SWMM5 Conversion - Subcatchments
Information from the following sections of the SWMM5 project file are imported to InfoWorks ICM Subcatchment objects in InfoWorks networks:
- [SUBCATCHMENTS]
- [POLYGONS]
- [SUBAREAS]
- [INFILTRATION]
- [HYDROGRAPHS]
- [RDII]
- [LID_CONTROLS]
- [LID_USAGE]
- [LANDUSES]
- [BUILDUP]
- [WASHOFF]
[SUBCATCHMENTS] Section
SWMM5 [SUBCATCHMENTS] are imported as InfoWorks ICM Subcatchments.
Geometry of the subcatchment boundary is determined from the X and Y coordinate data in the [POLYGONS] section of the SWMM5 project file.
Each subcatchment has three surfaces to represent it:
- Impervious surface with depression storage
- Impervious surface with no depression storage
- Pervious surface
|
SWMM5 |
Description |
InfoWorks ICM Data Field |
|---|---|---|
|
Name |
Subcatchment ID |
Subcatchment ID |
|
Rgage |
Name of rain gauge assigned to subcatchment. Raingauge is defined in [RAINGAGES] section |
Rainfall Profile |
|
OutID |
Name of node or subcatchment that receives runoff from subcatchment |
Node ID In SWMM5 the Out ID may be a subcatchment. This is not supported in InfoWorks ICM. If a node with name OutID cannot be found, OutID will be imported to User Text 2 and a warning will be added to the log. |
|
Area |
Area of subcatchment |
Total Area |
|
%Imperv |
Percent impervious area of subcatchment |
Used to calculate Runoff Area Percentages. See Subcatchment Surface Areas below. |
|
Width |
Characteristic width of subcatchment |
Dimension |
|
Slope |
Subcatchment Slope (percent) |
Slope (%) |
|
Clength |
Total Curb Length |
User Number 1 (No InfoWorks ICM equivalent) |
|
Spack |
Name of snow pack object associated with the subcatchment. Snow pack object is defined in the [SNOWPACKS] section |
User Text 3 (Not currently supported) |
Subcatchment Surface Areas
Each subcatchment is represented by three surfaces. The areas of these surfaces are calculated as follows:
|
|
Where: %Imperv= Percentage of impervious area ([SUBCATCHMENTS] section) %Zero = Percentage of impervious area that has no depression storage ([SUBAREAS] section) |
Runoff Surfaces
Data from the SWMM5 [SUBAREAS] and [INFILTRATION] sections is imported into the InfoWorks ICM Runoff Surfaces.
The importer creates a Runoff Surface for each unique set of runoff characteristics. A Land Use is created for each unique set of runoff surfaces.
All surfaces use Routing Model type SWMM.
Impervious surfaces use Runoff Volume Type Fixed with Fixed Runoff Coefficient of 1.0.
[SUBAREAS] Section
|
SWMM5 |
Description |
InfoWorks ICM Data Field |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Subcat |
Subcatchment Name |
Used to determine to which Subcatchments the Runoff Surface applies. | ||||||||
|
Nimp |
Manning's n for overland flow over the impervious sub-area |
Runoff Routing Value (Surface Type = Impervious Runoff Volume Type = Abs) |
||||||||
|
Nperv |
Manning's n for overland flow over the pervious sub-area |
Runoff Routing Value (Surface Type = Pervious Runoff Volume Type = Abs) |
||||||||
|
Simp |
Depression storage for impervious sub-area |
Initial Loss Value (Surface Type = Impervious Initial Loss Type = Abs) |
||||||||
|
Sperv |
Depression storage for pervious sub-area |
Initial Loss Value (Surface Type = Pervious Initial Loss Type = Abs) |
||||||||
|
%Zero |
Percent of impervious area with no depression storage |
Used to calculate Runoff Area Percentages See Subcatchment Surface Areas above. | ||||||||
|
RouteTo |
|
Routing to OUTLET only supported. If the routing is to IMPERVIOUS or PERVIOUS a warning message will be added to the import log. |
||||||||
|
%Rted |
Percent of runoff routed from one type of area to another |
[INFILTRATION] Section
The SWMM5 Subcat field in the [INFILTRATION] Section is used to determine to which Subcatchments (and Runoff Surfaces) the Infiltration data is applied.
The Infiltration model used (and therefore which fields are defined) is defined in the SWMM5 [OPTIONS] section.
