SUDS Control Data Fields (InfoWorks)

New SUDS control data in InfoWorks networks is added to database in either the SUDS Control tab of the Subcatchments Grid or by clicking on the button adjacent to the SUDS controls field in the SUDS/LIDs section of the subcatchment Property Sheet.

The data can, however, only be modified or deleted from the SUDS controltab in the Subcatchments Grid.

Once defined, a SUDS control object can be associated a SUDS controls structure in a subcatchment.

The following table describes the all data fields which are used to define a SUDS control object.

Common Data Fields

Fields that are common to the majority of objects can be found in the Common Fields topic.

SUDS Control Data

Database Table Name: hw_suds_control

Show Columns

Database Names

Size, Type and Units

Defaults and Error Limits

Field Name

Help Text

Database Field

Data Type





Error Lower Limit

Error Upper Limit

Warning Lower Limit

Warning Upper Limit

Control ID The name that identifies this control object.











Control type The type of SUDS/LID control can be selected from the dropdown list. control_type Text 25     Bio-retention cell    



Berm height

Storage height.

When confining walls or berms are present this is the maximum depth to which water can pond above the surface of the SUDS/LID structure before overflow occurs.

For SUDS/LIDs that experience overland flow, it is the height of any surface depression storage.

For swales, it is the height of the trapezoidal cross section, which must be greater than 0.001 mm.

surf_berm_height Double   PS 3 0    



Storage depth Storage depth. surf_storage_depth Double   PS 3 0    



Vegetation volume fraction Fraction of the area above the surface that is filled with vegetation. surf_veg_vol_fraction Double     3 0    



Surface roughness (Manning’s n) Manning’s n for overland flow. This surface roughness cannot be 0 for permeable pavements, green roofs or vegetative swales. surf_roughness_n Double     3 0.1    



Surface slope The gradient of the surface slope. surf_slope Double   S 3 0.01    



Swale side slope (run/rise) The run/rise (inverse slope) of side walls. surf_xslope Double     3 0.05    



Pavement thickness The thickness of the pavement layer. pave_thickness Double   PS 3 100    



Pavement void ratio The void ratio of the pavement layer. pave_void_ratio Double     3 0.15    



Impervious surface fraction Ratio of impervious paver material to total area. pave_impervious_surf_fraction Double     3 0    



Permeability Permeability of the concrete or asphalt used in continuous systems or hydraulic conductivity of the fill material (gravel or sand) used in modular systems. pave_permeability Double   I 3 100    



Pavement clogging factor Number of pavement layer void volumes of runoff treated it takes to completely clog the pavement. pave_clogging_factor Double     3 0    



Regeneration interval

The number of days that the pavement layer is allowed to clog before its permeability is restored, usually by vacuuming its surface.

pave_regen_interval Double   TD 3 0 0      
Regeneration fraction

The fractional degree to which the pavement's permeability is restored when a Regeneration interval is reached. A value of 0 (default) indicates no regeneration, while a value of 1 indicates complete restoration to the original permeability. Once a regeneration occurs, the pavement begins to clog once again at the rate set in the Pavement clogging factor.

pave_regen_fraction Double     3 0 0      
Soil class The class of soil can be selected from a drop-down list. soil_class Text 20          



Soil thickness Thickness of layer. soil_thickness Double   PS 3 500    



Soil porosity Porosity of the soil. This field is automatically populated when the Soil class is selected. soil_porosity Double     3 0.5    



Field capacity Soil field capacity. This field is automatically populated when the Soil class is selected. soil_field_capacity Double     3 0.2    



Wilting point Soil wilting point. This field is automatically populated when the Soil class is selected. soil_wilting_point Double     3 0.1    



Conductivity Soil’s saturated hydraulic conductivity. This field is automatically populated when the Soil class is selected. soil_conductivity Double   I 3 12.7    



Conductivity slope Slope of the curve of log (conductivity) versus soil moisture content. soil_conductivity_slope Double     3 10    



Suction head Soil capillary suction. This field is automatically populated when the soil Class is selected. soil_suction_head Double   PS 3 88.9    



Barrel height

Height of a rain barrel. storage_barrel_height Double   PS 3 0    



Storage thickness Thickness of the storage layer. storage_thickness Double   PS 3 150    



Storage void ratio The storage void ratio. storage_void_ratio Double     3 0.75    



Seepage rate The filtration rate of the layer when first constructed. storage_seepage_rate Double   I 3 10    



Storage clogging factor Number of storage layer void volumes of runoff treated it takes to completely clog the layer. storage_clogging_factor Double     3 0    



Coefficient for flow in mm/hr

Coefficient C that determines the rate of flow through the underdrain as a function of height of stored water above the drain bottom.

If the layer has no drain then set Coefficient for flow in mm/hr to 0.


The discharge coefficient in ICM can only be specified in metric (native) units, regardless of what type of unit has been set as the default display unit.

underdrain_flow_coefficient Double     3






Flow exponent Exponent n that determines the rate of flow through the underdrain as a function of height of stored water above the drain outlet. underdrain_flow_exponent Double     3






Offset height Height of underdrain piping or outlet above the bottom of the storage layer or rain barrel. underdrain_offset_height Double   PS 3






Delay The number of dry weather hours that must elapse before the drain line in a rain barrel is opened. underdrain_delay Double   Hours 3 6





Flow capacity

The flow capacity of the roof drain for a rooftop disconnection.

This is the maximum flow rate that the roof's drainage system, including gutters and downpipes, can handle before overflowing occurs. Use 0 if not applicable.

underdrain_flow_capacity Double     4 6





Mat thickness The thickness of the drainage mat layer. drainagemat_thickness Double   PS 3






Mat void fraction The void fraction of the drainage mat. drainagemat_void_fraction Double     3






Mat roughness (Manning’s n) Roughness of the drainage mat. drainagemat_roughness Double     3






SUDS/LID Controls

SUDS/LID Control Types

Subcatchment Data Fields (InfoWorks)

Sustainable Urban Drainage Systems

Subcatchments Grid

Property Sheets