SWMM5 Network Export from an InfoWorks Network

To export an InfoWorks network to a SWMM5 file:

1. In the Explorer window, right-click on the network to be exported.
2. Select Export | to SWMM5 from the popup menu. The Select Network Version and Scenario dialog will be displayed.
3. In this dialog, choose which scenario is to be exported from the dropdown list. Select which version of the scenario is to be exported by clicking on the # button. This displays the Select Commit dialog from which you can select the appropriate version.
4. Specify the file to which the network is to be exported.
5. Click on OK to export the file. The file will be saved with a default file extension .inp.

Alternatively, with a network open select Export | To SWMM5 files from the Network menu. (When using this method, the latest version of the current scenario will be exported.) Specify a file name for the file that is to be exported as a SWMM5 text from the Save As dialog. Click on OK to export the file.

This topic contains the following sections detailing export of InfoWorks ICM data to SWMM5 data format:

• Exporter Limitations
• General
• Subcatchments
• Nodes
• Links
• Controls
• Curves
• Coordinates

Exporter Limitations

The exporter currently supports asset data and export to the DWF section of the SWMM5 data file only.

The table below lists the SWMM5 sections that are not exported and the reason that the section is not exported:

SWMM5 section	Exporter Limitation
Raingages Evaporation Temperature Inflows Patterns Timeseries	Event Data - the exporter currently supports asset data only (with the exception of DWF and RTK Hydrograph data).
Pollutants Landuses Coverages Buildup Washoff Erosion Sediment Treatment Loadings	SWMM quality modelling is not directly equivalent to quality modelling in InfoWorks ICM
Report Files Dividers	No InfoWorks ICM equivalent
Snowmelt Snowpack	Not currently supported
Groundwater Aquifers	SWMM Groundwater modelling is not directly equivalent to groundwater modelling in InfoWorks ICM

General

The network description on the Description Page of the network Property Sheet is exported to the [TITLE] section of the SWMM5 file.

Options

The SWMM5 OPTIONS section defines system properties and analysis options. The majority of options are not set on export and will be set to the SWMM5 default values.

The following options are set on export:

• Flow Units
• Infiltration
• Allow Ponding

Flow Units

InfoWorks ICM networks are exported to SWMM5 data files with units based on the flow units that the user currently has set in InfoWorks ICM.

Infiltration

SWMM supports one runoff volume model per network. If more than one of the SWMM5 infiltration models is used in the InfoWorks ICM network, the exporter sets the Infiltration field to MIXED. This will generate an error message in SWMM5. Infiltration parameters will not be exported to the SWMM5 INFILTRATION section.

Runoff volume models in SWMM can be: Horton (exported as "HortonSWMM"), Green-Ampt or Curve Number. Any other InfoWorks ICM runoff volume models are exported as "HortonSWMM". If more than one runoff volume model is used in the InfoWorks ICM network, Infiltration parameters will be exported as zero to the SWMM5 INFILTRATION section.

Allow Ponding

This field is set to NO if the flood type for manhole nodes is set to "LOST", or YES if the flood type is "STORED".

If there is a mixture of "STORED" and "LOST" flood types in the network, this field will be set to YES, and a warning message will be exported to the SWMM5 file.

Subcatchments

Subcatchment information is exported to the SUBCATCHMENTS, INFILTRATION and DWF sections of the SWMM5 file.

Runoff Surface information is exported to the SUBAREAS and INFILTRATION sections of the SWMM5 file.

RTK Hydrograph information is exported to the HYDROGRAPHS and RDII sections of the SWMM5 file.

SUDS Controls information is exported to the LID_USAGE section of the SWMM5 file.

SUDS Control object information is exported to the LID CONTROLS section of the SWMM5 file.

SUBCATCHMENT section

Field mappings and conversions of InfoWorks ICM Subcatchment fields to SWMM5 SUBCATCHMENT fields:

SWMM5 Parameter	InfoWorks ICM Export
Name	Subcatchment ID
Raingage	Rainfall Profile
Outlet	Node ID
Area	Total Area
%Imperv	%Imperv = 100 x (Sareaimp/ Sareas) where: Sareaimp = sum of surface areas of type impervious Sareas = sum of surface areas (The exporter treats surfaces of type "unknown" as pervious for the purposes of calculating %Imperv)
Width	Dimension
Slope	Slope
Clength	Zero (There is no equivalent in InfoWorks ICM to this field)
Runoff Surface	Runoff Surface information is exported to the SUBAREAS section of the SWMM5 file.