Horton Infiltration
|
SWMM5 |
Description |
InfoWorks ICM Data Field |
|---|---|---|
|
MaxRate |
Maximum infiltration rate on Horton curve |
Initial infiltration |
|
MinRate |
Minimum infiltration rate on Horton curve |
Limiting infiltration |
|
Decay |
Decay rate constant of Horton curve |
Decay factor |
|
DryTime |
Time it takes for fully saturated soil to dry |
Horton Drying Time |
|
MaxInf |
Maximum infiltration volume possible |
Horton Max Infiltration Volume |
Green-Ampt Infiltration
|
SWMM5 |
Description |
InfoWorks ICM Data Field |
|---|---|---|
|
Suction |
Soil capillary suction |
Green Ampt Suction |
|
Conduct |
Soil saturated hydraulic conductivity |
Green Ampt Conductivity |
|
InitDef |
Initial soil moisture deficit (volume of voids / total volume) |
Green Ampt Deficit |
Curve Number Infiltration
|
SWMM5 |
Description |
InfoWorks ICM Data Field |
|---|---|---|
|
CurveNo |
SCS Curve Number |
Curve number field of Subcatchment objects |
|
Conduct |
Soil saturated hydraulic conductivity |
Not imported (No InfoWorks ICM equivalent) |
|
DryTime |
Time it takes for fully saturated soil to dry |
Drying time field of Subcatchment objects |
Unit Hydrograph Data
Unit Hydrograph data is provided in the [RDII] and [HYDROGRAPHS] Sections of the SWMM5 input file.
[RDII] Section
Data in the [RDII] Section of the SWMM5 file is imported into InfoWorks ICM Subcatchment objects.
|
SWMM5 |
Description |
InfoWorks ICM Data Field |
|---|---|---|
|
Node |
Node name |
Used to identify the Subcatchment to which the node drains. If the node does not have a subcatchment, a dummy subcatchment will be created to allow the hydrograph to function. |
|
UH Group |
Name of RDII unit hydrograph group specified in the [HYDROGRAPHS] section |
RTK Hydrograph field of Subcatchment to which node drains |
|
SewerArea |
area of the sewershed which contributes RDII to the node |
Contributing Area field of Subcatchment to which node drains |
[HYDROGRAPHS] Section
Data in the [HYDROGRAPHS] Section of the SWMM5 file is imported as InfoWorks ICM RTK Hydrographs.
|
SWMM5 |
Description |
InfoWorks ICM Data Field |
|---|---|---|
|
Name |
Unit hydrograph group name |
RTK Hydrograph ID |
|
Raingage |
Name of rain gage used by UH group |
Rainfall profile field of Subcatchment |
|
Month |
Month of the year |
Month. If specific months are specified for the unit hydrograph group in the SWMM file, a InfoWorks ICM separate Monthly RTK hydrograph will be created for each month. These will have the same name as the RTK Hydrograph ID but assigned to the appropriate month. |
|
R1, R2, R3 |
Response ratios for the short-term, intermediate-term, and long-term UH responses, respectively |
R1, R2, R3 |
|
T1, T2, T3 |
Time to peak (hours) for the short-term, intermediate-term, and long-term UH responses, respectively |
T1, T2, T3 |
|
K1, K2, K3 |
Recession limb ratios for short-term, intermediate-term, and long-term UH responses, respectively |
K1, K2, K3 |
| Dmax1, Dmax2, Dmax3 | Maximum initial abstraction depth available for short-term, intermediate-term, and long-term UH responses, respectively | Max depth - Short term, Max depth - Medium term, Max depth - Long term |
| Drec1, Drec2, Drec3 | Initial abstraction recovery rate available for short-term, intermediate-term, and long-term UH responses, respectively | Recovery rate- Short term, Recovery rate- Medium term, Recovery rate- Long term |
| D01, D02, D03 | Initial abstraction depth already filled at start of the simulation available for short-term, intermediate-term, and long-term UH responses, respectively | Starting depth - Short term, Starting depth - Medium term, Starting depth - Long term |
LIDS
LIDs data is imported from the [LID_CONTROLS] and [LID_USAGE] sections of the SWMM input file.
[LID_CONTROLS]
Data from the SWMM5 [LID_CONTROLS] section is imported as a SUDS Control object.
