Node results data fields

All results fields are displayed on the results 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.

Time varying results are shown with the field name in an alternate colour on the grid and property sheets. Non time varying results have the field name in the normal black type.

The table below displays node results applicable regardless of the type of simulation being run. For more information on the additional results available for special types of simulations, follow the links below:

Node Results Data fields

Database Table: __IWR_Node

Field Name Help Text Units Database Field

Demand
Node Description

Basic Nodes

Total demand on node. Calculated as sum of:

If there is exceptional flow and/or flow due to hydrant operation, and the Keep Local Demand check box on the Node Control page is not checked, demands specified on the Node Demand Page will not be applied.

When carrying out a Transient System Simulation, if Transient Demand is applied, no other demands will be applied.

Reservoir Node

Total demand on node. Calculated as sum of:

Transfer Nodes

Total demand on node. Calculated as the sum of:

Hydrant Node

 

Total demand on node. Calculated as the sum of:

(If the hydrant is in operation, and the Keep Local Demand check box on the Node Control page is not checked, the demands defined on the Node Demand Page are not applied)

WN_DQ

DEMAND

Head

Head at node at timestep t

HEAD

HEAD

Max Head

Maximum head at node at timestep t

HEAD

MAXHEAD

Min Head

Minimum head at node at timestep t

HEAD

MINHEAD

Leakage

Total leakage on node at current timestep. Calculated as sum of pressure related leakage and constant leakage loss defined on Node Demand Page

(Not displayed for Transient Simulations)

WN_DQ

LEAKAGE

Avg Pressure

Time weighted average of node pressure results

WN_P

PNAVG

Max Pressure

Maximum Pressure experienced at node during simulation

WN_P

PNMAX

Min Pressure

Minimum Pressure experienced at node during simulation

WN_P

PNMIN

Pressure

Pressure at node at timestep t

WN_P

PRESSURE

Status

The value for Status at each timestep can be one of the following:

Database Value Description Help Text

-1

temp isolated

The node is isolated in the current timestep

0

-

 

1

isolated

The node is isolated from the network for the duration of the simulation

 

STATUS

Type

The value for Type identifies the type of node and can be one of the following:

1

Node

2

Reservoir

3

Fixed Head

4

Transfer Node

5

Hydrant

6

Well

 

TYPE

Total Consumption

Total consumption at node during simulation period.

Calculated as:

Total Demand - (Exceptional Flow + Hydrant Flow)

Total consumption at transfer nodes will be zero.

(Not displayed for Transient Simulations)

WN_DVO

TOTCONS

Total Demand

Total Demand applied at node during simulation period.

(Not displayed for Transient Simulations)

WN_DVO

TOTDEMND

Total Leakage

Total leakage applied at node during simulation period. Calculated as sum of pressure related leakage and constant leakage loss defined on Node Demand Page.

(Not displayed for Transient Simulations)

WN_DVO

TOTLEAK

Load (In - Out)

Net rate of inflow into reservoir (Inflow minus Outflow)

Reservoir only

WN_Q

_Load

Deficit

The reservoir may become empty because the outflows exceed the inflows. InfoWorks allows computation to continue with the assumption that reservoir head remains at the reservoir bottom level.

The deficit is the amount of water needed to maintain head at that level.

Reservoir only

WN_VO

DEFICIT

Depth

Vertical distance from reservoir bottom level to water level

Reservoir only

Y

DEPTH

Inflow

Rate of flow into the Reservoir

Reservoir only

WN_Q

INFLOW

Spill

The total amount of water lost to the system due to reservoir overflow

Reservoir only

WN_VO

SPILL

Top Level

Top Water Level as specified on the Reservoir Parameters Page of the Reservoir Property Sheet.

Reservoir only

Z

TOPLEVEL

Full Volume

Full volume of Reservoir (specified in Depth/Volume grid on Reservoir Parameters Page of the Reservoir Property Sheet).

Reservoir only.

WN_VO

VOLFULL

Volume

Volume of water in the reservoir

Reservoir only

WN_VO

VOLUME

Maximum Depth

Maximum depth of water in Reservoir during a simulation.

Reservoir only.

Y

MAXDEPTH

Outflow

Rate of flow out of the Reservoir

Reservoir only

WN_Q

OUTFLOW

Percentage Full

Volume of water in the reservoir expressed as a percentage of available capacity. (Volume of water above the reservoir Minimum Operating Level specified in the Reservoir Parameters Page of the Reservoir Property Sheet).

