Node Data Fields (InfoWorks)

A network can include different types of node: manholes, storage structures, ponds, outfalls and breaks. Information relating to a node can be viewed and edited on the Node Grid Window of the Nodes Grid or on the Node Property Sheet, which contains all the properties related to a node.

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

The table below describes all the data which can be used to define a Node. For details of results fields for nodes, see the Node Results Data Fields topic.

Common Data Fields

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

Node Data

Database Table Name: hw_node

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
Node ID A unique name for the node, up to 30 letters, numbers and underscore characters. Upper and lower case letters are treated as being the same. node_id Text 64   0          
Node type Choose one of the following types of node from the drop-down menu:

Database Value

Description

 

Manhole

Manhole

Node with shaft and chamber storage.

Storage

Storage

Allows you to define your own storage shape using level/plan area pairs.

Break

Break

Can be used to model a change in gradient in a conduit. No storage.

Outfall

Outfall

Node where flow leaves the modelled system - no storage.

Pond

Pond

Similar to a Storage node, the Pond node also supports infiltration to the ground from the sides and the base of the pond.

Outfall 2D

Outfall 2D

Outfall node from which flow discharged to a 2D meshed area. Flow from the 2D area may also enter the 1D model via this node.

Connect 2DConnect 2DA connection node that determines the way a conduit (2D) or linear drainage (2D) type of conduit exchanges flow at the upstream/downstream end vertex.

node_type

Text

10

 

0

Manhole

 

 

 

 

Asset ID

An optional reference - usually the asset database name for this node (if applicable).

asset_id

Text

64

 

0

 

 

 

 

 

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

 

 

 

 

Connection type

Only enabled when Node type is set to Connect 2D.

These are used to determine how flow is to be calculated when a conduit of type Conduit (2D) or Linear drainage (2D) is connected to a Connect 2D type of node.

Choose the connection type from the dropdown list:

Database Value

Description

 Help Text
Closed Closed No flow will be calculated through the edge.
Lost Lost Any flow through the edge is lost. Flow is calculated based on uniform flow conditions.
2D 2D Connected to an element in the 2D surface. The hydraulic variables in the 2D element are used as a boundary condition in the 2D conduit.
Break Break The node connects two conduits of the type Conduit (2D) and/or Linear drainage (2D).

See 2D Conduits for further information.

connection_type

Text

10

 

0

Lost

 

 

 

 

x

The X co-ordinate for the node position.

x

Double

 

XY

1

 

 

 

 

 

y

The Y co-ordinate for the node position.

y

Double

 

XY

1

 

 

 

 

 

Ground level

The ground level of the node, specified relative to a common datum.

Not enabled when Node type is set to Connect 2D.

ground_level

Double

 

Z

3

 

-9999

9999

 

6000

Flood level

Level above which any water depth will be displayed as flooding. This will often be the same as ground level but you may wish to give a basement level, for example.

Not enabled when Node type is set to Connect 2D.

flood_level

Double

 

Z

3

 

-9999

9999

 

6000

Shaft additional storage: user

Allows user defined additional storage to be applied to the manhole shaft.

shaft_area_additional

Double

 

NA

1

0.0

 

 

 

100000

Shaft additional storage: compensation

Used to apply additional storage to the shaft as part of the process of compensating for storage in unmodelled pipes.

You can edit this field yourself, but we recommend that you use the Additional storage: user fields for user defined compensation.

See Compensation for Unmodelled Pipes for more details

shaft_area_add_comp

Double

 

NA

1

 

 

 

 

100000

Shaft additional storage: simplification

Used to apply additional storage to the shaft as part of the process of merging or pruning.

You can edit this field yourself, but we recommend that you use the Additional storage: user fields for user defined compensation.

See Storage Compensation during Merging and Pruning for more details

shaft_area_add_simplify

Double

 

NA

1

 

 

 

 

100000

Shaft additional storage: correction

Used to apply additional storage to the shaft as part of the process of mathematical correction.

You can edit this field yourself, but we recommend that you use the Additional storage: user fields for user defined compensation.

See Preissmann Slot and Baseflow Correction for more details

shaft_area_add_ncorrect

Double

 

NA

1

 

 

 

 

100000

Chamber additional storage: user

Allows user defined additional storage to be applied to the manhole chamber.

chamber_area_additional

Double

 

NA

1

0.0

 

 

 

100000

Chamber additional storage: compensation

Used to apply additional storage to the chamber as part of the process of compensating for storage in unmodelled pipes.

You can edit this field yourself, but we recommend that you use the Additional storage: user fields for user defined compensation.