|
SWMM5 |
Description |
InfoWorks ICM Data Field |
|---|---|---|
| Name | Name of the LID | Control ID |
| Type | Type of LID | Control type |
| SURFACE StorHt | Storage height | Berm height |
| SURFACE VegFrac | Fraction of the area above the surface that is filled with vegetation | Vegetation volume fraction |
| SURFACE Rough | Manning’s n for overland flow | Surface roughness (Manning’s n) |
| SURFACE Slope | Slope | Surface slope |
| SURFACE Xslope | Slope of side walls | Swale side slope |
| PAVEMENT Thick | Thickness of the pavement layer | Pavement thickness |
| PAVEMENT Vratio | Void ratio | Pavement void ratio |
| PAVEMENT FracImp | Ratio of impervious paver material to total area | Impervious surface fraction |
| PAVEMENT Perm | Permeability of the concrete or asphalt used in continuous systems or hydraulic conductivity of the fill material (gravel or sand) used in modular systems | Permeability |
| PAVEMENT Vclog | Number of pavement layer void volumes of runoff treated it takes to completely clog the pavement. | Pavement clogging factor |
| PAVEMENT | Regeneration interval | Regeneration interval |
| % regenerated | Regeneration fraction | |
| SOIL Thick | Thickness of soil layer | Soil thickness |
| SOIL Por | Soil porosity | Soil porosity |
| SOIL FC | Soil field capacity | Field capacity |
| SOIL WP | Soil wilting point | Wilting point |
| SOIL Ksat | Soil’s saturated hydraulic conductivity | Conductivity |
| SOIL Kcoeff | Slope of the curve of log(conductivity) versus soil moisture content | Conductivity slope |
| SOIL Suct | Soil capillary suction | Suction head |
| STORAGE Height | Thickness of the storage layer or height of a rain barrel. Imported as two separate fields in ICM, both with the same value. |
Storage thickness Barrel height |
| STORAGE Vratio | Storage void ratio | Storage void ratio |
| STORAGE Filt | The filtration rate of the layer when first constructed | Seepage rate |
| STORAGE Vclog | Number of storage layer void volumes of runoff treated it takes to completely clog the layer | Storage clogging factor |
| DRAIN Coeff | Coefficient C that determines the rate of flow through the underdrain as a function of height of stored water above the drain bottom |
Coefficient for flow in mm/hr Flow capacity |
| DRAIN Expon | Exponent n that determines the rate of flow through the underdrain as a function of height of stored water above the drain outlet | Flow exponent |
| DRAIN Offset | Height of underdrain piping or outlet above the bottom of the storage layer or rain barrel | Offset height |
| DRAIN Delay | The number of dry weather hours that must elapse before the drain line in a rain barrel is opened | Delay |
| DRAINMAT Thick | Drainage mat layer thickness | Mat thickness |
| DRAINMAT VFrac | Drainage mat void fraction | Mat void fraction |
| DRAINMAT | Drainage mat roughness | Mat roughness (Manning’s n) |
[LID_USAGE]
Data from the SWMM5 [LID_USAGE] section is imported into the SUDS/LIDs control fields of a Subcatchment.
|
SWMM5 |
Description |
InfoWorks ICM Data Field |
|---|---|---|
| Subcat | The name of the subcatchment using the LID process | Subcatchment ID |
| LID | The name of an LID process | SUDS structure ID |
| Number | The number of replicate LID units deployed | Number of units |
| Area | The area of each replicate unit | Area |
| Width | The width of the outflow face of each identical LID unit | Unit surface width |
| InitSat | The percent to which the unit's soil layer or storage layer is initially filled with water | Initial saturation |
| FromImp | The percent of the impervious portion of the subcatchment's non-LID area whose runoff is treated by the LID units | Impervious area treated |
| ToPerv | 1 if the outflow from the LID is returned onto the subcatchment's pervious area rather than going to the subcatchment's outlet; 0 otherwise | Outflow to: 1 is mapped to PERVIOUS, otherwise set to OUTLET |
LANDUSES
Data from the SWMM5 [LANDUSES] section is imported into the Build-up/Washoff Land Use fields of a subcatchment.
|
SWMM5 |
Description |
InfoWorks ICM Data Field |
|---|---|---|
| SweepInterval | Days between street sweeping | Sweep interval |
| Availability | Fraction of pollutant build-up available for removal by street sweeping. | Sweep removal |
| LastSweep | Days since last sweeping at start of the simulation | User text 1 |
BUILDUP
Data from the SWMM5 [BUILDUP] section is imported into the Build-up/Washoff Land Use fields of a subcatchment.
|
SWMM5 |
Description |
InfoWorks ICM Data Field |
|---|---|---|
| Pollutant | The mapping of SWMM5 pollutants to ICM determinants | Determinants |
| FuncType | Type of build-up function | Build-up type |
| C1 | Build up parameter |
Max. build-up |
| C2 | Build up parameter |
Power rate constant - if Build-up type is set to POWER_BUILDUP (power) Exponential rate constant - if Build-up type is set to EXPON_BUILDUP(Exponential)) |
| C3 | Build up parameter |
Power time exponent - if Build-up type is set to POWER_BUILDUP (power) Half saturation constant - if Build-up type is set to SATUR_BUILDUP (Saturation) |
WASHOFF
Data from the SWMM5 [WASHOFF] section is imported into the Build-up/Washoff Land Use fields of a subcatchment.
|
SWMM5 |
Description |
InfoWorks ICM Data Field |
|---|---|---|
| Pollutant | The mapping of SWMM5 pollutants to ICM determinants | Determinants |
| FuncType | Type of washoff function | Washoff type |
| C1 | Washoff parameter |
Exponential washoff coefficient - if Washoff type is set to EXPON_WASHOFF(Exponential) Rating washoff coefficient - if Washoff type is set to RATING_WASHOFF (Rating Curve)) EMC washoff coefficient - if Washoff type is set to EMC_WASHOFF (Event mean concentration) |
| C2 | Washoff parameter | Washoff exponent - if Washoff type is set to EXPON_WASHOFF(Exponential) and RATING_WASHOFF (Rating Curve) |
| SweepRmvl | Street sweeping removal efficiency (percent) | Cleaning efficiency (%) |
| BmpRmvl | BMP removal efficiency (percent) | BMP removal efficiency (%) |
