Basic node data fields

Basic node data fields can be edited on the Node Grid View of the Nodes Grid or the Node Property Sheet.

The following table describes all the data needed to define a Basic Node.

Further information, including units details, about all the Network Object fields stored in the Master 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. When the network object has Control Data or Alternative Demand Data additional pages may be displayed on the property sheet. These pages are marked as follows:

- additional page displayed when Control Data is open

- additional page displayed when Alternative Demand Data is open

Node Definition page
Node Demand page
Customer Points page
Land Use page
User page - common page
Hyperlinks page - common page
Notes page - common page
Alternative Demand page
Alternative Customer Points page
Alternative Land Use page
Node Control page
Water Quality Profile page
Water Quality Turbidity Profile page
Exceptional Flow Profile page
Hydrant Flow Profile page
Cost Management page - only displayed when the Show Cost Management fields option is selected in the BalanceNet page of the Options dialog
Transient - Surge Protection Device page - fields only enabled when InfoWorks TS (Transient System) licence is present
Transient - Additional Demand page - fields only enabled when InfoWorks TS (Transient System) licence is present
Control Notes page

Node Data

Database Table Name: wn_node

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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

Node ID

Name of the node

YES

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

Fire Zone

The Fire Zone field is used when checking minimum pressure constraints during Hydrant Testing simulations. Different pressure constraints may be applied to nodes in a given Fire Zone to nodes outside of the Fire Zone. See Fire Flow Data for more details.

YES

fire_zone

Text

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

X coordinate

YES

Double

Y coordinate

YES

Double

Elevation

Elevation above datum of pipe invert.

YES

Double

-999

9999

Ground Level

Elevation above datum of ground surface.

YES

ground_level

Double

-999

9999

Highest Property Level

Elevation above datum level of the highest property supplied by the node

YES

highest_property

Double

-999

9999

Demand By Category

Displayed on Node Demand Page only.

The Demand box contains a grid where you can define the Existing Demand for the node. Total demand, or demand per property is defined for each User Category supplied from the node.

The demand grid can only be edited from the Node Demand Page so full details on using this grid are included there.

Database Table Name: wn_node_demand_by_category

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	Size, Type and Units
	Database Names
	Error Limits

Position in Data Structure

Field Name

Help Text

Flag

Size

Units

Database Table

Database Field

Type

Default

Error Lower Limit

Error Upper Limit

Warning Lower Limit

Warning Upper Limit

Demand Category

The name of the Demand Category. If there is a current Demand Diagram, the dropdown list will be filled with the categories for the current Demand Diagram. Or you can type in a category name.

There are two special Demand Category names:

If the Demand Category field is left blank or CONST is entered, a constant demand profile is assumed.
If CONST_LEAKAGE is entered in this field, a constant leakage profile is assumed.

YES

wn_node_demand_by_category

category_id

Text

Specific Consumption

The consumption for each property in this category

YES

WN_QD

wn_node_demand_by_category

spec_consumption

Average Demand

The average demand from this node for all properties in the category

YES

WN_DQ

wn_node_demand_by_category

average_demand

Number Of Properties

The number of properties in this category

YES

wn_node_demand_by_category

no_of_properties

Direct Demand Factor

A factor applied to a demand category created as Direct demand to adjust the demand category values.

Note: A Direct Demand Factor should only be used with demand categories created as Direct demand. If a Direct Demand Factor is applied to a Factored demand category, it will be ignored. See Editing Demand Diagrams for more details.

The factor will normally be 1.0

YES

wn_node_demand_by_category

direct_demand

Source

Database Value	Description
0	Customer Point
1	Land Use Area
2	User Defined

wn_node_demand_by_category

source

Integer

Category Type

Database Value	Description
0	Property
1	Average
2	Direct

YES

wn_node_demand_by_category

category_type

Integer

YES

demand_by_category

Array

Leakage Loss

Flow loss via leakage. Runs at a constant rate during the simulation

YES

WN_DQ

leakage_loss

Nominal Pressure

Average pressure value used for Pressure Related Demand simulations.

The value of demand corresponds to standard service pressure - average pressure in normal circumstances. This parameter allows you to state the likely value of service pressure for each node.

If the pressure available at each node differs from its set value during the simulation,all demands will be changed accordingly (the lower the pressure, the lower the consumption or loss on the node).

This adjustment of demand and loss is only activated when the Pressure Related Demand option is checked in the Schedule Hydraulic Run View and percentage of demand that is pressure related has been defined in the Demand Diagram.

Tne Nominal Pressure data field can be updated automatically from previous simulations. See Updating Nominal Pressures for more information.

Please Note

You are advised to experiment carefully with this option since it is dependent on accurate ground levels and working pressures. The feature has been included since it is obviously important in practice but with a warning to the user to proceed with care! Bear in mind that with the pressure-related demand option activated, total demand cannot be predicted accurately

YES

WN_P

nominal_average_pressure

Total Conns

The number of customer connections attributed to node. This field can be automatically populated by using the Set Total Connections option from the Model menu.

YES

total_connections

Total Demand

The total demand at a node averaged over 24 hours; calculated using the current Demand Diagram.

Please Note

The value reported in the Total Demand field will depend on whether a Demand Diagram is open, and whether demand categories assigned to nodes are present in the current Demand Diagram.

Demand Diagram / Demand Category Status

Total Demand Value

No Demand Diagram open

None

Demand Diagram open:

Demand category that is not present in current Demand Diagram assigned to node.

"Unknown"

Demand Diagram open:

All demand categories assigned to node present in current Demand Diagram.