See Compensation for Unmodelled Pipes for more details

chamber_area_add_comp

Double

 

NA

1

 

 

 

 

100000

Chamber additional storage: simplification

Used to apply additional storage to the chamber as part of the process of merging or pruning.

You can edit this field yourself, but we recommend that you use the Additional storage: user fields for user defined compensation.

See Storage Compensation during Merging and Pruning for more details

chamber_area_add_simplify

Double

 

NA

1

 

 

 

 

100000

Chamber additional storage: correction

Used to apply additional storage to the chamber as part of the process of mathematical correction.

You can edit this field yourself, but we recommend that you use the Additional storage: user fields for user defined compensation.

See Preissmann Slot and Baseflow Correction for more details

chamber_area_add_ncorrect

Double

 

NA

1

 

 

 

 

100000

Chamber roof level

The manhole chamber area applies up to this level. Above this level, the manhole shaft area applies up to ground level. The default is the maximum of all soffit levels (of conduits or orifices connected to this node) or pump switch-on levels for wet wells or levels of other connected controls.

chamber_roof

Double

 

Z

3

 

-9999

9999

 

6000

Chamber floor level

The base of the manhole chamber. The chamber area applies between this level and the chamber roof.

The default is either:

  • the minimum of all invert levels (for any conduits and/or channels connected to the node)
  • the minimum of all inverts minus 1cm (for any orifices, flap valves, sluice gates, weirs, flumes, screens, user-defined controls, culvert inlets, culvert outlets, and/or siphons connected to the node)
  • switch-off levels minus 10cm (for any pumps connected downstream of the node)

Where a link has both an upstream and downstream invert defined, ICM uses the invert of the one nearest the node. When a link has only a single invert then this will be used. For user-defined controls type of link, the initial level is used as the invert. For weirs, screens and siphons, ICM uses the crest as the invert.

chamber_floor

Double

 

Z

3

 

-9999

9999

 

6000

Chamber plan area

The manhole storage area between the chamber floor and the chamber roof.

The default is calculated as:

 

 

where:

A = default area

W = width of widest link incoming or outgoing

chamber_area

Double

 

NA

1

 

0

 

 

 

Shaft plan area

The manhole storage area between the chamber roof and ground level.

The default is calculated as:

 

 

where:

A = default area

W = width of widest link incoming or outgoing

shaft_area

Double

 

NA

1

 

0

 

 

 

Flood type

Note for Storage Nodes : Unlike manholes, storage nodes do not include any alteration of the flood cone or stage / area characteristics to account for transition. If the last stage value is below ground level, the storage node is treated as sealed. If the last value is the same as ground level then it is lost. If it is above then it is stored, in which case the flood cone rises vertically and has an area equal to the last defined plan area.

Choose one of the following from the drop-down menu:

Database Value

 Description

Sealed

The water level can rise indefinitely without any flooding occurring.

Stored

The flood water on the catchment surface is retained in the storage volume defined by the flood levels and areas specified below. The flood water returns to the drainage system as the levels drop.

Lost

Flood water is lost from the system.

Gully

The flood water on the catchment surface is retained in a storage volume defined in the Level / Plan Area Grid on the Storage Parameters Page. The discharge between surface storage and manhole is defined by a Head Discharge Table.

2D

The discharge between surface storage (on the 2D mesh) and manhole is calculated using standard weir equations, where the weir width is taken as the circumference of the manhole.

Gully 2D

The discharge between surface storage (on the 2D mesh) and manhole is defined by a Head Discharge Table.
Inlet The discharge between surface storage and manhole is defined by user defined inlet parameters. See Inlet Nodes for further details.
Inlet 2D The discharge between surface storage (on the 2D mesh) and manhole is defined by user defined inlet parameters. See Inlet Nodes for further details.

flood_type

Text

8

 

0

 

 

 

 

 
Benching method

Benching method options:

Database Value
Depressed
Flat
Half Benching
Full Benching
Improved

Access hole benching methods (Figure 7-6 FHWA HEC 22 Urban Drainage Manual)

 benching_method Text 13   0 Full Benching        

2D element area factor

Enabled when Flood type is set to 2D or Gully 2D.

Multiplying factor applied to manhole Shaft plan area to determine effective area of a 2D manhole.

The effective area is used when creating a 2D mesh to ensure that flow feeding into each 2D manhole comes from a single element.

Mesh triangles at each 2D manhole will be aggregated to form an element with an area that is at least the effective area of the manhole.

element_area_factor_2d

Double

 

 

1

1

1

 

 

 

Floodable area

The total area that can store flood water for this node.

