Units Key

This topic contains a list of all the display units available in InfoWorks ICM. There are three built-in sets of display units:

You can also set up your own preferred display format by setting the display units for individual data types. See Changing the Display Units for information on how to display data in your preferred format.

Unit Grid Key

The table below describes the structure of the Unit Types table, and explains what each of the columns contains.

Column

Description

Code

The unit code used internally by InfoWorks ICM. The Code column contains the data type codes seen in the Network Data Fields topics.

Field Name

A description of the unit

Unit

The units used for the InfoWorks ICM Native Units system

MGD/FT3

The units used for the built-in MGD or FT3 units system

Help Text

This column contains a more detailed description of the unit.

If additional units are available for the field, these are listed in the help text section. The columns in this grid contain the following details

Column

Description

Unit

The alternative unit type available for this unit code

Multiplier

This is the Conversion Multiplier applied to the value when converting from InfoWorks ICM Native Units to this unit type

Offset

This is the Conversion Offset added to the value when converting from InfoWorks ICM Native Units to this unit type

Precision Adjustment

This is the change in the number of decimal places allowed when the unit type changes. If the size of the unit increases, for example metres to kilometres, then this will be a positive number.

Available Unit Types

Please note that some unit types listed below may not apply to your specific software product.

Code

Field Name

Unit

MGD

FT3

Help Text
A Electric Current A A A

Applicable to Asset Networks

Unit of electric current

ANGLE

Angle

degree

degree

degree

Applicable to Model Networks

General unit of angle

Unit

Multiplier

Offset

Precision Adjustment

radian

0.017453292

0

1
ANGLER Angle (Results) radians radians radians

Applicable to Model Networks

Unit of angle for results

Unit

Multiplier

Offset

Precision Adjustment

degree

57.2958

0

1
ANGLEV Angular velocity degree/s degree/s degree/s

Applicable to Model Networks

Unit of angular velocity

Unit

Multiplier

Offset

Precision Adjustment

radian/s

0.017453292

0

1
BOS Bridge opening size m ft ft

Applicable to Model Networks

Used for all measurements of bridge opening size

Unit

Multiplier

Offset

Precision Adjustment

ft

3.280839895

0

0

CA

Catchment area

ha

acre

acre

Applicable to Model Networks

Unit of area applied specifically to catchments

Unit

Multiplier

Offset

Precision Adjustment

acre

2.47105

0

0

CAMS_PS

Pipe size

mm

in

in

Applicable to Asset Networks

Used for all measurements of pipe size

Unit

Multiplier

Offset

Precision Adjustment

in

0.039370078

0

1
m 0.001 0 3
CC Coliforms concentration cfu/100ml MPN/100ml MPN/100ml

Applicable to Model Networks

Concentration of coliforms
CED Coliforms Exponential Decay 1/(cfu/100ml) 1/(MPN/100ml) 1/(MPN/100ml)

Applicable to Model Networks

Exponential decay for coliforms

CF

Temperature

degree C

degree F

degree F

Applicable to Model Networks

General unit of temperature

Unit

Multiplier

Offset

Precision Adjustment

degree F

1.8

32

0

K

1

273.15

0
CFS Coliform flow

cfu*10^9/kg

MPN*10^9/kg

MPN*10^9/kg

Applicable to Model Networks

Coliform flow (results data)

CI

Conduit inflow

m3/s/m

MGD/ft

ft3/s/ft

Applicable to Model Networks

From user defined defaults and calculated base flow based on pipe length

Unit

Multiplier

Offset

Precision Adjustment

ft3/s/ft

10.76391042

0

-1

l/s/m

1000

0

-3

MGD/ft

6.956918689

0

0

US gal/min/ft

4831.193532

0

-3
CMDR Coliform Max Decay Rate (cfu/100ml)/day (MPN/100ml)/day (MPN/100ml)/day

Applicable to Model Network

Maximum decay rate for coliforms
COLOUR Colour Degree Hazen Degree Hazen Degree Hazen

Applicable to Asset Networks.

Unit of colour of water
CONDUCTIVITY Conductivity micro Siemens/cm micro Siemens/cm micro Siemens/cm

Applicable to Asset Networks.