Total Averaged Demand on node

YES

WN_DQ

total_demand

Land Use Areas

Database Table Name: wn_node_landuse_areas

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	Database Names
	Error Limits

Position in Data Structure	Field Name	Help Text	Flag	Size	Units	Database Table	Database Field	Type
1	Land Use Demand ID	Land Use ID	YES	30		wn_node_landuse_areas	landuse2_id	Text
2	Area	Area	YES		WN_PA	wn_node_landuse_areas	area
3	Land Use Area	Proportion of Land Use Total Area	YES		WN_PA	wn_node_landuse_areas	proportion
4	Polygon ID	Polygon Name. Demand values specified at this polygon will override the demand values specified at the Land Use object.	YES	30		wn_node_landuse_areas	polygon_id	Text

YES

landuse_areas

Array

InfoNet Unique ID

The InfoNet Unique ID and InfoNet Network ID are unique identifiers associated with the corresponding object and network in an InfoAsset database. When importing from InfoAsset, these identifiers can be copied from the InfoAsset database in order to maintain links between the two networks.

YES

asset_uid

GUID

InfoNet Network ID

See InfoNet Unique ID

YES

asset_network_uid

GUID

Basic Node Alternative Demand Data

The Alternative Demand Property Pages are displayed when an Alternative Demand is associated with the Network.

For details of alternative demand data fields, see the Alternative Demand Data Fields topic.

Basic Node Control Data

Database Table name: wn_ctl_node

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	Database Names
	Error Limits

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

Live Data Point ID

Name of the associated Live Data Point

YES

100

live_data_point_id

Text

Keep Local Demand

This checkbox decides whether local demand is to be applied to the node during the simulation

checked - any demand assigned to the node on the Node Demand Page (eg customer point demand), will be applied in addition to any Exceptional Flow and Hydrant Flow
unchecked - The only demand that will be applied to the node will be any Exceptional Flow and Hydrant Flow. (At any time step when Exceptional Flow is zero and Hydrant Opening is 0%, local demand will be applied).

YES

keep_local_demand

Boolean

Initial Concentration

The initial concentration of the substance being tested at the start of the simulation. Only one substance can be tested at a time.

Basic Nodes, Hydrant nodes and Reservoirs

The figure is an initial concentration. This will be washed away over time

Fixed Head and Transfer Nodes

These nodes are inputs to the system. The Initial Concentration represents a continuous input concentration over the period of the simulation

If you have defined a time dependent concentration for a node, the time dependent concentration overrides this value between it's start and end times.

There are no Water Quality controls for Hydrant Nodes. Hydrant nodes are output only nodes.

YES

WN_C

initial_concentration

9999

Source Type

Method by which concentration profile defined in the Water Quality grid is applied during the simulation.

Database Value	Description	Help Text
0	Fixed Concentration	Concentration at a node is set to the profile defined in the Water Quality grid. Use a concentration value of < 0 in the profile to switch off the concentration source and allow inflow from upstream pipes to set concentration at the node.
1	Additional Concentration	Concentration profile defined in the Water Quality grid is applied to water leaving the node in addition to the calculated concentration.
2	Concentration Booster	Concentration in water leaving the node is set to the profile defined in the Water Quality grid (provided that the concentration calculated during the simulation is less than the defined concentration).
3	Additional Mass Flow	Mass Flow profile defined in the Water Quality grid is applied to water leaving the node in addition to the calculated concentration.

YES

wq_source_type

Integer

Initial Age of Water (hr)

Age of water at the start of the simulation.

YES

initial_age

Double

Water Quality Concentration profile

A concentration profile is entered in the water quality grid when Source Type is set to Fixed Concentration, Additional Concentration or Concentration Booster.

The concentration of pollutant entering the system at this node between the Water Quality start and end times. This concentration does not depend on flow rate. These values can be interpolated, depending on the state of the Linear WQ Profile check box.

Database Table Name: wn_ctl_node_wq_conc

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Position in Data Structure	Field Name	Help Text	Flag	Size	Units	Database Table	Database Field	Type	Default	Error Lower Limit	Error Upper Limit	Warning Lower Limit	Warning Upper Limit
1	Date Time	The date and time at which the concentration value takes effect.	NO			wn_ctl_node_wq_conc	wqc_date_time
2	Conc.	The concentration of pollutant entering at this node at this time	NO		WN_C	wn_ctl_node_wq_conc	wqc_concentration		0.0		9999

YES

wq_profile

Array

Water Quality Mass Flow profile

A mass flow profile is entered in the water quality grid when Source Type is set to Additional Mass Flow.

Database Table Name: wn_ctl_node_wq_flow

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Position in Data Structure	Field Name	Help Text	Flag	Size	Units	Database Table	Database Field	Type	Default	Error Lower Limit	Error Upper Limit	Warning Lower Limit	Warning Upper Limit
1	Date Time	The date and time at which the mass flow value takes effect.	NO			wn_ctl_node_wq_flow	wqf_date_time
2	Mass Flow	The mass flow rate of pollutant entering at this node at this time	NO		WN_MF	wn_ctl_node_wq_flow	wqf_additional_mass		0.0	0	9999

YES

wq_flow_profile

Array

Linear WQ Profile

This checkbox decides if values in the profile grid are interpolated.

checked - linear interpolation is carried out between values
unchecked - The value entered in the grid changes at each time point, and is maintained until the next time point is reached.

YES

linear_wq_profile

Boolean

Before First Point (water quality)

Database Value

Description

Help Text

Extend Back

The first value in the profile grid is extended back to the start of the simulation (and repeat period for repeated profiles).