DWF section

Data is exported to the DWF section of the SWMM5 file for subcatchments with non-zero Additional Foul Flow or non-zero Population fields.

Note: Patterns are not exported for the dry weather flow profile names created. These must be created in SWMM.

Field mappings and conversions of InfoWorks ICM Subcatchment fields to SWMM5 DWF fields:

SWMM5 Parameter	InfoWorks ICM Export
Node	Node ID
Item	FLOW
Value	For subcatchments with non-zero Additional Foul Flow: Additional Foul Flowvalue (exported to SWMM5 units) For subcatchments with non-zero Population: Population value
Pat 1	For subcatchments with non-zero Additional Foul Flow: MONTHLY_AFF_<wastewater profile> For subcatchments with non-zero Population: MONTHLY_POP_<wastewater profile>
Pat 2	For subcatchments with non-zero Additional Foul Flow: HOURLY_AFF_<wastewater profile> For subcatchments with non-zero Population: HOURLY_POP_<wastewater profile>
Pat 3	For subcatchments with non-zero Additional Foul Flow: WEEKEND_AFF_<wastewater profile> For subcatchments with non-zero Population: WEEKEND_POP_<wastewater profile>
Pat 4	Not used.

 

SUBAREA section

Field mappings and conversions of InfoWorks ICM Runoff Surfaces fields to SWMM5 SUBAREA fields:

SWMM5 Parameter	InfoWorks ICM Export
Subcatch	Subcatchment ID
Imperv_N	Runoff Routing Value for Impervious surfaces using SWMM Routing Model. If more than one surface is Impervious, the value exported is an average weighted by surface area. If Routing Model is not SWMM, Imperv_N exported as zero.
Perv_N	Runoff Routing Value for Pervious surfaces using SWMM Routing Model. If more than one surface is Pervious, the value exported is an average weighted by surface area. If Routing Model is not SWMM, PervN exported as zero.
Imperv_S	Initial Loss Value for Impervious surfaces. Slope related values are converted to absolute values. If more than one surface is Impervious, the value exported is an average weighted by surface area.
Perv_S	Initial Loss  Value for Pervious surfaces. Slope related values are converted to absolute values. If more than one surface is Pervious, the value exported is an average weighted by surface area.
PctZero	Percent of impervious area with no depression storage: PctZero = Sum of areas of Impervious surfaces with no initial loss/Sum of areas of impervious surfaces
RouteTo	OUTLET

INFILTRATION section

The following values are exported from ICM Subcatchments to the INFILTRATION section of the SWMM5 file:

SWMM5 Parameter	InfoWorks ICM Export
Subcatch	Subcatchment ID
CurveNo	The Curve number value is exported to CurveNo when the Runoff volume type is set to CN or CNSWMM for the Runoff Surface that is associated with a Land Use that is associated with the subcatchment. If the Runoff volume type is set to SCS, the value exported to CurveNo is a calculated Runoff Curve Number, which is described in Curve Number Infiltration. If a Land Use object, associated with the subcatchment, is associated with Runoff Surfaces that have one Runoff volume type set to CN and another set to SCS, the exported Curve number is an area-weighted sum of both the subcatchment Curve number and the calculated Runoff Curve Number.
DryTime	Drying Time

Infiltration parameters on the Runoff Surfaces tab of the subcatchments grid are also exported to the INFILTRATION section of the SWMM5 file.

The export of infiltration parameters depends on the infiltration model being used. Infiltration parameters are exported as zero for any subcatchments that do not use the infiltration model defined in the OPTIONS section of the SWMM5 file.