If the default (#D) flag is set, the default value is the sum of the contributing areas of all subcatchments draining to the node.

floodable_area

Double

 

CA

3

 

0

 

 

 

Flood depth 1

The depth at which the flood water spreads over flood area 1.

flood_depth_1

Double

 

Y

1

 

0

 

 

 

Flood depth 2

The depth at which the flood water spreads over flood area 2.

flood_depth_2

Double

 

Y

1

 

0

 

 

 

Flood area 1 (%)

The percentage of the floodable area acting as the first part of a double conical flood storage volume. The first cone extends from the manhole area at ground level to this area at flood level 1.

flood_area_1

Long Integer

 

 

0

 

0

100

 

 

Flood area 2 (%)

The percentage of the floodable area acting as the second part of a double conical flood storage volume. The second cone extends from flood area 1 at flood level to this area at flood level 2.

flood_area_2

Long Integer

 

 

0

 

0

100

 

 

Flooding discharge coefficient

Discharge coefficient for weir flow equations used for 2D flooding nodes.

flooding_discharge_coeff

Double

 

 

2

0.5

0.01

 

 

 

Chamber additional storage: total

The total from the four Chamber Additional Storage fields. See above for more information.

chamber_area_additional_total

Double

 

NA

1

 

 

 

 

 

Gully head discharge table

Add a New table or select a table from the dropdown list and click the Properties button to view the Head Discharge Table Property Sheet.

Use the grid to enter the Head / Discharge pairs that define the discharge between the surface storage area and the manhole part of the node.

head_discharge_id

Text

64

 

0

 

 

 

 

 

Number of gullies

A scaling factor used to multiply the discharge values of the Head / Discharge Table.

n_gullies

Double

 

 

3

1

0

 

0

 

Relative stages

Check this box to define the Level values entered in the Level / Plan Area Grid as relative to Ground level.

If this box is unchecked, the Level values are taken to be level above system datum.

relative_stages

Boolean

 

 

0

False

1

 

 

 

Storage array

If the Node type is set to Pond or Storage, then this array represents the storage capacity of the node.

Note

When running a simulation, porosity is applied as a factor on area, but only for storage array entries that are at or below ground level. If you have a storage array with one level significantly below ground level and the next above, this may cause unexpected results.
This will not apply to manholes as they should always have a level entry at ground level.

 

If Node type is set to Manhole and the Flood type is set to Gully or Inlet, then this array represents the volume above the surface.

The parameters for the array are entered on a Storage Array dialog which is displayed by clicking on the button.

Database Table Name: hw_node_storage

Show Columns

Database Names

Size, Type and Units

Defaults and Error Limits

Position in Data Structure

Field Name

Help Text

Database Field

Data Type

Size

Units

Default

Error Lower Limit

Error Upper Limit

Warning Lower Limit

Warning Upper Limit
1 Level

The depth used for the calculation of the storage capacity or volume.

If the Relative stages box is checked, then this level is relative to the Ground Level. Otherwise, it is taken to be the level above system datum.

If the Plan Area at the lowest point is greater than zero, the reservoir is assumed to be flat bottomed.

 Level Double   Z   -9999 9999   6000
2 Area The area used for the calculation of the storage capacity or volume. Area Double   NA   0      
3 Perimeter The shape of a pond node (Node type set to Pond). Perimeter Double   L   0      

storage_array

Array

 

 

0

 

0

0

0

0

Liner level

Level to which pond is lined. Liner infiltration coefficient will be applied between lowest stage in the Storage level array and Liner Level.

Default value is the level of the lowest stage in the Perimeter array.

liner_level

Double

 

Z

3

0

 

 

 

 

Vegetation level

Level at which vegetation starts. Vegetation infiltration coefficient will be applied above the Vegetation level.

Default value is the invert of the lowest attached link.

vegetation_level

Double

 

Z

3

0

 

 

 

 

Infiltration loss coefficient above vegetation

The rate of infiltration from the pond into the ground, applicable above the Vegetation level of the pond.

Default value is value of Infiltration coefficient above liner.

infiltratn_coeff_abv_vegn

Double

 

I

2

 

0

 

0

36000

Infiltration loss coefficient above liner

The rate of infiltration from the pond into the ground, applicable between the Liner level and the Vegetation level of the pond.

Default value is 0.

infiltratn_coeff_abv_liner

Double

 

I

2

0

0

 

0

36000

Infiltration loss coefficient below liner

The rate of infiltration from the pond into the ground, applicable below the Liner level.