Extrapolate Back

Applies to Linear Profiles only: the first two values in the profile grid are used to extrapolate back to the start of the simulation (and repeat period for repeated profiles).

(If Extrapolate Back is selected for a non linear profile, the profile will be extended back.)

Zero/Unchanged

A value of zero or "off" is applied from the start of the simulation until the date / time of the first value in the profile grid (and from the start of the repeat period for repeated profiles).

YES

before_wq_profile

Integer

After Last Point (water quality)

Database Value

Description

Help Text

Extend Forward

The last value in the profile grid is extended to the end of the simulation or repeat period.

Extrapolate Forward

Applies to Linear Profiles only: the last two values in the profile grid are used to extrapolate forward to the end of the simulation or repeat period.

(If Extrapolate Forward is selected for a non linear profile, the profile will be extended forward.)

YES

after_wq_profile

Integer

Repeat Profile (water quality)

Check the Repeat Profile box to repeat a profile (from 00:00 for the selected Repeat Period) for the duration of the simulation.

IMPORTANT

When using the Repeat Profile option; if the defined profile spans over the selected Repeat Period, the profile will not be repeated.

YES

repeat_wq_profile

Boolean

Repeat Period (water quality)

Profile period which will be repeated throughout simulation, if the Repeat Profile box is checked.

Database Value	Description	Help Text
0	1 day	Repeat Period
1	1 week	Repeat Period
2	2 weeks	Repeat Period

YES

repeat_wq_period

Integer

Water Quality

A read only check box displayed only on the grid view. This box is checked if data has been entered in the Water Quality Grid on the property sheet

YES

wqc_selected

Boolean

Bulk Coeff Mode

Method by which Bulk Coefficient is applied to water entering the system at the node:

Database Value

Description

Help Text

Not active

Bulk coefficient for the node is not applied to water entering the system at the node.

WQ bulk coefficient values specified at individual pipes will be used to calculate change in concentration.

Replace

The Bulk coefficient specified at the node will override the WQ bulk coefficient values specified at individual pipes when calculating change in concentration.

Scale

The Bulk coefficient specified at the node will be applied as a multiplying factor to WQ bulk coefficient values specified at individual pipes.

YES

wq_bulk_coeff_mode

Integer

Bulk Coeff

Reaction rate parameter used to calculate the change in concentration of a substance as it reacts with material in the bulk flow.

The value specified here is applied to water entering the system at the node.

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.

YES

wq_bulk_coeff

Double

Res Bulk Coeff Mode

Method by which Res Bulk Coefficient is applied to water entering the system at the node:

Database Value

Description

Help Text

Not active

Res bulk coefficient for the node is not applied to water entering the system at the node.

WQ reaction coefficient values specified at individual reservoirs will be used to calculate change in concentration.

Replace

The Res bulk coefficient specified at the node will override the WQ reaction coefficient values specified at individual reservoirs when calculating change in concentration.

Scale

The Res bulk coefficient specified at the node will be applied as a multiplying factor to WQ Reaction coefficient values specified at individual reservoirs.

YES

wq_res_bulk_coeff_mode

Integer

Res Bulk Coeff

Reaction rate parameter used to calculate the change in concentration of a substance as it reacts with material in a reservoir.

The value specified here is applied to water entering the system at the node.

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.

YES

wq_res_bulk_coeff

Double

Time Dependent Concentration

This field is obsolete and is not displayed in the interface. This data is now entered in the Water Quality Grid.

The field is maintained for backwards compatibility with old CSV data files. If this value is set when the data is imported, InfoWorks will calculate appropriate values for the Water Quality Grid.

YES

WN_C

time_related_concentration

9999

WQ Start Date & Time

This field is obsolete and is not displayed in the interface. This data is now entered in the Water Quality Grid.

The field is maintained for backwards compatibility with old CSV data files. If this value is set when the data is imported, InfoWorks will calculate appropriate values for the Water Quality Grid.

YES

wq_start_date_time

WQ End Date & Time

This field is obsolete and is not displayed in the interface. This data is now entered in the Water Quality Grid.

The field is maintained for backwards compatibility with old CSV data files. If this value is set when the data is imported, InfoWorks will calculate appropriate values for the Water Quality Grid.

YES

wq_end_date_time

Initial Turbidity

Initial turbidity at node at start of simulation.

See Water Quality - Turbidity Analysis for further information.

YES

WN_TURBIDITY

wq_initial_turbidity

Single

9999

Turbidity Source Type

Method by which turbidity profile defined in the Turbidity grid is applied during the simulation.

Database Value

Description

Help Text

Fixed Turbidity

Turbidity at node is set to the profile defined in the Turbidity grid.

Use a turbidity value of < 0 in the profile to switch off the turbidity source and allow turbidity from upstream pipes to set turbidity at the node.

Additional Turbidity

Turbidity profile defined in the Turbidity grid is applied to water leaving the node in addition to the calculated turbidity.

See Water Quality - Turbidity Analysis for further information.

YES

wq_turb_source_type

Integer

Turbidity Profile

Database Table Name: wn_ctl_node_wq_turb

A series of time / turbidity pairs that define the turbidity profile at the node. These values can be interpolated, depending on the state of the Linear Profile flag.

