SWMM5 Conversion - Nodes

Information from the following sections of the SWMM5 project file are imported to InfoWorks ICM Node objects: 

[JUNCTIONS] Section

SWMM5 Junctions are imported as InfoWorks ICM nodes with the following properties:

The SWMM5 Junction data is imported as described in the table below:

SWMM5

Description

InfoWorks ICM Data Field

Name

Junction ID

Node ID

Elev

Elevation of junction invert

Chamber Floor Level

Ymax

Depth from ground to invert elevation

Ground Level and Flood Level calculated as:

Elev + Ymax

 

If APond > 0 and ALLOW_PONDING has been set in the [OPTIONS] section

Flood Level calculated as:

Elev + Ymax + Ysur

Y0

Water depth at start of simulation

User Number 1

(Initial depth in metres. Initial depth does not need to be set as InfoWorks automatically initialises levels.)

Ysur

Maximum additional head above ground elevation that manhole junction can sustain under surcharge conditions.

Used to calculate Flood Level if ALLOW_PONDING has been set in the[OPTIONS] section (see Ymax).

Apond

Area subjected to surface ponding once water depth exceeds Ymax

Floodable Area

(Only used if ALLOW_PONDING has been set in the [OPTIONS] section.)

 

If Apond = 0, IW Flood Type is set to Lost

If Apond > 0 IW Flood Type is set to Stored

[OUTFALLS] Section

SWMM5 Outfalls are imported as InfoWorks ICM nodes of type Outfall with X and Y coordinates as specified in the [COORDINATES] section.

The SWMM5 Outfall data is imported as described in the table below:

SWMM5

Description

InfoWorks ICM Data Field

Name

Outfall ID

Node ID

Elev

Invert Elevation

User Number 1

(Invert Elevation in metres. No InfoWorks equivalent)

Gate

Indicates whether a flap gate is present to prevent reverse flow

If Gate is set to NO, outfall is imported as an InfoWorks Node of type Outfall.

If Gate is set to YES, outfall is imported as a series of Node, Flap Valve and Outfall.

The flap valve diameter will be set to the smaller of the height or width of the incoming conduit.

If the outfall is not attached to a conduit the diameter is taken from the next link upstream if possible. Otherwise the flap valve is assumed to be 1m wide.

Stage

Elevation of fixed stage outfall

User Number 2

(Elevation of fixed stage outfall in metres. No InfoWorks ICM equivalent)

Tcurve

Name of curve containing tidal height v. hour of day over a complete tidal cycle

User Text 1

(No InfoWorks ICM equivalent)

Tseries

Name of time series section that describes how outfall Gate stage varies with time

User Text 2

(No InfoWorks ICM equivalent)

[DIVIDERS] Section

There is no InfoWorks ICM equivalent to the SWMM5 Divider node. SWMM5 Dividers are imported as InfoWorks ICM nodes (in the same way as SWMM5 Junctions) with the following properties: 

The SWMM5 Divider data is imported as described in the table below:

SWMM5

Description

InfoWorks ICM Data Field

Name

Divider ID

Node ID

Elev

Elevation of junction invert

Chamber Floor Level

DivLink

Name of link to which flow is diverted

User Text 1

(No InfoWorks ICM equivalent)

Qmin

Flow at which diversion begins for either a CUTOFF or WEIR divider

Dcurve

Name of curve for divider that relates diverted flow to total flow

Ht

Height of WEIR divider

Cd

Discharge coefficient for WEIR divider

Ymax

Depth from ground to invert elevation

Ground Level and Flood Level calculated as:

Elev + Ymax

 

If APond > 0 and ALLOW_PONDING has been set in the [OPTIONS] section

Flood Level calculated as:

Elev + Ymax + Ysur

Y0

Water depth at start of simulation

User Number 1

(Initial depth in metres. Initial depth does not need to be set as InfoWorks automatically initialises levels.)

Ysur

Maximum additional head above ground elevation that manhole junction can sustain under surcharge conditions.

Used to calculate Flood Level if ALLOW_PONDING has been set in the[OPTIONS] section (see Ymax).

Apond

Area subjected to surface ponding once water depth exceeds Ymax

Floodable Area

(Only used if ALLOW_PONDING has been set in the [OPTIONS] section.)

 

If Apond = 0, IW Flood Type is set to Lost

If Apond > 0 IW Flood Type is set to Stored

[STORAGE] Section

SWMM5 Storage objects are imported as InfoWorks ICM nodes of type Storage with X and Y coordinates as specified in the [COORDINATES] section.

The SWMM5 Storage data is imported as described in the table below:

SWMM5

Description

InfoWorks ICM Data Field

Name

Storage Node ID

Node ID

Elev

Elevation of junction invert

Chamber Floor Level

Ymax

Depth from ground to invert elevation

Flood Level and Ground Level calculated as:

Elev + Ymax

Y0

Water depth at start of simulation

User Number 1

(Initial depth in metres. Initial depth does not need to be set as InfoWorks automatically initialises levels.)

Acurve

Name of curve in [CURVES] section with surface area (ft2 or m2) as a function of depth (ft or m) for TABULAR geometry.

Used to determine Area and Depth values from the [CURVES] section of the SWMM5 file.

SWMM5 [CURVES] field

InfoWorks ICM Data Field

X (surface area)

Plan Area field of Storage Parameters grid.

Y (depth)

Level field of Storage Parameters grid.

Level is calculated as:

Y (depth)+ Elev

A1

Coefficient of FUNCTIONAL relation between surface area and depth

Level / Plan Area fields of Storage Parameters grid.

A 15 point Depth / Plan Area profile is determined between Depth = 0 and Depth = Ymax using the functional relationship:

A0 + A1 x DepthA2

Depths are converted to levels by:

Level = Depth + Elev

A2

Exponent of FUNCTIONAL relation between surface area and depth

A0

Constant of FUNCTIONAL relation between surface area and depth

Apond

Area subjected to surface ponding once water depth exceeds Ymax

Floodable Area

(Only used if ALLOW_PONDING has been set in the [OPTIONS] section.)

 

If Apond = 0, IW Flood Type is set to Lost

If Apond > 0 IW Flood Type is set to Stored

SWMM5 Conversion Notes

Importing SWMM5 Network Data

SWMM5 Conversion - Links

SWMM5 Conversion - Subcatchments