Unit of electric conductivity
COST Cost £ $ $

Applicable to Model Networks

Used for damage curves

Unit

Multiplier

Offset

Precision Adjustment
$ 0

0

0
£ 0 0 6
€ 0 0 0
COSTAREA Cost per area £/m2 $/ft2 $/ft2

Applicable to Model Networks

Used for damage curves relative to area

Unit

Multiplier

Offset

Precision Adjustment
$/ft2

10.76391042

0

0
$/acre

0.000247105

0

3
$/ha 0.0001 0 4
$/km2 0.000001 0 6
£/ft2 10.76391042 0 0
£/acre 0.000247105 0 3
£/ha

0.0001

0

4
£/km2 0.000001 0 6
€/ft2 10.76391042 0 0
€/acre 0.000247105 0 3
€/ha

0.0001

0

4
€/km2 0.000001 0 6

CP

Coliform potency

cfu*10^9/kg

MPN*10^9/kg

MPN*10^9/kg

Applicable to Model Networks

Relative mass of coliform attachment
DENSITY Density kg/m3 kg/m3 kg/m3

Applicable to Model Networks

Unit of density
DRPM Change in speed rpm/s rpm/s rpm/s

Applicable to Model Networks

Used for Real Time Control
DC Diff Coeff m2/s ft2/s ft2/s

Applicable to Model Networks

Unit for diffusion coefficient

DQ

Change in Flow

m3/s/s

MGD/s

ft3/s/s

Applicable to Model Networks

Used for Real Time Control

Unit

Multiplier

Offset

Precision Adjustment

l/s/s

1000

0

-3

MGD/s

22.82453638

0

-1

ft3/s/s

35.31466672

0

-1

US gal/min/s

15850.37248

0

-4
DR Daily Rate DR DR DR

Applicable to Model Networks

Unit for a daily rate

DY

Change in Depth

m/s

ft/s

ft/s

Applicable to Model Networks

Used for Real Time Control

Unit

Multiplier

Offset

Precision Adjustment

ft/s

3.280839895

0

0

DZ

Change in Level

m/s

ft/s

ft/s

Applicable to Model Networks

Used for Real Time Control

Unit

Multiplier

Offset

Precision Adjustment

ft/s

3.280839895

0

0
ED Exponential decay 1/(mg/l) 1/(mg/l) 1/(mg/l) Applicable to Model Networks
ERODERATE Erosion rate mm/hr in/hr in/hr

Applicable to Model Networks

Unit

Multiplier

Offset

Precision Adjustment

in/hr

0.039370078

0

1

EV

Evaporation

mm/day

in/day

in/day

Evaporation Rate

Unit

Multiplier

Offset

Precision Adjustment

in/day

0.039370078

0

1
FRAC Fraction Fraction Fraction Fraction

A unitless measurement between 0-1 used primarily for SWMM control inputs for weirs, pumps, outlets and orifices

HEAD

Head

m

ft

ft

Applicable to Asset Networks

General unit of pressure relative to datum

Unit

Multiplier

Offset

Precision Adjustment

ft

3.280839895

0

0
HOURS Time interval hours hours hours

Applicable to Model Networks

Hydrograph interval

Unit

Multiplier

Offset

Precision Adjustment

minutes

60

0

-1
seconds 3600 0 -3
HR Hourly rate 1/hour 1/hour 1/hour

Applicable to Model Networks

Unit

Multiplier

Offset

Precision Adjustment
1/min 60 0 3
HT Heat Transfer 1/s 1/s 1/s Applicable to Model Networks
I Infiltration mm/hr in/hr in/hr

Applicable to Model Networks

Rate of infiltration

Unit

Multiplier

Offset

Precision Adjustment
mm/min 60 0 1

in/hr

0.039370078

0

1
in/min 0.000656167979 0 2

IF

Infiltration flow

m3/s/km2

MGD/acre

ft3/s/acre

Applicable to Model Networks

Ground surface infiltration

Unit

Multiplier

Offset

Precision Adjustment

ft3/s/acre

0.142913606

0

0

l/s/km2

1000

0

-3

MGD/acre

0.092367764

0

1

US gal/min/acre

64.14428069

0

-1
IN_C Concentration mg/l mg/l mg/l

Applicable to Asset Networks

General unit of concentration

Unit

Multiplier

Offset

Precision Adjustment

ppm

1

0

0
IN_COL_IE Coliforms (IE) cfu/100ml cfu/100ml cfu/100ml

Applicable to Model Networks

Coliforms Intestinal Enterococci (IE)