Show Columns	Help Text
	Size, Type and Units
	Database Names
	Error Limits

Position in Data Structure	Field Name	Help Text	Flag	Size	Units	Database Table	Database Field	Type	Default	Error Lower Limit	Error Upper Limit	Warning Lower Limit	Warning Upper Limit
1	Date Time	Date and time value	YES			wn_ctl_node_wq_turb	wqt_date_time	Date/Time
2	Turbidity	Turbidity at node	YES		WN_TURBIDITY	wn_ctl_node_wq_turb	wqt_turbidity	Single	0.0		9999

See Water Quality - Turbidity Analysis for further information.

wq_turbidity_profile

Array

Linear Turbidity Profile

This checkbox decides if values in the Turbidity profile grid are interpolated:

checked - linear interpolation is carried out between values
unchecked - The value entered in the grid changes at each time point, and is maintained until the next time point is reached.

YES

wq_turb_linear_profile

Boolean

Before First Point (Turbidity)

Database Value

Description

Help Text

Extend Back

The first value in the profile grid is extended back to the start of the simulation (and repeat period for repeated profiles).

Extrapolate Back

Applies to Linear Profiles only: the first two values in the profile grid are used to extrapolate back to the start of the simulation (and repeat period for repeated profiles).

(If Extrapolate Back is selected for a non linear profile, the profile will be extended back.)

Zero/Unchanged

A value of zero or "off" is applied from the start of the simulation until the date / time of the first value in the profile grid (and from the start of the repeat period for repeated profiles).

YES

wq_turb_before_profile

Integer

After Last Point (Turbidity)

Database Value

Description

Help Text

Extend Forward

The last value in the profile grid is extended to the end of the simulation or repeat period.

Extrapolate Forward

Applies to Linear Profiles only: the last two values in the profile grid are used to extrapolate forward to the end of the simulation or repeat period.

(If Extrapolate Forward is selected for a non linear profile, the profile will be extended forward.)

YES

wq_turb_after_profile

Integer

Repeat Profile (Turbidity)

Check the Repeat Profile box to repeat a profile (from 00:00 for the selected Repeat Period) for the duration of the simulation.

IMPORTANT

When using the Repeat Profile option; if the defined profile spans over the selected Repeat Period, the profile will not be repeated.

YES

wq_turb_repeat_profile

Boolean

Repeat Period (Turbidity)

Profile period which will be repeated throughout simulation, if the Repeat Profile box is checked.

Database Value	Description	Help Text
0	1 day	Repeat Period
1	1 week	Repeat Period
2	2 weeks	Repeat Period

YES

wq_turb_repeat_period

Integer

Exceptional Flow

A series of time / flow pairs that define the exceptional flow time varying profile at the node. These values can be interpolated, depending on the state of the Linear Profile check box.

This can be used to represent bursts for example.

Database Table Name: wn_ctl_node_xd_flow

Show Columns	Help Text
	Size, Type and Units
	Database Names
	Error Limits

Position in Data Structure	Field Name	Help Text	Flag	Units	Database Table	Database Field	Type	Default
1	Date Time	The date and time at which the exceptional flow value takes effect	NO		wn_ctl_node_xd_flow	exf_date_time
2	Flow	The additional demand being applied at this node at this time	NO	WN_Q	wn_ctl_node_xd_flow	exf_flow		0.0
3	Hydrant Status	This field is obsolete	NO		wn_ctl_node_xd_flow	exf_hydrant	Boolean

YES

xd_flow

Array

Linear Profile

This checkbox decides if values in the profile grid are interpolated.

checked - linear interpolation is carried out between values
unchecked - The value entered in the grid changes at each time point, and is maintained until the next time point is reached.

YES

linear_profile

Boolean

Before First Point (exceptional flow)

Database Value

Description

Help Text

Extend Back

The first value in the profile grid is extended back to the start of the simulation (and repeat period for repeated profiles).

Extrapolate Back

Applies to Linear Profiles only: the first two values in the profile grid are used to extrapolate back to the start of the simulation (and repeat period for repeated profiles).

(If Extrapolate Back is selected for a non linear profile, the profile will be extended back.)

Zero/Unchanged

A value of zero or "off" is applied from the start of the simulation until the date / time of the first value in the profile grid (and from the start of the repeat period for repeated profiles).

YES

before_xd_profile

Integer

After Last Point (exceptional flow)

Database Value

Description

Help Text

Extend Forward

The last value in the profile grid is extended to the end of the simulation or repeat period.

Extrapolate Forward

Applies to Linear Profiles only: the last two values in the profile grid are used to extrapolate forward to the end of the simulation or repeat period.

(If Extrapolate Forward is selected for a non linear profile, the profile will be extended forward.)

YES

after_xd_profile

Integer

Repeat Profile (exceptional flow)

Check the Repeat Profile box to repeat a profile (from 00:00 for the selected Repeat Period) for the duration of the simulation.

IMPORTANT

When using the Repeat Profile option; if the defined profile spans over the selected Repeat Period, the profile will not be repeated.

YES

repeat_xd_profile

Boolean

Repeat Period (exceptional flow)

Profile period which will be repeated throughout simulation, if the Repeat Profile box is checked.

Database Value	Description	Help Text
0	1 day	Repeat Period
1	1 week	Repeat Period
2	2 weeks	Repeat Period

YES

repeat_xd_period

Integer

Exceptional Flow

A read only check box displayed only on the grid view. This box is checked if data has been entered in the Exceptional Flow Grid on the property sheet

YES

exf_selected

Boolean

XD End Date & Time

This field is obsolete and is not displayed in the interface. This data is now entered in the Exceptional Flow Grid.

The field is maintained for backwards compatibility with old CSV data files. If this value is set when the data is imported, InfoWorks will calculate appropriate values for the Exceptional Flow Grid.

YES

xd_end_date_time

XD Flow Rate

This field is obsolete and is not displayed in the interface. This data is now entered in the Exceptional Flow Grid.