Horton Infiltration

Field mappings and conversion of InfoWorks ICM Runoff Surface fields to SWMM5 INFILTRATION fields when using Horton Runoff Volume Type:

SWMM5 Parameter	InfoWorks ICM Export
MaxRate	Initial Infiltration
MinRate	Limiting Infiltration
DecayRate	Decay factor
DryTime	Horton Drying Time
MaxInfil	Horton Max Infiltration Volume

Green-Ampt Infiltration

Field mappings and conversions of InfoWorks ICM Runoff Surface fields to SWMM5 INFILTRATION fields when using Green-Ampt Runoff Volume Type:

SWMM5 Parameter	InfoWorks ICM Export
Suction	Green Ampt Suction
Conduct	Green Ampt Conductivity
InitDef	Green Ampt Deficit

Curve Number Infiltration

Field mappings and conversions of InfoWorks ICM Runoff Surface fields to SWMM5 INFILTRATION fields when using SCS / CN Runoff Volume Type:

SWMM5 Parameter	InfoWorks ICM Export
CurveNo	Runoff Curve Number When using SCS Runoff Volume Type, Storage depth is converted to CN using: S = (1000/CN - 10) * 0.0254 where: S in meters
Conduct	Zero
Regen	Zero

HYDROGRAPHS section

RTK Hydrograph parameters on the RTK Hydrograph tab and applicable Monthly RTK Hydrograph tab of the subcatchments grid are exported to the HYDROGRAPHS section of the SWMM5 file.

For model networks which were created using an earlier version of InfoWorks ICM than version 8.0, and which have not been subsequently updated, then for cases where the RTK Hydrograph is associated with different rainfall profiles, a hydrograph will be exported for each rainfall profile that it is used with. This does not apply from version 8.0 onwards, as the same rainfall profile must be specified for all subcatchments that use the same RTK hydrograph.

SWMM5 Parameter	InfoWorks ICM Export
Name	RTK Hydrograph ID appended by rainfall profile number
Raingage	Rainfall Profile to which RTK Hydrograph is applied
Month	ALL (for RTK Hydrograph) Appropriate Month(s) (for Monthly RTK Hydrograph)
R1, R2, R3	R1, R2, R3
T1, T2, T3	T1, T2, T3
K1, K2, K3	K1, K2, K3
Dmax1, Dmax2, Dmax3	Max depth - Short term, Max depth - Medium term, Max depth - Long term
Drec1, Drec2, Drec3	Recovery rate- Short term, Recovery rate- Medium term, Recovery rate- Long term
D01, D02, D03	Starting depth - Short term, Starting depth - Medium term, Starting depth - Long term

Nodes

Node data is exported to the JUNCTIONS, OUTFALLS or STORAGE section of the SWMM5 file, depending on the type of node.

Field mappings and conversions of InfoWorks ICM node fields to SWMM5 node fields:

SWMM5 Parameter	InfoWorks ICM Export
Name	Node ID
InvertEl	Chamber Floor Level
MaxDepth	MaxDepth = Ground Level- Chamber Floor Level
InitDepth	Exported as Zero. (There is no equivalent in InfoWorks ICM, as InfoWorks ICM automatically initialises levels.)

Manhole / Break nodes

Manhole and break node data is exported to the Junctions section of the SWMM5 file.

SWMM5 Parameter	InfoWorks ICM Export
SWMM5 Parameter	InfoWorks ICM Export
SurDepth	Lost/Stored Flood Type = Zero Sealed Manholes = 999 m (3277.6 ft)
Ponded Area	Floodable Area

Outfalls

All outfalls are exported as FREE outfalls with NO flap gate.

Outfall node data is exported to the Outfalls section of the SWMM5 file.

Storage nodes

Storage node data is exported to the Storage section of the SWMM5 file.

Storage Nodes are exported as Type TABULAR. The Level/Plan Area Grid defining the shape of the storage node on the Storage Parameters Page of the Node Property Sheet is exported to the Curvessection of the SWMM5 file. The Table name is exported as the Storage Node ID.

Links

Link data is exported to the CONDUITS section of the SWMM5 file.

Common link data fields:

SWMM5 Parameter	InfoWorks ICM Export
Name	Link ID
Node1	US Node ID
Node2	DS Node ID

Conduits

Conduit data is exported to the CONDUITS section of the SWMM5 file.

The culvert code for a conduit with a Conduit type set to Culvert, and the conduit cross section data, are exported to the XSECTION section of the SWMM5 file.

The upstream and downstream headloss coefficients of a conduit, and the inlet and outlet headloss coefficients for a conduit with a Conduit type set to Culvert, are exported to the LOSSES section of the SWMM5 file.