Reservoir only

 

PCFULL

Hydrant Flow

Flow due to percentage opening of hydrant valve

Hydrant only

WN_Q

FLOW

Opening

Percentage opening of hydrant valve

Hydrant only

WN_OPEN

OPENING

Total Nominal Demand

Applicable to Pressure Related Demand simulations only.

Total Demand that would be applied at node during simulation period if the simulation were not a Pressure Related Demand simulation. i.e. Demand at node before the application of pressure related demand curves.

WN_DVO

TOTNDEMD

Nominal Demand

Applicable to Pressure Related Demand simulations only.

Demand at node calculated before the application of Pressure Related Demand curves.

WN_DQ

NOMDEMND

Event Demand Efficiency (%)

Applicable to Pressure Related Demand simulations only.

Ratio of Total Demand to Total Nominal Demand as a percentage.

 

DEMNDEFF
Energy Loss

Applicable when carrying out Sustainability Analysis only.

Daily rate of energy loss at customer connections.

WN_EN_DY

SUSELOSS

Total Energy Loss

Applicable when carrying out Sustainability Analysis only.

Total daily energy loss at customer connections.

WN_EN_DY

SUSTELSS

CO2 Equivalent Loss

Applicable when carrying out Sustainability Analysis only.

Daily rate of energy loss at customer connections expressed as a carbon dioxide equivalent.

WN_GHG_DYMASS

SUSCELSS

Total CO2 Equivalent Loss

Applicable when carrying out Sustainability Analysis only.

Total daily energy loss at customer connections expressed as a carbon dioxide equivalent.

WN_GHG_DYMASS

SUSTCELS

Water Quality Results

The table below lists the additional results available at nodes when a Water Quality Simulation is run:

Field Name Help Text Units Database Table Database Field Time Varying

Concentration

The concentration at this node of the pollutant being modelled in the Water Quality simulation.

WN_C

__IWR_Node

CONC

False

Concentration

The concentration contributed by any source at the node.

WN_C

__IWR_Node

CONC

False

Trace (%) <source node ID>

Percentage of water at a node that has originated from a trace node.

 

__IWR_Node

TRACE

False

Max Trace (%) <source node ID>

Maximum Trace (%) value experienced during the simulation.

   __IWR_Node  

False

Source Concentration

Concentration contributed by any source defined at the node.

WN_C

__IWR_Node

SRCCON

False

Average Age of Water (hr)

Time weighted average of Age of Water results calculated at each water quality timestep.

 

__IWR_Node

WQAVGAGE

False

Dominant Source

Indication of which source contributes the most to water reaching the node, where the sources are Trace Nodes (selected in the Water Quality Options dialog).

Database Value Description Help Text

-2

MIXED

Sources sum to 100% but no trace exceeds 50%

-1

DOUBLED

Sum of sources exceeds 100%

0

UNKNOWN

Sum of sources less than 100%

1

TRACE01

Sum of sources equals 100% (within a 5% tolerance) and the reported source node provides> 50% of water reaching the node.

2

TRACE02

Sum of sources equals 100% (within a 5% tolerance) and the reported source node provides> 50% of water reaching the node.

3

TRACE03

Sum of sources equals 100% (within a 5% tolerance) and the reported source node provides> 50% of water reaching the node.

4

TRACE04

Sum of sources equals 100% (within a 5% tolerance) and the reported source node provides> 50% of water reaching the node.

5

TRACE05

Sum of sources equals 100% (within a 5% tolerance) and the reported source node provides> 50% of water reaching the node.

6

TRACE06

Sum of sources equals 100% (within a 5% tolerance) and the reported source node provides> 50% of water reaching the node.

7

TRACE07

Sum of sources equals 100% (within a 5% tolerance) and the reported source node provides> 50% of water reaching the node.

8

TRACE08

Sum of sources equals 100% (within a 5% tolerance) and the reported source node provides> 50% of water reaching the node.

9

TRACE09

Sum of sources equals 100% (within a 5% tolerance) and the reported source node provides> 50% of water reaching the node.

10

TRACE10

Sum of sources equals 100% (within a 5% tolerance) and the reported source node provides> 50% of water reaching the node.

 

__IWR_Node

TRACE_DOMINANT

False

Trace (%)

 

 

__IWR_Node

TRACE

False

Age of Water (hr)

This factor gives an estimate of the age of water at various points in the system. This can be used as a rule of thumb measure of underlying water quality.

Any new water entering the system at reservoirs or source nodes has age zero, unless an Initial Age of Water has been specified. InfoWorks calculates the average length of time the water at this node has spent in the system before arriving here. See Water Quality Solver Theory for more details on how this is calculated.