The field is maintained for backwards compatibility with old CSV data files. If this value is set when the data is imported, InfoWorks will calculate appropriate values for the Exceptional Flow Grid.

YES

WN_Q

exceptional_flow

XD Start Date & Time

This field is obsolete and is not displayed in the interface. This data is now entered in the Exceptional Flow Grid.

The field is maintained for backwards compatibility with old CSV data files. If this value is set when the data is imported, InfoWorks will calculate appropriate values for the Exceptional Flow Grid.

YES

xd_start_date_time

Hydrant Profile

Database Table Name: wn_ctl_opening_profile

A series of time / opening pairs that define the hydrant operation profile at the node. These values can be interpolated, depending on the state of the Linear Profile flag.

Show Columns	Help Text
	Size, Type and Units
	Database Names
	Error Limits

Position in Data Structure	Field Name	Help Text	Flag	Size	Units	Database Table	Database Field	Type	Default	Error Lower Limit	Error Upper Limit	Warning Lower Limit	Warning Upper Limit
1	Date Time	Date and time value	YES			wn_ctl_opening_profile	date_time
2	Opening	Percentage opening of hydrant valve	YES		WN_OPEN	wn_ctl_opening_profile	value		100	0	100

YES

hydrant_profile

Array

Hydrant Linear Profile

This checkbox decided if values in the profile grid are interpolated.

checked - linear interpolation is carried out between values
unchecked - The value entered in the grid changes at each time point, and is maintained until the next time point is reached.

YES

hyd_lin_profile

Boolean

Before First Point (hydrant flow)

Database Value

Description

Help Text

Extend Back

The first value in the profile grid is extended back to the start of the simulation (and repeat period for repeated profiles).

Extrapolate Back

Applies to Linear Profiles only: the first two values in the profile grid are used to extrapolate back to the start of the simulation (and repeat period for repeated profiles).

(If Extrapolate Back is selected for a non linear profile, the profile will be extended back.)

Zero/Unchanged

A value of zero or "off" is applied from the start of the simulation until the date / time of the first value in the profile grid (and from the start of the repeat period for repeated profiles).

YES

before_hydrant_profile

Integer

After Last Point (hydrant flow)

Database Value

Description

Help Text

Extend Forward

The last value in the profile grid is extended to the end of the simulation or repeat period.

Extrapolate Forward

Applies to Linear Profiles only: the last two values in the profile grid are used to extrapolate forward to the end of the simulation or repeat period.

(If Extrapolate Forward is selected for a non linear profile, the profile will be extended forward.)

YES

after_hydrant_profile

Integer

Repeat Profile (hydrant flow)

Check the Repeat Profile box to repeat a profile (from 00:00 for the selected Repeat Period) for the duration of the simulation.

IMPORTANT

When using the Repeat Profile option; if the defined profile spans over the selected Repeat Period, the profile will not be repeated.

YES

repeat_hydrant_profile

Boolean

Repeat Period (hydrant flow)

Profile period which will be repeated throughout simulation, if the Repeat Profile box is checked.

Database Value	Description	Help Text
0	1 day	Repeat Period
1	1 week	Repeat Period
2	2 weeks	Repeat Period

YES

repeat_hydrant_period

Integer

Hydrant Operation

This field is obsolete and is not displayed in the interface. It was previously used when hydrant flow data was entered in the Exceptional Flow Grid. The box was checked to switch between exceptional flow and hydrant flow modelling. There are now separate grids for exceptional flow and hydrant flow.

The field is maintained for backwards compatibility with old CSV data files.

YES

hydrant_flow

Boolean

Opening

This field is obsolete and is not displayed in the interface. This data is now entered in the Hydrant Flow Grid.

The field is maintained for backwards compatibility with old CSV data files. If this value is set when the data is imported, InfoWorks will calculate appropriate values for the Hydrant Flow Grid.

YES

WN_OPEN

available_flow

Integer

100

Cost Management

Check the Cost Management box to include the node Minimum Pressure and Maximum Pressure constraints for use in a Cost Management Simulation.

YES

optimise

Boolean

Minimum Pressure

A Cost Management Simulation constraint.

The target minimum pressure to be maintained at the node.

YES

WN_P

minimum_pressure

Maximum Pressure

A Cost Management Simulation constraint.

The target maximum allowable pressure at the node.

YES

WN_P

maximum_pressure

Enable Surge

Check this option to allow a surge protection device to be modelled.

YES

iwts_enable_surge_SPD

Boolean

Surge Protection

Dropdown list of Surge Protection Devices. Enabled when the Enable Surge option is checked.

