LID Control Data Fields (SWMM)
New LID control data in SWMM networks is added to database in either the LID control
tab of the Subcatchments Grid or by clicking on the 
button adjacent to the LID controls field in the subcatchment Property Sheet.
The data can, however, only be modified or deleted from the LID control tab in the Subcatchments Grid.
Once defined, a LID control object can be associated with a LID controls structure in a subcatchment.
The following table describes the all data fields which are used to define a LID control object.
Common Data Fields Fields that are common to the majority of objects can be found in the Common Fields topic.
LID Control Data
Database Table Name: sw_suds_control
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Field Name |
Help Text |
Database Field |
Size |
Precision |
Default |
Error Lower Limit |
Error Upper Limit |
Warning Lower Limit |
Warning Upper Limit |
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| Control ID | The unique name that identifies this control object. |
control_id |
Text |
254 |
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| Control type | The type of LID control can be selected from the dropdown list. | control_type | Text | 25 | Bio-retention cell |
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| 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 LID structure before overflow occurs. For a LID 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. This field is not displayed when the Control type is set to Rain barrel or Rooftop disconnection. |
surf_berm_height | Double | PS | 3 | 0 | 0 |
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| Storage depth |
This field is displayed when the Control type is set to Rooftop disconnection. Storage depth. |
surf_storage_depth | Double | PS | 3 | 0 | 0 |
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| Vegetation volume fraction |
Fraction of the area above the surface that is filled with vegetation. This field is not displayed when the Control type is set to Rain barrel or Rooftop disconnection. |
surf_veg_vol_fraction | Double | 3 | 0 | 0 |
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| 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. This field is not displayed when the Control type is set to Rain barrel. |
surf_roughness_n | Double | 3 | 0.1 |
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| Surface slope |
The gradient of the surface slope. This field is not displayed when the Control type is set to Rain barrel. |
surf_slope | Double | S | 3 | 0.01 | 0 |
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| Swale side slope (run/rise) |
This field is displayed when the Control type is set to Vegetative swale. The run/rise (inverse slope) of side walls. |
surf_xslope | Double | 3 | 5 |
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| Pavement thickness |
This field is displayed when the Control type is set to Permeable pavement. The thickness of the pavement layer. |
pave_thickness | Double | PS | 3 | 100 | 0.001 |
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| Pavement void ratio |
This field is displayed when the Control type is set to Permeable pavement. The void ratio of the pavement layer. |
pave_void_ratio | Double | 3 | 0.15 | 0 |
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| Impervious surface fraction |
This field is displayed when the Control type is set to Permeable pavement. Ratio of impervious paver material to total area. |
pave_impervious_surf_fraction | Double | 3 | 0 | 0 |
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| Permeability |
This field is displayed when the Control type is set to Permeable pavement. 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 | 0 |
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| Pavement clogging factor |
This field is displayed when the Control type is set to Permeable pavement. Number of pavement layer void volumes of runoff treated it takes to completely clog the pavement. |
pave_clogging_factor | Double | 3 | 0 | 0 |
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| Regeneration interval |
This field is displayed when the Control type is set to Permeable pavement. 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 |
This field is displayed when the Control type is set to Permeable pavement. 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 |
This field is only displayed when the Control type is set to Bio-retention cell, Rain garden, Green roof or Permeable pavement. The class of soil can be selected from a drop-down list. |
soil_class | Text | 20 |
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| Soil thickness |
This field is only displayed when the Control type is set to Bio-retention cell, Rain garden, Green roof or Permeable pavement. Thickness of layer. |
soil_thickness | Double | PS | 3 | 0 |
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| Soil porosity |
Porosity of the soil. This field is automatically populated when the Soil class is selected. |
soil_porosity | Double | 3 | 0.5 | 0 |
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| Field capacity | Soil field capacity. This field is automatically populated when the Soil class is selected. | soil_field_capacity | Double | 3 | 0.2 | 0 |
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| Wilting point | Soil wilting point. This field is automatically populated when the Soil class is selected. | soil_wilting_point | Double | 3 | 0.1 | 0 |
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| Conductivity | Soil’s saturated hydraulic conductivity. This field is automatically populated when the Soil class is selected. | soil_conductivity | Double | I | 3 | 1.27 | 0 |
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| Conductivity slope |