Counts of organisms per volume

Unit

Multiplier

Offset

Precision Adjustment

MPN/100ml

1

0

0
IN_COL_EC Coliforms (EC) cfu/100ml cfu/100ml cfu/100ml

Applicable to Model Networks

Coliforms Escherichia Coli (EC)

Counts of organisms per volume

Unit

Multiplier

Offset

Precision Adjustment

MPN/100ml

1

0

0
IN_FLUSHTIME Flush time min min min

Applicable to Distribution Asset Networks

Time of flushing for hydrant test object

IN_Q

Flow (distribution)

l/s

US Mgal/day

ft3/s

Applicable to Distribution Asset Networks

General unit of flow

Unit

Multiplier

Offset

Precision Adjustment

m3/day

86.4

0

-1

US Mgal/day

0.022824536

0

1

US gal/s

0.2641728747

0

0

US gal/min

15.85037244

0

-1

UK Mgal/day

0.0190053

0

1

UK gal/s

0.2199688

0

1

UK gal/min

13.198128

0

-1

UK gal/hour

791.88768

0

-2

Ml/day

0.0864

0

1

m3/hr

3.6

0

0

l/min

60

0

-1

ft3/s

0.03531466672

0

1

acre-ft/day

0.07004751264

0

1

m3/s

0.001

0

3
IN_RAD Radiation Dosage mrem/year in/year in/year

Applicable to Distribution Networks

Used for measurements of radiation in water

Unit

Multiplier

Offset

Precision Adjustment

in/year

0.039370078

0

1

L

Length

m

ft

ft

General unit of length

Unit

Multiplier

Offset

Precision Adjustment

ft

3.280839895

0

0

M

Mass

kg

kg

kg

Applicable to Model Networks

General unit of mass

MANH_DIM

Manhole Dimensions

mm

in

in

Applicable to Asset Networks

Used for various measures of manhole dimension, such as cover, shaft and chamber

Unit

Multiplier

Offset

Precision Adjustment

ft

0.00328084

0

2

in

0.039370078

0

1
m 0.001 0 3

MANH_Y

Manhole Depths

mm

in

in

Applicable to Asset Networks

Used for various vertical measures in a manhole, such as total depth, depth of silt and depth of flow

Unit

Multiplier

Offset

Precision Adjustment

ft

0.00328084

0

2

in

0.039370078

0

1
m 0.001 0 3

MC

Mass conc

mg/l

mg/l

mg/l

Applicable to Model Networks

Mass concentration

MCSI

Mass conc (result)

kg/m3

kg/m3

kg/m3

Applicable to Model Networks

Mass concentration (results data)

Unit

Multiplier

Offset

Precision Adjustment

mg/l

1000

0

-3

MCU

Mass conc

 Mass conc Mass conc Mass conc

Applicable to Model Networks

A unitless mass concentration mainly used in SWMM networks
MDR Maximum decay rate (mg/l)/day (mg/l)/day (mg/l)/day Applicable to Model Networks

MF

Mass flow

g/s

g/s

g/s

Applicable to Model Networks

Mass flow

MFSI

Mass flow (result)

kg/s

kg/s

kg/s

Applicable to Model Networks

Mass flow (results data)

Unit

Multiplier

Offset

Precision Adjustment

g/s

1000

0

-3

MFU

Mass flow

 Mass flow Mass flow Mass fow

Applicable to Model Networks

A unitless mass flow mainly used in SWMM networks
MIN Minutes minutes minutes minutes