Database Value	Description	Help Text
BLAD_SRG_T	Bladder Surge Tank	Closed surge tank containing a gas filled bladder. The bladder is pre-charged to a pre-determined pressure to maintain desired air volume under normal operating conditions.
CLOS_SRG_T	Closed Surge Tank	Surge vessel containing a specified initial gas volume. The gas expands and compresses as flow exits and enters the tank.
ESRG_ANT_V	Electronic Surge Anticipation Valve	Control is via a solenoid. In reality valve opens when solenoid is de-energised (either by power failure or through pressure switch on low pressure). In this version of InfoWorks WS a simplified version of the electronic surge anticipation valve may be modelled where valve opening occurs when: Initial Delay Time from run start time is reached. The valve follows an opening and closing cycle determined from Opening Time, Fully Open Time and Closing Time values. Pressure exceeds High Opening Pressure at Sensing Node ID location. The valve follows an opening and closing cycle determined from High Opening Time and High Closing Time values. If the valve exits to a pressurised region, an External pressure should be specified.
HSRG_ANT_V	Hydraulic Surge Anticipation Valve	Valve is activated as a normal pressure relief valve when pressure exceeds a preset maximum or on a downsurge of pressure in anticipation of an upsurge to follow. Valve opening will occur when: High Opening Pressure at a specified location (Sensing Node ID) is exceeded. The valve follows an opening and closing cycle determined from High Opening Time and High Closing Time values. Pressure drops below Low Opening Pressure at Sensing Node ID location. The valve follows an opening and closing cycle determined from Low Opening Time and Low Closing Time values. If the valve exits to a pressurised region, an External pressure should be specified.
ONEW_SRG_T	One Way Surge Tank	An open surge tank that allows flow from the tank into the pipe at periods of low pressure. A non-return valve prevents flow from entering the tank from the system.
OPEN_SRG_T	Open Surge Tank	Tank which is open to atmosphere. A Max tank depth is specified, above which spilling occurs.
PRESS_RV	Pressure Relief Valve	Valve opening is activated when Opening pressure at a specified location (Sensing Node ID) is exceeded. Valve closure is initiated when pressure at the sensing node reaches the Closing pressure. If the valve exits to a pressurised region, an External pressure should be specified.
RUPT_DISK	Rupture Disk	Device containing a non-reusable membrane designed to fail at a given pressure. Modelled by specifying an Opening Pressure
SIDE_DIS_O	Side Discharge Orifice	Represents an orifice in the pipeline where flow enters or exits based on standard orifice behaviour
SRG_ANT_V	Surge Anticipation Valve	Valve opening is activated on a downsurge of pressure in anticipation of an upsurge to follow. Valve opening will occur when Opening pressure at a specified location (Sensing Node ID) is met. The valve follows an opening and closing cycle determined from Opening Time, Fully Open Time and Closing Time values. If the valve exits to a pressurised region, an External pressure should be specified.
STGAVV_12	1 and 2 Stage Air Vacuum Valve	Single stage and 2 stage air/vacuum valves allow air into the system when pressure in the pipeline drops below atmospheric and release air when pressure in the pipeline is greater than atmospheric. An Initial Gas Volume may be specified. A single stage valve has a single orifice for inflow and outflow. To model a single stage valve, specify the same value for Inflow Diameter and Outflow Diameter. A 2 stage valve has a different size orifice for inflow and outflow. A smaller outflow orifice is used to reduce the rate of release of pressurised air in order to reduce 'air slam'. To model a two stage valve, specify the diameter of the orifice that allows air to enter the system as the Inflow Diameter, and the diameter of the orifice that allows air to exit the system as the Outflow Diameter.
STGAVV_3	3 Stage Air Vacuum Valve	A 3 stage air/vacuum valve has one inflow orifice that allows air to enter the system when pressure in the pipeline drops below atmospheric and two outflow orifices to release air when pressure in the pipeline is greater than atmospheric. An Initial Gas Volume may be specified. The first outflow orifice is a larger diameter allowing most of the air to be expelled quickly. The second smaller outflow orifice is used to reduce the rate of release of pressurised air in order to reduce 'air slam'. To model a three stage valve, specify the orifice diameters in the Inflow Diameter, Outflow Diameter and Outflow Diameter 2 fields. The switch from primary to secondary orifice can be controlled by flow, pressure or volume. Select the control parameter from the Switching Type dropdown and enter the switching value in the appropriate Switching field.

YES

iwts_spd_type

Text

SIDE_DIS_O

Inflow Diameter

Surge Protection Device field.

Inlet diameter of device.

YES

iwts_inflow_diameter

Single

0.0

Inflow Loss Coefficient

Surge Protection Device field.

Local headloss coefficient at inlet of device. (Does not apply to Air Vacuum Valves.)

YES

iwts_inflow_loss_coeff

Single

0.0

Outflow Diameter

Surge Protection Device field.

Outlet diameter of device. (Does not apply to Air Vacuum Valves.)

YES

iwts_outflow_diameter

Single

0.0

Outflow Loss Coefficient

Surge Protection Device field.

Local headloss coefficient at outlet of device. (Does not apply to Air Vacuum Valves.)

YES

iwts_outflow_loss_coeff

Single

0.0

Outflow Diameter 2

Surge Protection Device field, enabled when Surge Protection is set to STGAVV_3(3 Stage Air Vacuum Valve).

Diameter of secondary orifice used for air outflow if switching value is exceeded.

YES

iwts_outflow_diameter2

Single

0.0

Initial Gas Volume

Surge Protection Device field, enabled when Surge Protection is set to STGAVV_12 (1 and 2 Stage Air Vacuum Valve) STGAVV_3 (3 Stage Air Vacuum Valve) or CLOS_SRG_T (Closed Surge Tank).

Volume of gas present in valve or tank at start of simulation.

YES

WN_RVO

iwts_init_gas_volume

Single

0.0

Switching Type

Surge Protection Device field, enabled when Surge Protection is set to STGAVV_3(3 Stage Air Vacuum Valve).

Select the parameter to be used to control activation of the secondary outflow orifice.

Database Value	Description
PRESSURE	Pressure
FLOW	Flow
VOLUME	Volume

YES

iwts_switching_type

Text

PRESSURE

Switching Pressure

Surge Protection Device field, enabled when Surge Protection is set to STGAVV_3 (3 Stage Air Vacuum Valve) and Switching Type is set to PRESSURE.

Pressure at which secondary outflow orifice will be activated.

YES

WN_P

iwts_switching_pressure

Single

0.0

Switching Volume

Surge Protection Device field, enabled when Surge Protection is set to STGAVV_3 (3 Stage Air Vacuum Valve) and Switching Type is set to VOLUME.