 

__IWR_Node

TRAVEL

False
Turbidity

Turbidity at the node

(Only displayed when Turbidity Analysis carried out)

 WN_TURBIDITY __IWR_Node TURBIDITY True
Maximum Turbidity

Maximum Turbidity experienced during the simulation

(Only displayed when Turbidity Analysis carried out)

 WN_TURBIDITY __IWR_Node TURBMAX False

Fire Flow Simulation Results

The tables below list the additional results available at nodes when a Fire Flow Simulation is run:

Hydrant Testing Simulation

Field Name Help Text Units Database Table Database Field Time Varying

Residual Pressure at Minimum Fire Flow

Pressure at the test node when the Minimum Fire Flow is applied at the node.

This result is calculated only if the Calculate Pressure at Min and Max Fire Flow option is checked on the Fire Flow Options dialog.

WN_P

__IWR_Node

FFMINQRP

False

Network Minimum Residual Pressure Required

The minimum residual pressure during the fire incident at nodes that are not in the same Fire Zone as the test node.

Note: Fixed Head, Well and Reservoir nodes are not included in the check for Network Minimum Residual Pressure.

This result is calculated only if the Use Network Constraints option is checked on the Fire Flow Options dialog.

WN_P

__IWR_Node

FFNMRPRQ

False

Maximum Fire Flow

 The smaller of the user defined Maximum Fire Flow Required and calculated Fully-open Hydrant Flow at the test node.

This result is calculated only if the Calculate Pressure at Minimum and Maximum Fire Flow option is checked on the Fire Flow Options dialog.

WN_Q

__IWR_Node

FFMAXQ

False

Residual Pressure at Maximum Fire Flow

Pressure at the test node when the Maximum Fire Flow is applied at the node.

This result is calculated only if the Calculate Pressure at Min and Max Fire Flow option is checked on the Fire Flow Options dialog.

WN_P

__IWR_Node

FFMAXQRP

False

Maximum Fire Flow Required

A maximum flow value is specified by the user in the Fire Flow Data Item or on the Fire Flow Constraints Page of the Hydrant Node Property Sheet.

This information is displayed only if the Calculate Pressure at Min and Max Fire Flow option is checked on the Fire Flow Options dialog.

WN_Q

__IWR_Node

FFMAXQRQ

False

Minimum Fire Flow

The smaller of the user defined Minimum Fire Flow Required and calculated Available Fire Flow at the test node.

WN_Q

__IWR_Node

FFMINQ

False

Minimum Fire Flow Required

Minimum flow required to satisfy fire protection needs. The minimum flow value is specified by the user in the Fire Flow Data Item or on the Fire Flow Constraints Page of the Hydrant Node Property Sheet.

WN_Q

__IWR_Node

FFMINQRQ

False

Residual Pressure at Available Fire Flow

The residual pressure at the test node when the Available Fire Flow is applied at the node.

WN_P

__IWR_Node

FFMINRP

False

Minimum Residual Pressure Required

The minimum allowed residual pressure at the test node during the fire incident

WN_P

__IWR_Node

FFMINRPR

False

Network Minimum Residual Pressure

The minimum residual pressure during the fire incident at nodes that are not in the same Fire Zone as the test node.

This information is displayed only if the Use Network Constraints option is checked on the Fire Flow Options dialog.

WN_P

__IWR_Node

FFNETMRP

False

Minimum Zone Node

Node at which Zone Minimum Residual Pressure occurs.

 

__IWR_Node

FFHYDZND

False

Available Fire Flow

Maximum fire flow that can be taken at test node without breaching pressure constraints.

The Available Fire Flow is determined from:

  • Minimum Residual Pressure Required

  • Zone Minimum Residual Pressure Required (if Use Zone Constraints option checked)

  • Network Minimum Residual Pressure Required (If Use Network Constraints option checked)

If the pressure constraints applied cannot be met, the test node will be Failed

WN_Q

__IWR_Node

FFAVAILQ

False

Fully-open Hydrant Flow

Flow at test node when hydrant is 100% open.

This result is calculated only if the Calculate Open Hydrant Flow option is checked on the Fire Flow Options dialog.

WN_Q

__IWR_Node

FFOPENQ

False

Hydrant Fire Flow

The hydrant test flow applied to the target node.

Can also be displayed as a graph plotted against Hydrant Residual Pressure. Right click in the Grid Report (Hydrant Testing) View and select Hydrant Curve from the context menu to display the graph.

WN_Q

__IWR_Node

FFHYDQ

False

Hydrant Residual Pressure

The pressure at the target node after fire flow has been applied at the node.

Can also be displayed as a graph plotted against Hydrant Fire Flow. Right click in the Grid Report (Hydrant Testing) View and select Hydrant Curve from the context menu to display the graph.