SWMM5 Parameter	InfoWorks ICM Export
Length	Length
Nvalue	Top Roughness (A warning message will be generated in the exported SWMM5 text file if the Top Roughness differs from the Bottom Roughness)   Colebrook-White values are converted to N by: N = 0.038 x ks1/6 where: ks in metres   Hazen-Williams values are converted to N by: Where: conduit_height is in ft   (If conduit gradient is zero, the above equation will fail. For conduits with zero gradient, a gradient value of 0.0001 will be used for conversion purposes.)
Zup	US Invert Level - Chamber Floor Level (US Node)
Zdown	DS Invert Level - Chamber Floor Level (DS Node)
InitFlow	Zero

Flap valves

Flap valves are exported to the CONDUITS section of the SWMM5 file. Flap Valves are exported with a nominal length of 1m (3.28ft). Backflow is prevented by including an entry in the LOSSES section.

The cross-section data for flap valves is defined in the XSECTION section of the SWMM5 file.

Pumps

Pump On and Off levels are exported as CONTROLS.

Field mappings and conversions of InfoWorks ICM Pump data to SWMM5 PUMP fields:

SWMM5 Parameter	InfoWorks ICM Export
CurveName	Pump ID (The Head Discharge table is exported to the CURVES section of the SWMM5 file.)
InitStatus	This is not exported as it is event data. SWMM5 default value = ON

Orifices / Sluice gates

All orifices and sluice gates are exported as an orifice of Type SIDE with NO flap gate.

Orifice and Sluice Gate data is exported to the ORIFICE section of the SWMM5 file.

The geometry of the orifice opening is defined in the XSECTION section of the SWMM5 file.

Field mappings and conversions of InfoWorks ICM Orifice and Sluice Gate data to SWMM5 ORIFICE fields:

SWMM5 Parameter	InfoWorks ICM Export
Type	SIDE
Height	Height = Invert Level- Chamber Floor Level (US node)
Cd
Flap Gate	NO

Weirs

The geometry of the weir opening is defined in the XSECTION section of the SWMM5 file.

Field mappings and conversions of InfoWorks ICM Weir data to SWMM5 WEIRS fields:

SWMM5 Parameter	InfoWorks ICM Export
Type	InfoWorks ICM Weir Type SWMM5 Type BRWEIR UNKNOWN COWEIR TRANSVERSE TRIWEIR TRAPEZOIDAL VCWEIR TRANSVERSE VNWEIR TRANSVERSE VWWEIR TRANSVERSE WEIR TRANSVERSE
Height	Crest - Chamber Floor Level (US node)
Cd	Discharge Coefficient
Flap Gate	NO
EC	Zero for all types

Outlets

User defined links, culvert inlet, culvert outlet, flume, screen and siphon links are exported to the OUTLETS section of the SWMM5 file.

Field mappings and conversions of InfoWorks ICM link data to SWMM5 OUTLETS fields:

SWMM5 Parameter	InfoWorks ICM Export
Height	Crest or Invert Level- Chamber Floor Level (US node)
Discharge Curve	TABULAR
Qtable	Link ID Note The Head Discharge table for User Defined Links is exported to the Curves section of the SWMM5 file. H-Q curves must be defined by the user for all other Link types exported as outlets.
Flap Gate	NO

River Channel sections

River channel sections are exported to the CONDUITS section of the SWMM5 file.

The cross-section geometry of channel river sections is defined in the XSECTION and TRANSECTS sections of the SWMM5 file.

Cross sections

Conduit culvert data and cross section data for conduits, river channels, orifices, sluices, flap valves and weirs are exported to the XSECTION section of the SWMM5 file.

For culvert type of conduits:

SWMM5 Parameter	InfoWorks ICM Export
Culvert	Culvert code
Barrels	Number of barrels

 

For regular shaped sections:

SWMM5 Parameter	InfoWorks ICM Export
Link	Link ID
Shape	See Shape Table below.
Geom1	Height Diameter for Flap Valves
Geom2	Width
Geom3	Left Side Slope for Trapezoidal sections 0.249328 for Trapezoidal Weirs Zero for all other shapes
Geom4	Right Side Slope for Trapezoidal sections Zero for all other shapes

For river channel sections:

SWMM5 Parameter	InfoWorks ICM Export
Link	Link ID
Shape	IRREGULAR
Transect	Link ID

