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SWMM5 Conversion - Subcatchments (SWMM)

Information from the following sections of the SWMM5 file are imported to InfoWorks ICM SWMM networks objects on the Subcatchments grid:

  • [SUBCATCHMENTS]
  • [POLYGONS]
  • [SUBAREAS]
  • [INFILTRATION]
  • [LID_USAGE]
  • [GROUNDWATER]
  • [LOADINGS]
  • [COVERAGES]
  • [GWF]
  • [LID_CONTROLS]
  • [LANDUSES]
  • [WASHOFF]
  • [BUILDUP]
  • [POLLUTANT]
  • [SNOWPACK]
  • [AQUIFIER]
  • [Innovyze_Supplementary_Infiltration]

[SUBCATCHMENTS]

The [SUBCATCHMENTS] section is imported into a SWMM Subcatchment network object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Data Field

Notes

Name

Subcatchment ID

Rgage

Raingage ID

OutID

Outlet

The name of the node or the subcatchment that receives runoff from the subcatchment.

Drains to

If the OutID is a node, the Drains to field in ICM is set to sw_node.

If the OutID is a subcatchment, the Drains to field in ICM is set to sw_subcatchment.

Area

Area

%Imperv

Imperviousness

Width

Subcatchment Width

Slope

Slope

Clength

Curb length

Total Curb Length

Spack

Snow pack ID

The snow pack object is imported from the [SNOWPACKS] section.

[POLYGONS]

The [POLYGONS] section is imported into a SWMM network Subcatchment object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Subcatchment Data Field

Notes
X Geometry of the subcatchment boundary is determined from the X and Y coordinate data in the [POLYGONS] section
Y

[SUBAREAS]

The [SUBAREAS] section is imported to a SWMM network Subcatchment object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Subcatchment Data Field

Notes
Subcat ~ Used to determine which Subcatchment the SWMM5 [SUBAREA] applies to.
%Zero Percent no storage
%Routed Percent routed
Nimp Impervious roughness
Nperv Pervious roughness
RouteTo Routing
Simp Impervious storage depth
Sperv Pervious storage depth

[INFILTRATION]

The Subcat field in the [INFILTRATION] section is used to determine which subcatchment the infiltration data is applied to.

If the [INFILTRATION] section contains any entries that have their last parameter set to a specific infiltration model, then this determines which subcatchment fields the infiltration data is imported to in ICM. If there is no entry for the last parameter, then the infiltration model set in the SWMM5 [OPTIONS] section will determine which fields the data is imported to.

Horton/Modified Horton Infiltration

SWMM5 Field

InfoWorks ICM Data Field

Notes

MaxRate

Initial infiltration

MinRate

Limiting infiltration

Decay

Decay factor

DryTime

Drying time

MaxInf

Maximum infiltration volume

Green-Ampt /Modified Green-Ampt Infiltration

SWMM5 Field

InfoWorks ICM Subcatchment Data Field

Notes

Suction

Average capillary suction

Ksat

Saturated hydraulic conductivity

IMD

Initial moisture deficit

Curve Number Infiltration

SWMM5 Field

InfoWorks ICM Subcatchment Data Field

Notes
CurveNo Curve number
Ksat Saturated hydraulic conductivity Although imported, it is not used in InfoWorks ICM as deprecated in SWMM5.
DryTime Drying time

[LID_USAGE]

The [LID_USAGE] section is imported into the SUDS/LID control fields in a SWMM Subcatchment network object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Subcatchment Data Field

Notes
Subcat ~ Used to identify the subcatchment to which the LID_USAGE section is imported.
LIDS structure ID Generated on import.
LID LIDS control ID
Number Number of units
Area Area
Width Unit surface width
InitSat Initial saturation
FromImp Impervious area treated
FromPerv Pervious area treated
ToPerv Outflow to
DrainTo Drain to subcatchment
DrainTo Drain to node

[GROUNDWATER]

The [GROUNDWATER] section is imported into a SWMM Subcatchment network object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Subcatchment Data Field

Notes
Subcat ~ Used to identify the subcatchment to which the GROUNDWATER section is imported.
Ebot Aquifer elevation If blank or set to * in the SWMM5 file, the Aquifer elevation field is blank (i.e. no value is set) in ICM.
Aquifer Aquifer ID
Egw Aquifer initial ground water elevation If blank or set to * in the SWMM5 file, the Aquifer initial ground water elevation field is blank (i.e. no value is set) in ICM.
Umc Aquifer initial ground water moisture content If blank or set to * in the SWMM5 file, the Aquifer initial ground water moisture content field is blank (i.e. no value is set) in ICM.
Node Aquifer node ID
Esurf Elevation
A1 Groundwater coefficient
B1 Groundwater exponent
Egwt Groundwater threshold If blank or set to * in the SWMM5 file, the Groundwater threshold field is blank (i.e. no value is set) in ICM.
A2 Surface coefficient
Dsw Surface depth
B2 Surface exponent
A3 Surface groundwater coefficient

[LOADINGS]

The [LOADINGS] section is imported into a SWMM network Subcatchment object in InfoWorks ICM.

