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.
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
Field Name 
Help Text 
Database Field 
Size 
Precision 
Default 
Error Lower Limit 
Error Upper Limit 
Warning Lower Limit 
Warning Upper Limit 


Control ID  The name that identifies this control object. 
control_id 
Text 
64 







Control type  The type of SUDS/LID control can be selected from the dropdown list.  control_type  Text  25  Bioretention 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 dropdown 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. Warning
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 
0 





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 
0.5 





Offset height  Height of underdrain piping or outlet above the bottom of the storage layer or rain barrel.  underdrain_offset_height  Double  PS  3 
150 





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 
75 





Mat void fraction  The void fraction of the drainage mat.  drainagemat_void_fraction  Double  3 
0.5 





Mat roughness (Manning’s n)  Roughness of the drainage mat.  drainagemat_roughness  Double  3 
0.1 