Applicable to Hydrant Testing and Forced Fire Flow simulations.

WN_P

__IWR_Node

FFHYDRP

False

Minimum Network Node

Node at which the Network Minimum Residual Pressure occurs.

 

__IWR_Node

FFNETNOD

False

Pre-Test Demand

Demand at test node at Hydrant Testing Time before applying fire flow. This is the demand that would be applied when carrying out a simulation of Run Type normal.

WN_Q

__IWR_Node

FFSTATQ

False

Result

There are three test result types:

Test Result Description

Passed

The node will pass if the minimum fire flow required can be supplied without breaching any of the pressure constraints applied.

Failed

The node will fail if the minimum fire flow required cannot be supplied without breaching any of the pressure constraints applied.

Unknown

The test result will be unknown if the node is not tested, (if Hydrant Flow has been set up on the Flow Control Page of a test node for example), or if the simulation fails to converge.

 

__IWR_Node

FFRESULT

False

Zone Minimum Residual Pressure Required

The minimum allowed residual pressure during the fire incident at nodes that are in the same Fire Zone as the test node. The test node itself is not included.

This information is displayed only if the Use Zone Constraints option is checked on the Fire Flow Options dialog.

WN_P

__IWR_Node

FFZMRPRQ

False

Zone Minimum Residual Pressure

The minimum residual pressure during the fire incident at nodes that are in the same Fire Zone as the test node (the test node itself is not included).

This result is calculated only if the Use Zone Constraints option is checked on the Fire Flow Options dialog.

WN_P

__IWR_Node

FFZONMRP

False

Residual Pressure at Fully-open Hydrant

Pressure at the test node when the Fully-open Hydrant Flow is applied at the node.

This result is calculated only if the Calculate Open Hydrant Flow option is checked on the Fire Flow Options dialog.

WN_P

__IWR_Node

FFOPENRP

False

Pre-Test Pressure

Pressure at test node at Hydrant Testing Time before applying fire flow. This is the result that would be obtained when carrying out a simulation of Run Type normal.

WN_P

__IWR_Node

FFSTATP

False

Minimum Zone Node

Node at which Zone Minimum Residual Pressure occurs.

 

__IWR_Node

FFZONNOD

False

Forced Fire Flow Simulation

Field Name Help Text Units Database Table Database Field Time Varying

Maximum Velocity Link

Link ID of the link in which the Maximum Velocity occurred. If the Maximum Velocity occurs in the assumed hydrant pipe, this will be indicated by the text "Hydrant".

 

__IWR_Node

FFHYDVLK

False

Maximum Velocity

The maximum velocity experienced in the network at the snapshot for which the Forced Fire Flow simulation is run.

V

__IWR_Node

FFHYDVEL

False

Minimum Network Node

The Node ID of the node at which the Network Minimum Residual Pressure occurred.

 

__IWR_Node

FFHYDNND

False

Minimum Zone Node

Node at which Zone Minimum Residual Pressure occurs.

 

__IWR_Node

FFHYDZND

False

Available Fire Flow

Maximum fire flow that can be taken at test node without breaching pressure constraints.

The Available Fire Flow is determined from:

  • Minimum Residual Pressure Required

  • Zone Minimum Residual Pressure Required (if Use Zone Constraints option checked)

  • Network Minimum Residual Pressure Required (If Use Network Constraints option checked)

If the pressure constraints applied cannot be met, the test node will be Failed

WN_Q

__IWR_Node

FFAVAILQ

False

Network Minimum Residual Pressure

The minimum residual pressure in the network.

Note: Fixed Head, Well and Reservoir nodes are not included in the check for Network Minimum Residual Pressure.

WN_P

__IWR_Node

FFHYDNRP

False

Maximum Flow Reversal Link

Link ID of the link in which the Maximum Flow Reversal occurred.

 

__IWR_Node

FFHYDQRL

False

Maximum Flow Reversal

The maximum flow reversal in the network (compared with base simulation).

WN_Q

__IWR_Node

FFHYDQRV

False

Hydrant Relative Head

A negative value indicates that pumping will be required.

The numerical value of the drop is derived by assuming that a standard hydrant object is connected to the test node. Hydrant properties used in the calculation are:

  • Pipe diameter = min diameter of pipes attached to the test node.

  • Relative head = 0.0

  • Local loss coeff = 1.0.

  • Valve diameter = pipe diameter.

  • Valve curve = PLUG

  • Valve local loss = 1.0

HEAD

__IWR_Node

FFHYDRHD

False

Hydrant Residual Pressure

The pressure at the target node after fire flow has been applied at the node.