SWMM5 Parameter

InfoWorks ICM Subcatchment Data Field

Notes
Subcat ~ Used to identify the subcatchment to which the LOADINGS section is imported.
Pollut Initial buildup The SWMM5 Pollut and InitBuildup values are imported to the Pollutant and Initial buildup columns of the subcatchment's Initial Buildup grid.
InitBuildup

[COVERAGES]

The [COVERAGES] section is imported into a SWMM network Subcatchment object in InfoWorks ICM. Multiple LandUse/Percent values found on a single line in [COVERAGES] section will be imported. They will also be imported if they are on multiple lines, provided that the subcatchment name (Subcat) precedes the LandUse/Percent values on the subsequent lines.

SWMM5 Field

InfoWorks ICM Subcatchment Data Field

Notes
Subcat ~ Used to identify the subcatchment to which the COVERAGES section is imported.
Landuse Land uses

The SWMM5 Landuse and Percent values are imported to the Land use and Area % columns of the subcatchment's Land Uses grid.

Percent

[GWF]

The [GWF] section is imported into a SWMM network Subcatchment object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Subcatchment Data Field

Notes
Subcat ~ Used to identify the subcatchment to which the GWF section is imported.
LATERAL Expr Lateral groundwater flow equation Imported equations can be viewed in the Groundwater Flow Equation Editor which is accessed from the relevant groundwater flow equation data field in the applicable subcatchment's properties.
DEEP Expr Deep groundwater flow equation

[LID_CONTROLS]

The [LID_CONTROLS] section is imported as a SWMM network LID Control in object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM LID Control Data Field

Notes
Name Control ID
Type Control type
SURFACE StorHt Berm height
SURFACE VegFrac Vegetation volume fraction
SURFACE Rough Surface roughness (Manning's n)
SURFACE Slope Surface slope
SURFACE Xslope Swale side slope
PAVEMENT Thick Pavement thickness
PAVEMENT Vratio Pavement void ratio
PAVEMENT FracImp Impervious surface fraction
PAVEMENT Perm Permeability
PAVEMENT Vclog Pavement clogging factor
PAVEMENT regenDays Regeneration interval
PAVEMENT regenDegree Regeneration fraction
SOIL Thick Soil thickness
SOIL Por Soil porosity
SOIL FC Field capacity
SOIL WP Wilting point
SOIL Ksat Conductivity
SOIL Kcoeff Conductivity slope
SOIL Suct Suction head
STORAGE Height Storage thickness

Barrel height

STORAGE Vratio Storage void ratio
STORAGE Seepage Seepage rate
STORAGE Vclog Storage clogging factor
DRAIN Coeff Coefficient for flow in flow units
Flow capacity
DRAIN Expon Flow exponent
DRAIN Offset Offset height
DRAIN Delay Delay
DRAINMAT Thick Mat thickness
DRAINMAT VFrac Mat void fraction
DRAINMAT Mat roughness (Manning's n)
DRAIN OpenDepth Underdrain open depth
DRAIN CloseDepth Underdrain close depth
DRAIN ControlCurve Underdrain control curve See the Underdrain Curve import description for further information.
REMOVALS Underdrain pollutant removal SWMM5 Pollid is imported to the Pollutant column in the ICM Underdrain pollutant removal grid, and SWMM5 % Removal is imported to the Removal % column.

[LANDUSES]

The SWMM5 [LANDUSES] section is imported to a SWMM Land Use object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Land Use Data Field

Notes
Name Land use ID
SweepInterval Sweep interval
Availability Sweep availability
LastSweep Last swept

[WASHOFF]

The [WASHOFF] section is imported to a SWMM Land Use object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Land Use Data Field

Notes

Pollutant

Washoff

Values from the SWMM5 [BUILDUP] section are imported to the

ICM

Washoff grid as shown below:

SWMM5 Field

Washoff Column
Pollutant Pollutant
FuncType Washoff type
C1 Exponential washoff coefficient
C1 Rating washoff coefficient
C1 EMC washoff coefficient
C2 Washoff exponent
SweepRmvl Cleaning efficiency
BmpRmvl BMP removal efficiency