Volume at which secondary outflow orifice will be activated.

YES

WN_RVO

iwts_switching_volume

Single

0.0

Switching Flow

Surge Protection Device field, enabled when Surge Protection is set to STGAVV_3 (3 Stage Air Vacuum Valve) and Switching Type is set to FLOW.

Flow at which secondary outflow orifice will be activated.

YES

WN_Q

iwts_switching_flow

Single

0.0

External Pressure

Surge Protection Device field, enabled when Surge Protection is set to ESRG_ANT_V (External Surge Anticipation Valve), HSRG_ANT_V (Hydraulic Surge Anticipation Device), PRESS_RV (Pressure Relief Valve), SIDE_DIS_O (Side Discharge Orifice) or SRG_ANT_V (Surge Anticipation Valve).

External pressure at valve exit or discharge point.

YES

WN_P

iwts_external_pressure

Single

0.0

Opening Pressure/Low Opening Pressure

Surge Protection Device field, enabled when Surge Protection is set to HSRG_ANT_V (Hydraulic Surge Anticipation Device), PRESS_RV (Pressure Relief Valve), SRG_ANT_V (Surge Anticipation Valve) or RUPT_DISK (Rupture Disk).

Pressure at the sensing node which will initiate opening of the valve or failure of the disk membrane.

(For Hydraulic Surge Anticipation Valves, opening of the valve is triggered when pressure at sensing node falls below low opening pressure.)

YES

WN_P

iwts_opening_pressure

Single

Opening Time/Low Opening Time

Surge Protection Device field, enabled when Surge Protection is set to ESRG_ANT_V (Electronic Surge Anticipation Valve), HSRG_ANT_V (Hydraulic Surge Anticipation Device), PRESS_RV (Pressure Relief Valve) or SRG_ANT_V (Surge Anticipation Valve).

Time valve takes to reach fully open position.

For Hydraulic Surge Anticipation Valves, used when opening of the valve is triggered by pressure dropping below low opening pressure.

For Electronic Surge Anticipation Valve, used when opening of the valve is triggered by Initial Delay Time after run start time being reached

YES

iwts_opening_time

Single

Closing Time/Low Closing Time

Time valve takes to reach fully closed position from fully open.(when opening of valve triggered by pressure dropping below low opening pressure for Hydraulic Surge Anticipation Valves).

YES

iwts_closing_time

Single

Fully Open Time

Surge Protection Device field, enabled when Surge Protection is set to ESRG_ANT_V (Electronic Surge Anticipation Valve) or SRG_ANT_V (Surge Anticipation Valve).

Amount of time that valve will remain fully open once activated.

YES

iwts_fully_open_time

Single

Initial Delay Time

Surge Protection Device field, enabled when Surge Protection is set to ESRG_ANT_V (Electronic Surge Anticipation Valve).

The length of time after the run start time when opening of the valve will be activated. The opening and closing cycle of the valve is determined from the Electric Solenoid settings: Opening Time, Fully Open Time and Closing Time.

YES

iwts_initial_delay_time

Single

High Opening Time

Surge Protection Device field, enabled when Surge Protection is set to ESRG_ANT_V (Electronic Surge Anticipation Valve) or HSRG_ANT_V (Hydraulic Surge Anticipation Valve).

Time valve takes to reach fully open position when opening of valve triggered by high opening pressure being exceeded.

YES

iwts_high_opening_time

Single

High Opening Pressure

Surge Protection Device field, enabled when Surge Protection is set to ESRG_ANT_V (Electronic Surge Anticipation Valve) or HSRG_ANT_V (Hydraulic Surge Anticipation Valve).

If pressure at the sensing node is exceeded opening of the valve will be initiated.

YES

WN_P

iwts_high_opening_pressure

Single

High Closing Time

Surge Protection Device field, enabled when Surge Protection is set to ESRG_ANT_V (Electronic Surge Anticipation Valve) or HSRG_ANT_V (Hydraulic Surge Anticipation Valve).

Time valve takes to reach fully closed position from fully open when opening of valve triggered by high opening pressure being exceeded.

YES

iwts_high_closing_time

Single

Linear Valve Operation

Surge Protection Device field, enabled when Surge Protection is set to ESRG_ANT_V (Electronic Surge Anticipation Valve) or HSRG_ANT_V (Hydraulic Surge Anticipation Valve).

Check this option to model opening and closing of valve using a linear profile.

YES

iwts_linear_valve_operation

Boolean

Hybrid Tank

Surge Protection Device field, enabled when Surge Protection is set to CLOS_SRG_T (Closed Surge Tank).

Check this option to model the tank as a hybrid tank. When pressure in the tank falls below atmospheric pressure, the tank will operate as an open surge tank until pressure rises above atmospheric, when the surge tank operates again as a closed surge tank.

YES

iwts_hybrid_tank

Boolean

Sensing Node ID

Surge Protection Device field, enabled when Surge Protection is set to ESRG_ANT_V (Electonic Surge Anticipation Valve), HSRG_ANT_V (Hydraulic Surge Anticipation Device), PRESS_RV (Pressure Relief Valve) or SRG_ANT_V (Surge Anticipation Valve).

Node representing location at which pressure controlling activation of valve is monitored.

If a node is not specified, the sensing location is assumed to be at the valve itself.

YES

iwts_sensing_node_id

Single

Tank Diameter

Surge Protection Device field, enabled when Surge Protection is set to BLAD_SRG_T (Bladder Surge Tank), CLOS_SRG_T (Closed Surge Tank), ONEW_SRG_T (One Way Surge Tank) or OPEN_SRG_T (Open Surge Tank).