Default value is 0.

infiltratn_coeff_blw_liner

Double

 

I

2

0

0

 

0

36000

Base area

The area of the base of the SUDS structure. This is the area through which water infiltrates into the ground from a 2d structure

Used for modelling SUDS structures

base_area

Double

 

NA

2

 

0

 

0

 

Perimeter

The perimeter length for the SUDS structure. All 2d structures will have a Perimeter of 0 because no infiltration takes place through the sides of the structure. For 3d structures, the Perimeter * structure depth represent the area for infiltration through the sides.

The actual area for infiltration at any point in the simulation is Base Area + (Perimeter * water level in the structure).

Used for modelling SUDS structures

perimeter

Double

 

L

3

0

0

 

0

 

Infiltration loss Coefficient

The rate of infiltration from the structure into the ground. Infiltration is given by Actual Infiltration Area * Infiltration Coefficient.

Used for modelling SUDS structures

infiltration_coeff

Double

 

I

2

0

0

 

0

 

Porosity

Some SUDS structures are filled with stones or gravel for example. The Porosity represents this infill. A Porosity of 0.3 represents 30% air volume in the structure (70% of the volume is taken up by fill material).

This infill will affect the water level in the structure.

Used for modelling SUDS structures

porosity

Double

 

 

3

1

0.001

1

0.001

1

Inlet type

Type of inlet being modelled:

Node Type

Description

 Help Text

ContCO

Continuous curb opening

Curb-opening inlet on a continuous slope.

(Method of calculation uses equations from the FHWA HEC 22 Urban Drainage Manual.)

ContG

Continuous grate

Grate inlet on a continuous slope.

(Method of calculation uses equations from the FHWA HEC 22 Urban Drainage Manual.)
SagC Sag combination

Combination inlet in a dip in the road.

(Method of calculation uses equations from the FHWA HEC 22 Urban Drainage Manual.)
SagCO Sag curb opening

Curb-opening inlet in a dip in the road.

(Method of calculation uses equations from the FHWA HEC 22 Urban Drainage Manual.)
SagG Sag grate

Grate inlet in a dip in the road.

(Method of calculation uses equations from the FHWA HEC 22 Urban Drainage Manual.)
UPC Grate UPC Grate

Grate inlet on a continuous slope.

(Method of calculation uses equations from the work carried out by Gomez, M. and Russo, B. (2011).)

inlet_type

Text

30

 

0

SagC

 

 

 

 

Inlet input type

Calculation option for inlet:

Node Type

Description

 Help Text
EQU User equation

Use equation to calculate flow through inlet in the form of:

Q=ayb

Where:

Q = flow

a = constant defined in User Equation A value field

y = depth of flow at inlet

b = constant defined in User Equation B value field

FLowEff Flow efficiency

Use a Flow Efficiency Table to calculate flow through inlet.

Applicable to continuous outlets only

HeadD Head discharge Use a Head Discharge Table to calculate flow through inlet
Params Inlet Parameters

Use equations from Gomez, M. and Russo, B. (2011) to calculate inlet efficient for UPC Grate.

Use FHWA HEC 22 Urban Drainage Manual equations to calculate inlet efficiency for all other inlet types.

inlet_input_type

Text

30

 

0

Params

 

 

 

 

Inlet head discharge table

Select an existing Head Discharge Table from the dropdown list or click the arrow button to create a new table.

Head / Discharge pairs define the discharge between the surface storage area and the manhole part of the node.

Required for inlet nodes when Inlet input type is set to HeadD.

head_discharge_id

Text

64

 

0

 

 

 

 

 

Inlet flow efficiency table

Select an existing Flow Efficiency Table from the dropdown list or click the arrow button to create a new table.

Flow / Efficiency pairs define the efficiency of interception of flow at the node at varying flow values.

Required for inlet nodes when Inlet input type is set to FlowEff.

flow_efficiency_id

Text

64

 

0

 

 

 

 

 

User equation A value

Required when Inlet input type is set to EQU.

Constant used in equation to calculate flow through inlet:

Q=ayb

Where:

Q = flow

a = constant defined in User equation A value field

y = depth of flow at inlet

b = constant defined in User equation B value field

inlet_UE_a

Double

 

 

3

0.000

0

 

0

 

User equation B value

See User equation A value

inlet_UE_b

Double

 

 

3

0.000

0

 

0

 
Cross slope

Rate of change of roadway elevation with respect to distance perpendicular to the direction of travel. Also known as transverse slope.