FuncType

C1

C1

C1

C2

SweepRmvl

BmpRmvl

[BUILDUP]

The [BUILDUP] section is imported to a SWMM Land Use object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Land Use Data Field

Notes

Pollutant

Build-up

Values from the SWMM5 [BUILDUP] section are imported to the

ICM

Washoff grid as shown below:

SWMM5 Field

Washoff Column
Pollutant Pollutant
FuncType Buildup type
C1 Max. build-up
C2 Exponential rate constant
C2 Power rate constant
C3 Power time exponent
C3 Half saturation constant
PerUnit Unit

FuncType

C1

C2

C2

C3

C3

PerUnit

[POLLUTANTS]

The SWMM5 [POLLUTANTS] section is imported to a SWMM Pollutant object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Pollutant Data Field

Notes
Name Name
Units Units
Crain Rainfall concentration
Cgw Groundwater concentration
Cii I&I concentration
Kd Decay coefficient
Sflag Snow only
CoPoll Co-pollutant
CoFract Co-fraction
Cdwf DWF concentration
Cinit Initial concentration

[SNOWPACKS]

The SWMM5 [SNOWPACKS] section is imported to a SWMM Snow Pack object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Snow Pack Data Field

Notes
PLOWABLE SNN0 Fraction of impervious area ploughable
Name Snow pack ID
IMPERVIOUS SD100 Impervious depth at 100% cover
IMPERVIOUS Tbase Impervious base temperature
IMPERVIOUS FWF Impervious fraction free water capacity
IMPERVIOUS FW0 Impervious initial free water
IMPERVIOUS Cmax Impervious max. melt coefficient
IMPERVIOUS Cmin Impervious min. melt coefficient
IMPERVIOUS SD0 Impervious initial snow depth
REMOVAL Fout Fraction transferred out of the catchment
PERVIOUS SD100 Pervious depth at 100% cover
PERVIOUS Tbase Pervious base temperature
PERVIOUS FWF Pervious fraction free water capacity
PERVIOUS FW0 Pervious initial free water
PERVIOUS Cmax Pervious max. melt coefficient
PERVIOUS Cmin Pervious min. melt coefficient
PERVIOUS SD0 Pervious initial snow depth
PLOWABLE Tbase Plowable base temperature
REMOVAL Dplow Depth at which snow removal begins
PLOWABLE FWF Plowable fraction free water capacity
PLOWABLE FW0 Plowable initial free water
PLOWABLE Cmax Plowable max. melt coefficient
PLOWABLE Cmin Plowable min. melt coefficient
PLOWABLE SD0 Plowable initial snow depth
PLOWABLE Scatch Subcatchment ID
PLOWABLE Fimelt Fraction converted into immediate melt
PLOWABLE Fimp Fraction transferred to the impervious area
PLOWABLE Fperv Fraction transferred to the pervious area
PLOWABLE Fsub Fraction moved to another subcatchment

[AQUIFERS]

The [AQUIFERS] section is imported to a SWMM Aquaifer network object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Aquifer Data Field

Notes
Name Aquifer ID
Por Soil porosity
WP Soil wilting point
FC Soil field capacity
Ks Conductivity
Kslp Conductivity slope
Tslp Tension slope
Etu Evapotranspiration fraction
Ets Evapotranspiration depth
Seep Seepage rate
Ebot Elevation
Egw Initial groundwater
Umc Initial moisture content
Epat Time pattern ID

[Innovyze_Supplementary_Infiltration]

Infiltration information from the [Innovyze_Supplementary_Infiltration] is imported into a SWMM network Subcatchment object in InfoWorks ICM.

SWMM5 Field

InfoWorks ICM Subcatchment Data Field /Grid

Notes
InfiltrationType Infiltration model
MaxInfilRate Initial infiltration Imported for Horton and Modified Horton types of infiltration
MinInfilRate Limiting infiltration Imported for Horton and Modified Horton types of infiltration
DecayConstant Decay factor Imported for Horton and Modified Horton types of infiltration
DryingTime Drying time Imported for Horton, Modified Horton and Curve number types of infiltration
Max_Volume Maximum infiltration volume Imported for Horton and Modified Horton types of infiltration
SuctionHead Average capillary suction Imported for Green Ampt and Modified Green Ampt types of infiltration
Conductivity Saturated hydraulic conductivity Imported for Green Ampt and Modified Green Ampt types of infiltration Although imported, it is not used in InfoWorks ICM as deprecated in SWMM5.
InitialDeficit Initial moisture deficit Imported for Green Ampt and Modified Green Ampt types of infiltration
MaxInfilRateCurve Curve number Imported for Curve number type of infiltration

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