Diameter of a cylindrical tank, or equivalent diameter for a non-cylindrical tank

YES

iwts_tank_diameter

Single

Max Tank Depth

Surge Protection Device field, enabled when Surge Protection is set to ONEW_SRG_T (One Way Surge Tank) or OPEN_SRG_T (Open Surge Tank).

Maximum level of water in tank before overspill occurs

YES

iwts_max_tank_depth

Single

Closing Pressure

Surge Protection Device field, enabled when Surge Protection is set to PRESS_RV (Pressure Relief Valve).

Pressure at the sensing node which will initiate closure of the pressure relief valve if open.

YES

WN_P

iwts_closing_pressure

Single

NRV Diameter

Surge Protection Device field, enabled when Surge Protection is set to ONEW_SRG_T (One Way Surge Tank).

Diameter of non return valve on tank connecting pipe.

YES

iwts_nrv_diameter

Single

Tank Volume

Surge Protection Device field, enabled when Surge Protection is set to CLOS_SRG_T (Closed Surge Tank) or BLAD_SRG_T (Bladder Surge Tank).

Volume of closed surge tank or volume of tank bladder.

YES

WN_RVO

iwts_tank_volume

Single

Variable Area Data

Surge Protection Device field, enabled when Surge Protection is set to BLAD_SRG_T (Bladder Surge Tank), CLS_SRG_T (Closed Surge Tank), ONEW_SURGE_T (One Way Surge Tank) or OPEN_SRG_T (Open Surge Tank).

The depth/area grid provides a description of storage capacity by defining storage area at a series of depths.

Database Table Name: wn_ctl_node_iwts_tank_depth_area

Show Columns	Help Text
	Size, Type and Units
	Database Names
	Error Limits

Position in Data Structure	Field Name	Help Text	Flag	Size	Units	Database Table	Database Field	Type	Default	Error Lower Limit	Error Upper Limit	Warning Lower Limit	Warning Upper Limit
1	Depth	Depth in tank	NO		Y	wn_ctl_node_iwts_tank_depth_area	pdDepth	Double	0.0
2	Area	Area of tank at corresponding depth	NO		NA	wn_ctl_node_iwts_tank_depth_area	pdArea	Double	0.0

iwts_SPDT_area_depth

Array

NRV Loss Coefficient

Surge Protection Device field, enabled when Surge Protection is set to ONEW_SRG_T (One Way Surge Tank).

Loss coefficient of non return valve on tank connecting pipe.

YES

iwts_nrv_loss_coeff

Single

Expansion Constant

Surge Protection Device field, enabled when Surge Protection is set to CLOS_SRG_T (Closed Surge Tank) or BLAD_SRG_T (Bladder Surge Tank).

The expansion constant for the gas within the surge vessel (obtained from tank manufacturer).

A value between 1 and 1.4 should be used, where 1 is used for isothermal compression and 1.4 for adiabatic compression.

YES

iwts_exp_const

Single

NRV Response Time

Surge Protection Device field, enabled when Surge Protection is set to ONEW_SRG_T (One Way Surge Tank).

Amount of time that it takes for the non return valve on tank connecting pipe to go from fully opened to fully closed

YES

iwts_nrv_response_time

Single

Preset Pressure

Surge Protection Device field, enabled when Surge Protection is set to BLAD_SRG_T (Bladder Surge Tank).

Value that the pressure in the connecting pipe must exceed in order for the device to operate.

YES

WN_P

iwts_preset_pressure

Single

Initial Tank Depth

Surge Protection Device field, enabled when Surge Protection is set to CLOS_SRG_T (Closed Surge Tank), BLAD_SRG_T (Bladder Surge Tank) or ONEW_SRG_T (One Way Surge tank).

Level of water in tank at start of simulation.

YES

iwts_init_tank_depth

Single

Valve Response Time

Surge Protection Device field, enabled when Surge Protection is set to STGAVV_12 (1 and 2 Stage Air Vacuum Valve) or STGAVV_3 (3 Stage Air Vacuum Valve).

Used to set the rate at which the valve opens/closes. The modulation of the valve is carried out by changing its resistance (headloss/flow2) by small increments equal to (surge timestep)/(valve response time).

YES

iwts_valve_resp_time

Double

Enable Surge

Check this option to allow surge demand to be modelled.

YES

iwts_enable_surge_DEM

Boolean

Node Demand Event

A series of time / demand pairs that define a time varying profile of demand at the node for use when carrying out a Transient System run.

The grid is enabled when the Enable Surge option is checked.

Database Table Name: wn_ctl_node_iwts_event

Show Columns	Help Text
	Size, Type and Units
	Database Names
	Error Limits

Position in Data Structure	Field Name	Help Text	Flag	Size	Units	Database Table	Database Field	Type	Default	Error Lower Limit	Error Upper Limit	Warning Lower Limit	Warning Upper Limit
1	Time	The time at which the demand takes effect	NO			wn_ctl_node_iwts_event	time	Double	0.0
2	Demand	The demand being applied at this node at this time	NO		WN_DQ	wn_ctl_node_iwts_event	demand	Double	0.0

YES

iwts_event

Array

Node ID

Name of the node

YES

node_id

Text

Asset ID

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

YES

asset_id

Text

Notes

You can keep freeform notes about any object in your network. The notes field can be up to 64,000 characters in size, or about 10 pages of printed text.

YES

notes

Memo

Node Results

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 nodes, see the Node Results Data Fields topic.

Basic Node

Network Data Fields

Common Data Fields

Customer Point Data Fields

Node Results Data Fields