This field is displayed when the Control type is set to Bio-retention cell, Rain garden, Green roof or Permeable pavement. Slope of the curve of log (conductivity) versus soil moisture content. |
soil_conductivity_slope | Double | 3 | 10 | 0 |
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| Suction head | Soil capillary suction. This field is automatically populated when the soil Class is selected. | soil_suction_head | Double | PS | 3 | 88.9 | 0 |
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Barrel height |
This field is only displayed when the Control type is set to Rain barrel. Height of a rain barrel. |
storage_barrel_height | Double | PS | 3 | 0 | 0 |
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| Storage thickness |
This field is displayed when the Control type is set to Bio-retention cell, Infiltration trench or Permeable pavement. Thickness of the storage layer. |
storage_thickness | Double | PS | 3 | 0 | 0.001 |
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| Storage void ratio |
This field is displayed when the Control type is set to Bio-retention cell, Infiltration trench or Permeable pavement. The storage void ratio. |
storage_void_ratio | Double | 3 | 0.75 |
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| Seepage rate |
This field is displayed when the Control type is set to Bio-retention cell, Rain garden, Infiltration trench or Permeable pavement. The filtration rate of the layer when first constructed. |
storage_seepage_rate | Double | I | 3 | 12.7 | 0 |
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| Storage clogging factor |
This field is displayed when the Control type is set to Bio-retention cell, Infiltration trench or Permeable pavement. Number of storage layer void volumes of runoff treated it takes to completely clog the layer. |
storage_clogging_factor | Double | 3 | 0 | 0 |
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| Coefficient for flow in flow units |
This field is displayed when the Control type is set to Bio-retention cell, Infiltration trench, Permeable pavement or Rain barrel. 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 flow units to 0. 
Warning
The discharge coefficient in ICM can only be specified in flow units, regardless of what type of unit has been set as the default display unit. |
underdrain_flow_coefficient | Double | 3 |
0 |
0 |
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| Flow exponent |
This field is displayed when the Control type is set to Bio-retention cell, Infiltration trench, Permeable pavement or Rain barrel. 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 |
0 |
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| Offset height |
This field is displayed when the Control type is set to Bio-retention cell, Infiltration trench, Permeable pavement or Rain barrel. Height of underdrain piping or outlet above the bottom of the storage layer or rain barrel. |
underdrain_offset_height | Double | PS | 3 |
152.4 |
0 |
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| Underdrain open depth |
This field is displayed when the Control type is set to Bio-retention cell, Infiltration trench, Permeable pavement or Rain barrel. The depth at which the underdrain part of the LID control is open. |
underdrain_open_depth | Double | Y | 3 | 0 | 0 | ||||||||||||||||||||||||||||||||||||||||||||
| Underdrain close depth |
This field is displayed when the Control type is set to Bio-retention cell, Infiltration trench, Permeable pavement or Rain barrel. The depth at which the underdrain part of the LID control is closed. |
underdrain_close_depth | Double | Y | 3 | 0 | 0 | ||||||||||||||||||||||||||||||||||||||||||||
| Underdrain control curve |
This field is displayed when the Control type is set to Bio-retention cell, Infiltration trench, Permeable pavement or Rain barrel. The name of the curve which defines the relationship between the depth and flow factors for this type of LID control. Any underdrain control curves already defined can be selected from the dropdown list.
Alternatively, a new one can be added or an existing one modified using the |
underdrain_control_curve | Text | 254 | 0 | ||||||||||||||||||||||||||||||||||||||||||||||
| Underdrain pollutant removal |
This field is displayed when the Control type is set to Bio-retention cell, Infiltration trench, Permeable pavement or Rain barrel. This field contains a series of records defining the removal of pollutants which apply to this type of LID control. These are entered on a grid which is displayed by clicking on the Database Table Name: sw_suds_poll_removal
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underdrain_poll_removal | Structure | ||||||||||||||||||||||||||||||||||||||||||||||||
| Delay |
This field is displayed when the Control type is set to Rain barrel. 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 |
0 |
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| Flow capacity |
This field is displayed when the Control type is set to Rooftop disconnection. The flow capacity of the roof drain. 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 | I | 4 | 0 |
0 |
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| Mat thickness |
This field is displayed when the Control type is set to Green roof. The thickness of the drainage mat layer. |
drainagemat_thickness | Double | PS | 3 |
76.200 |
0.001 |
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| Mat void fraction |
This field is displayed when the Control type is set to Green roof. The void fraction of the drainage mat. |
drainagemat_void_fraction | Double | 3 |
0.5 |
0 |
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| Mat roughness (Manning’s n) |
This field is displayed when the Control type is set to Green roof. Roughness of the drainage mat. |
drainagemat_roughness | Double | 3 |
0.1 |
0.001 |
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button.