Can also be displayed as a graph plotted against Hydrant Fire Flow. Right click in the Grid Report (Hydrant Testing) View and select Hydrant Curve from the context menu to display the graph.

Applicable to Hydrant Testing and Forced Fire Flow simulations.

WN_P

__IWR_Node

FFHYDRP

False

Fire Flow Availability Simulation

Field Name Help Text Units Database Table Database Field Time Varying

FFA Flow

The fire flow at each node.

The simulation will attempt to enforce either the Required Fire Flow or the Residual Nodal Pressure depending on the option chosen when setting up the simulation

WN_Q

__IWR_Node

FFA_FLOW

False

Minimum Zone Node

Node at which Zone Minimum Residual Pressure occurs.

 

__IWR_Node

FFHYDZND

False

Available Fire Flow

Maximum fire flow that can be taken at test node without breaching pressure constraints.

The Available Fire Flow is determined from:

  • Minimum Residual Pressure Required

  • Zone Minimum Residual Pressure Required (if Use Zone Constraints option checked)

  • Network Minimum Residual Pressure Required (If Use Network Constraints option checked)

If the pressure constraints applied cannot be met, the test node will be Failed

WN_Q

__IWR_Node

FFAVAILQ

False

FFA Residual Pressure

The residual pressure at each node.

The simulation will attempt to enforce either the Required Fire Flow or the Residual Nodal Pressure depending on the option chosen when setting up the simulation

WN_P

__IWR_Node

FFA_RP

False

Transient System Simulation

The table below lists the additional results available at nodes when an InfoWorks TS (Transient System) Simulation is run:

Filed Name Help Text Units Database Table Database Field Time Varying
Avg Demand Time weighted average of Demand results WN_DQ __IWR_Node DEMAVG False
Min Demand Minimum Demand experienced during surge simulation WN_DQ __IWR_Node DEMMIN False
Node Pressure

Pressure at node at which surge protection device is located

 WN_P __IWR_Node INPRESS True
Avg Node Pressure Time weighted average of Node Pressure results WN_P __IWR_Node

INPRAVG

 False
Min Node Pressure Minimum Node Pressure experienced during surge simulation WN_P __IWR_Node INPRMIN False
SPD Pressure Pressure at surge protection device (see Node Pressure) WN_P __IWR_Node OUTPRESS True
Avg SPD Pressure Time weighted average of SPD Pressure results WN_P __IWR_Node OUTPRAVG False
Min SPD Pressure Minimum SPD Pressure experienced during surge simulation WN_P __IWR_Node OUTPRMIN False
Pipe Inflow

Inflow from network to SPD Device. For example:

 WN_Q __IWR_Node INLTFLOW True
Avg Pipe Inflow Time weighted average of Pipe Inflow results WN_Q __IWR_Node INFLWAVG False
Min Pipe Inflow Minimum Pipe Inflow experienced during surge simulation WN_Q __IWR_Node INFLWMIN False
Pipe Outflow Outflow from SPD device to network (see Pipe Inflow) WN_Q __IWR_Node OUTLTFLW True
Avg Pipe Outflow Time weighted average of Pipe Outflow results WN_Q __IWR_Node OUTFLAVG False
Min Pipe Outflow Minimum Pipe Outflow experienced during surge simulation WN_Q __IWR_Node OUTFLMIN False
External Depth Depth in surge protection device Y __IWR_Node EXTDEPTH True
External Flow

Flow from network to/from surge protection device

External Flow = Pipe Inflow - Pipe Outflow

(See Pipe Inflow)

 WN_Q __IWR_Node EXTFLOW True
Avg External Flow Time weighted average of External Flow results WN_Q __IWR_Node EXTFLAVG False
Min External Flow Minimum External Flow experienced during surge simulation WN_Q __IWR_Node EXTFLMIN False
External Volume

Volume of air contained by surge protection device, applicable to surge tanks, air valves etc.

For non-applicable devices, a value of 0.0 will be reported

 WN_VO __IWR_Node EXTVOLUM True
Avg External Volume Time weighted average of External Volume results WN_VO __IWR_Node EXTVOAVG False
Min External Volume Minimum External Volume experienced during surge simulation WN_VO __IWR_Node EXTVOMIN False
Intrusion

Only displayed when an Intrusion Calculation type has been selected from InfoWorks TS Options dialog.

The volume of groundwater entering system via leaky joints or pipe cracks due to extremely low or negative pressures in the network.

Gives an indicator of potential contamination threat.

 WN_DVO __IWR_Node INTRUSN False

Results data fields

About nodes

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