Applicable to Model Networks

Time measurement
MOIST_DEF Soil moisture deficit Fraction Fraction Fraction

Applicable to Model Networks

Soil moisture deficit

Unit

Multiplier

Offset

Precision Adjustment

%

100.0

0

-2

NA

Area

m2

ft2

ft2

General unit of area

Unit

Multiplier

Offset

Precision Adjustment

ha

0.0001

0

4

km2

0.000001

0

6

ft2

10.76391042

0

0

acre

0.000247

0

3

PC

Pollutant mg/l

mg/l

mg/l

mg/l

Applicable to Model Networks

Pollutant quantifier - normally used for chemical constituents

PCC

Pollutant count/l

#/l

#/l

#/l

Applicable to Model Networks

Pollutant quantifier - normally used for biological constituents

PCU

Pollutant ug/l

ug/l

ug/l

ug/l

Applicable to Model Networks

Pollutant quantifier - normally used for chemical constituents

PD

Population density

person/ha

person/acre

person/acre

Applicable to Model Networks

Population density

Unit

Multiplier

Offset

Precision Adjustment

person/acre

0.404686267

0

0

PDR

UPM Pollutant Decay Rate

1/day

1/day

1/day

Applicable to Model Networks

Used in non-conservative water quality modelling

PP

Pollutant potency

kg/kg

kg/kg

kg/kg

Applicable to Model Networks

Relative mass of attachment
PRINT Print layout mm in in

Used for measurements in print layouts

Unit

Multiplier

Offset

Precision Adjustment

in

0.039370078

0

3
twip 56.7 0 3

PS

Pipe size

mm

in

in

Applicable to Model Networks

Used for all measurements of pipe size

Unit

Multiplier

Offset

Precision Adjustment

in

0.039370078

0

1
m 0.001 0 3

Q

Flow

m3/s

MGD

ft3/s

General unit of flow

Unit

Multiplier

Offset

Precision Adjustment

ft3/s

35.31466672

0

-1

l/s

1000

0

-3

MGD

22.82453638

0

-1

US gal/min

15850.37248

0

-4
Ml/day 86.4 0 -1
Ml/hr 3.6 0 0
m3/day 86400 0 -3
m3/hour 3600 0 -2

QD

Daily flow

l/day

US gal/day

ft3/day

Applicable to Model Networks

Consumption rate

Unit

Multiplier

Offset

Precision Adjustment

ft3/day

0.035314667

0

1

US gal/day

0.264172874

0

0

QU

UPM River Flow

l/s

l/s

l/s

Applicable to Model Networks

River flow rate

R

Rainfall intensity

mm/hour

in/hour

in/hour

General measure of rainfall intensity - the depth of rainfall over a period of time

Unit

Multiplier

Offset

Precision Adjustment

in/hour

0.039370078

0

1

RCF

Melt coefficient

mm/hour-C

in/hour-F

in/hour-F

Applicable to Model Networks

Used for snow melt coefficients in Snow Packs

Unit

Multiplier

Offset

Precision Adjustment

in/hour-F

0.021872265

0

0

RCW

Roughness (CW)

mm

in

in

Applicable to Model Networks

Colebrook White roughness

Unit

Multiplier

Offset

Precision Adjustment

ft

0.00328084

0

2

in

0.039370078

0

1

RD

Rainfall depth

mm

in

in

Rainfall depth

Unit

Multiplier

Offset

Precision Adjustment

in

0.039370078

0

1
RE Reaeration m/hr ft/hr ft/hr

Applicable to Model Networks

Unit

Multiplier

Offset

Precision Adjustment

ft/hr

3.280839895

0

0
RS Rate 1/s 1/s 1/s

Applicable to Model Networks

Unit to express rate of state change for regulators

RSD

Sediment Depth (results)

m

ft

ft

Applicable to Model Networks

Sediment Depth (results data)

Unit

Multiplier

Offset

Precision Adjustment

ft

3.280839895

0

0

mm

1000

0

-3

S

Gradient

m/m

%

%

General measure of gradient defined as a ratio of vertical to horizontal

Unit

Multiplier

Offset

Precision Adjustment

%

100

0

-2

m/km

1000

0

-3

SB

Surface build-up

kg/ha/day

kg/ha/day

kg/ha/day

Applicable to Model Networks

Washoff
SC Storage capacity mm in in

Applicable to Model Networks

Unit

Multiplier

Offset

Precision Adjustment

in

0.039370078

0

3
SETTL Settling rate (detrital C) mm/s ft/hour ft/hour

Applicable to Model Networks

Detrital carbon settling velocity

Unit

Multiplier

Offset

Precision Adjustment

ft/hour

11.8109871

0

0
SETVEL Settling velocity (sediment) m/hr ft/hr ft/hr

Applicable to Model Networks

Sediment settling velocity

Unit

Multiplier

Offset

Precision Adjustment

ft/hour

11.8109871

0

0
SHEARSTRESS Shear stress N/m2 lbf/ft2 lbf/ft2

Applicable to Model Networks

Unit

Multiplier

Offset

Precision Adjustment

lbf/ft2

0.0208854342

0

-3

SM

Surface mass

kg/ha

kg/ha

kg/ha

Applicable to Model Networks

Washoff (InfoWorks) or Initial build up (SWMM) networks
SR Solar Radiation W/m2 W/m2 W/m2 Applicable to Model Networks