Required for inlet nodes when Inlet input type is set to Params.

cross_slope

Double

 

 

3

0.000

0

 

0

 
Grate width

Grate dimension

Required for Inlet type of Continuous grate, Sag grate, Sag combination and UPC grate when Inlet input type is set to Params.

grate_width

Double

 

L

3

0.000

0

 

0

 
Grate length

Grate dimension

Required for Inlet type of Continuous grate, Sag grate, Sag combination and UPC grate when Inlet input type is set to Params.

grate_length

Double

 

L

3

0.000

0

 

0

 
Gutter depression

Depth of gutter depression. Used when modelling a depressed inlet.

Required for Inlet type of Sag curb-opening and Continuous curb-opening when Inlet input type is set to Params.

gutter_depression

Double

 

L

3

0.000

0

 

0

 
Opening length

Length of curb opening.

Required for Inlet Type of Continuous Curb-Opening, Sag Curb-Opening and Sag Combination when Inlet Input Type is set to Params.

opening_length

Double

 

L

3

0.000

0

 

0

 
Opening height

Height of curb opening.

Required for Inlet Type of Sag Curb-Opening and Sag Combination when Inlet Input Type is set to Params.

opening_height

Double

 

L

3

0.000

0

 

0

 
Lateral depression

Lateral width of gutter depression. Used when modelling a depressed inlet.

Required for Inlet type of Sag curb-opening and Continuous curb-opening when Inlet input type is set to Params.

lateral_depression

Double

 

L

3

0.000

0

 

0

 
Splashover velocity

Velocity at which water first begins to splash over inlet grate.

Required for Inlet type of Continuous grate when Inlet input type is set to Params.

velocity_splashover

Double

 

V

3

0.000

0

 

0

 
Weir behaviour depth

Depth of water up to which grate inlet behaves as a weir. Above this depth the inlet will be modelled as an orifice.

Required for all Sag inlet types when Inlet input type is set to Params.

Default set to 1.4 x Opening height for Inlet type of Sag curb-opening and Sag combination.

Default set to 0.0 for Inlet type of Sag grate.

 depth_weir

Double

 

L

3

0.000

0

 

0

 
% Clogging

Factor used to model the effect of clogging from debris.

Represents percentage reduction in the width of the grate when Inlet type is Sag grate or Sag combination.

Represents percentage reduction in flow when Inlet type is Continuous grate.

debris

Double

 

 

3

0.000

0

 

0

 
Clear opening

Clear area of grate or opening.

Required for all Sag inlet types when Inlet input type is set to Params.

clear_opening

Double

 

NA

3

0.000

0

 

0

 
Area of voids

Area of grate voids.

Required when Inlet type is UPC grate and Inlet input type is set to Params.

area_of_voids Double   NA 0          
Minimum area including voids

Area of smallest rectangle having sides parallel to the kerb containing all the void areas of the grate (including the area occupied by the bars).

Required when Inlet type is UPC grate and Inlet input type is set to Params.

min_area_inc_voids Double   NA 0          
Number of transverse bars

Number of grate bars perpendicular to the kerb.

Required when Inlet Type is UPC grate and Inlet input type is set to Params.

num_transverse_bars Long Integer     0   0 255    
Number of diagonal bars

Number of grate bars diagonal to the kerb.

Required when Inlet type is UPC grate and Inlet input type is set to Params.

num_diagonal_bars Long Integer     0   0 255    
Number of longitudinal bars

Number of grate bars parallel to the kerb.

Required when Inlet type is UPC Grate and Inlet Input Type is set to Params.

num_longitudinal_bars Long Integer     0   0 255    
Half road width

Half the full width of the road (it is assumed that there will be gullies along both kerbs).

Required when Flood type is Inlet 2D, Inlet type is UPC grate and Inlet input type is set to Params.

half_road_width Double   L 3          

InfoAsset Unique ID

 Unique ID associated with the corresponding object in an InfoAsset Manager database. When importing from InfoAsset Manager, the InfoAsset Unique ID can be copied from the InfoAsset Manager 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 Manager object when Importing from a Collection Network.

 infonet_id Text 40   0          
1D-2D linkage basis

Choose the basis for the transfer of flow from the drop-down list:

  • Depth to use the depth in 2D zones to set the water level at nodes connected to the 2d zone. This is the recommended approach where the ground model is consistent with the specified elevation of the node.
  • Elevation to use the elevation in 2D zones to set the water level at nodes connected to the 2D zone. This may help to avoid oscillating flows caused by ground level discrepancy between manholes and 2D mesh elements.

If left blank, the setting of Use 2d elevations instead of depths field in the simulation parameters is used.

 2d_link_type Text 12   0 Depth        

Nodes

Property Sheets

Nodes Grid