_eff

Long Integer

 

 

0

0

0

100

 

 

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

 

 

 

InfoAsset unique ID

Unique ID associated with the corresponding object in an InfoAsset Manager database. When importing from InfoAsset Manager, the InfoAsset ID can be copied from the InfoAsset database in order to maintain links between the two networks.

asset_uid

GUID

 

 

0

 

0

0

0

0

InfoAsset ID

Used to store the ID of the corresponding InfoAsset object when Importing from a Collection Network.

infonet_id Text 40   0          

Flumes

Links Grid

Property Sheets