STORAGEVOL

Storage Volume

m3

US Mgal

ft3

General unit of volume for storage

Unit

Multiplier

Offset

Precision Adjustment

ft3

35.31466672

0

-1

l

1000

0

-3

US gal

264.1728747

0

-2

US Mgal

0.000264

0

3
acre-ft 0.008107 0 3
SW_WEIRCOEFF SWMM weir coefficient m1/2/s ft1/2/s ft1/2/s

Applicable to SWMM networks

Weir discharge coefficient

Unit

Multiplier

Offset

Precision Adjustment

m1/2/s

1.811308890

0

-3
SW_SWEIRCOEFF SWMM side weir coefficient m1/3/s ft1/3/s ft1/3/s

Applicable to SWMM networks

Road and secondary discharge coefficient

Unit

Multiplier

Offset

Precision Adjustment

m1/3/s

1.485918577

0

-3
TD Time Days days days days Time interval

TS

Time

s

s

s

Time interval

Unit

Multiplier

Offset

Precision Adjustment

day

0.0000116

0

4
TURBIDITY Turbidity NTU NTU NTU

Applicable to Asset Networks

General unit of turbidity
UF Force per unit Length kN/m lbf/ft lbf/ft

Applicable to Model Networks

Force per unit of length

Unit

Multiplier

Offset

Precision Adjustment

lbf/f

68.5365387

0

1
UQ Unit Flow m2/s ft2/s ft2/s

Applicable to Model Networks

Flow per unit of length

Unit

  

Offset

Precision Adjustment

ft2/s

10.76391042

0

1
UHC Unit Headloss Coefficient 1/m 1/ft 1/ft

Applicable to Model Networks

Headloss coefficient per unit of length

V

Velocity

m/s

ft/s

ft/s

General unit of velocity.

Unit

Multiplier

Offset

Precision Adjustment

ft/s

3.280839895

0

0

VI

Viscosity

m2/s

 ft2/s ft2/s

General unit of viscosity.

Unit

Multiplier

Offset

Precision Adjustment

ft2/s

10.76391042

0

1

VO

Volume

m3

US Mgal

ft3

General unit of volume

Unit

Multiplier

Offset

Precision Adjustment

ft3

35.31466672

0

-1

l

1000

0

-3

US gal

264.1728747

0

-2

US Mgal

0.000264

0

3
acre-ft 0.008107 0 3

WN_AV

Rotation speed

rpm

rpm

rpm

General unit of speed for pumps

WN_COST

Cost

£

$

$

Applicable to Asset Networks

General unit of cost

WN_P

Pressure

m

psi

psi

Applicable to Asset Networks

General unit of pressure

Unit

Multiplier

Offset

Precision Adjustment

psi

1.4223

0

0

bar

0.0981

0

1

ft

3.280839895

0

0

in Hg

2.898

0

0

mm Hg

73.6092

0

-1

WN_POW

Power

kW

kW

kW

General unit of electrical power

Unit

Multiplier

Offset

Precision Adjustment

horsepower

1.341

0

0
WN_VO Volume (Distribution) Ml US Mgal ft3

Applicable to Distribution Asset Networks

General unit of volume

Unit

Multiplier

Offset

Precision Adjustment

ft3

35.31466672

0

-1

l

1000

0

-3

US gal

264.1728747

0

-2

US Mgal

0.000264

0

3
WQ_MPA Mass per area g/m2 lbm/ft2 lbm/ft2

Applicable to Model Networks

Unit

Multiplier

Offset

Precision Adjustment
lbm/ft2 0.000204514

0

3
lbm/in2 0.00000142232

0

5

WS

Wind Speed

km/hour

mph

mph

Applicable to Model Networks

General unit of wind speed

Unit

Multiplier

Offset

Precision Adjustment

knot

0.539956803

0

0

m/s

0.277777778

0

0

mph

0.621371192

0

0

XY

X-Y co-ordinate

m

ft

ft

Unit for all location coordinates

Unit

Multiplier

Offset

Precision Adjustment

ft

3.280839895

0

0

US Survey ft

3.280833437

0

0

Y

Depth

m

ft

ft

Measure of relative depth

Unit

Multiplier

Offset

Precision Adjustment

ft

3.280839895

0

0

Z

Height above datum

m AD

ft AD

ft AD

Height above datum. Used with XY to define an exact position

Unit

Multiplier

Offset

Precision Adjustment

ft AD

3.280839895

0

0

Network Data Fields

Changing the Display Units