Cross Section shape types

InfoWorks ICM Link Type	SWMM5 Shape
Conduit	InfoWorks ICM Shape ID SWMM5 Shape ARCH MODBASKETHANDLE CIRC CIRCULAR CNET UNKNOWN EGG EGG EGG2 UNKNOWN OEGB UNKNOWN OEGN UNKNOWN OREC RECT_OPEN OTx:y TRAPEZOIDAL OU UNKNOWN OVAL UNKNOWN RECT RECT_CLOSED UTOP RECT_ROUND User UNKNOWN If there is no SWMM5 equivalent to the CS Shape ID, a Shape of "UNKNOWN" is exported. This will create an error message in SWMM5 when the file is opened.
Flap Valve	CIRCULAR
Orifice	CIRCULAR
Sluice Gate	RECT_CLOSED
Weir	InfoWorks ICM Weir Type SWMM5 Shape BRWEIR RECT_OPEN COWEIR RECT_OPEN TRIWEIR TRAPEZOIDAL VCWEIR RECT_OPEN VNWEIR TRIANGULAR VWWEIR RECT_OPEN WEIR RECT_OPEN

Transects

The cross-section geometry of river channel sections is exported to the TRANSECTS section of the SWMM5 file.

Field mappings and conversions of InfoWorks ICM river channel data to SWMM5 TRANSECTS fields:

SWMM5 Parameter	InfoWorks ICM Export
Nleft	Rough. The roughness value in the Cross-Section grid up to the first panel marker
Nright	Rough. The roughness value in the Cross-Section grid after the last panel marker
Nchannel	Rough. The roughness value in the Cross-Section grid between panel markers
Name	Channel Link ID
Nsta	Number of entries in River Channel Cross-Section grid
Xleft	The X Coord. value in the Cross-Section grid of the first section that has a new panel set. If there are no panel markers, this is the first X value in the grid.
Xright	X Coord. The X Coord. value in the Cross-Section grid of the last section that has a new panel set. If there are no panel markers, this is the last X value in the grid.
Wfactor	Zero
Eoffset	US Invert Level
Station(n)	X Coord. The X Coord. value in the Cross-Section grid for grid entry (n), where (n) = 1 to Nsta.
Elevation(n)	Depth The Depth value in the Cross-Section grid for grid entry (n), where (n) = 1 to Nsta.

Minor losses

The upstream and downstream headloss coefficients of a conduit, and the inlet and outlet headloss coefficient for a culvert type of conduit, are exported to the LOSSES section of the SWMM5 file. Entries are also included for flap valves to prevent backflow in the conduit.

SWMM5 Parameter	InfoWorks ICM Export
Conduit	Conduit ID
Kentry	Inlet headloss coefficient
Kexit	Outlet headloss coefficient
EntryLoss	US Headloss Coefficient For Headloss Type of NORMAL or HIGH, the headloss coefficient is multiplied by 0.15.
ExitLoss	DS Headloss Coefficient For Headloss Type of NORMAL or HIGH, the headloss coefficient is multiplied by 0.015
AvgLoss	Zero
FlapGate	Conduit = NO Flap Valve = YES

Controls

Pump On and Off levels are exported as controls.

Click on the image below to display the example.

Curves

Level/Plan Area grids for Storage Nodes are exported to the CURVES section of the SWMM5 file.

Head Discharge tables for Pumps and User Control Links are exported to the CURVES section of the SWMM5 file.

SWMM5 Parameter	InfoWorks ICM Export
Name	Link ID
Type	InfoWorks ICM Object SWMM5 Type Storage Node STORAGE FixPmp PUMP2 VSPmp PUMP2 RotPmp PUMP3 ScrPmp PUMP4 User Defined Link RATING
X(n)	SWMM5 Type InfoWorks ICM Export STORAGE X(n) = Level(n) - Level(n=1) where: n = grid entry on Level/Plan Area grid PUMP2 X = Zero PUMP3, PUMP4, RATING X(n) = Head(n) where: n = grid entry on Head Discharge grid
Y(n)	SWMM5 Type InfoWorks ICM Export STORAGE Y(n) = Area(n) where: n = grid entry on Level/Plan Area grid PUMP2 Y = Discharge PUMP3, PUMP4, RATING Y(n) = Discharge(n) where: n = grid entry on Head Discharge grid

Coordinates

X and Y coordinates of nodes are exported to the COORDINATES section of the SWMM5 file.

X and Y coordinates of bends in links are exported to the VERTICES section of the SWMM5 file.

X and Y coordinates of vertices in polygons are exported to the POLYGONS section of the SWMM5 file.