Conduit Data Fields (SWMM)
Conduit data can be edited on either the Conduit Grid Window of the Links Grid or the Conduit Property Sheet.
To view and edit all conduit data, use the Property Sheet. this is just the same. it is not any better this is ref this is very slow
This table describes all the conduit specific data which can be used to define a conduit for a SWMM network. For details of results fields for conduits, see the Link Results Data Fields (SWMM) topic.
Common Data Fields Fields that are common to the majority of objects can be found in the Common Fields topic.
Conduit Data
Database Table Name: sw_conduit
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Show Columns |
Database Names |
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Size, Type and Units |
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Defaults and Error Limits |
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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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| Link ID |
A unique name or identifier for this conduit. This name cannot be used by any other network object on the Links grid. |
id | Text | 254 | 0 | ||||||
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Start node |
The name of the upstream node of the conduit. Any nodes already defined can be selected from the dropdown list. |
us_node_id |
Text |
254 |
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0 |
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End node |
The name of the downstream node of the conduit. Any nodes already defined can be selected from the dropdown list. |
ds_node_id |
Text |
254 |
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0 |
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| Branch ID |
Numeric field used to identify to which long section the link is associated. See Defining Branches topic for more information. |
branch_id | Long integer | 0 | 0 | 0 | |||||
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Length |
The length of the conduit. |
length |
Double |
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L |
3 |
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The shape of the conduit. The required shape can be selected from the dropdown list. Note that the Dummy option has no shape-related parameters such as height as it passes the inflow directly to the downstream node. |
shape |
Text |
16 |
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0 |
Circular |
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| Shape curve |
Displayed when the Shape field is set to Custom. The name of the curve which defines the shape of this conduit. Any shape curves already defined can be selected from the dropdown list.
Alternatively, a new one can be added or an existing one modified using the |
shape_curve | Text | 254 | 0 | ||||||
| Transect |
Displayed when the Shape field is set to Irregular. The name of the transectwhich defines the shape of this conduit. Any transects already defined can be selected from the dropdown list.
Alternatively, a new one can be added or an existing one modified using the |
transect | Text | 254 | 0 | ||||||
| Vertical ellipse size code |
Displayed when the Shape field is set to Vert_ellipse. A code which represents the maximum width x full depth of a vertical elliptical shaped conduit. The required code can be selected from the dropdown list or set to Custom. If the Custom option is selected, the Conduit height and Conduit width fields are enabled, allowing you to specify those conduit dimensions. |
vert_ellipse_size_code | Text | 4 | 0 | ||||||
| Horizontal ellipse size code |
Displayed when the Shape field is set to Horz_ellipse. A code which represents the full depth x maximum width of a horizontal elliptical shaped conduit. The required code can be selected from the dropdown list or set to Custom. If the Custom option is selected, the Conduit height and Conduit width fields are enabled, allowing you to specify those conduit dimensions. |
horiz_ellipse_size_code | Text | 4 | 0 | ||||||
| Standard size material |
Displayed when the Shape field is set to Arch. The standard size material for an arch shaped conduit can be selected from a dropdown list or set to Custom. If the Custom option is selected, the Conduit height and Conduit width fields are enabled, allowing you to specify those conduit dimensions. |
arch_material | Text | 32 | 0 | ||||||
| Concrete size code |
Displayed when the Standard size material field is set to Concrete. A code which represents the rise x span of a concrete arch shaped conduit. The required code can be selected from the dropdown list. |
arch_concerte_size_code | Text | 4 | 0 | ||||||
| Steel 1/2 inch size code |
Displayed when the Standard size material field is set to Steel_1/2_corrugation. A code which represents the rise x span of a half inch steel arch shaped conduit. The required code can be selected from the dropdown list. |
arch_steel_half_size_code | Text | 4 | 0 | ||||||
| Steel inch size code |
Displayed when the Standard size material field is set to Steel_1_corrugation. A code which represents the rise x span of a one inch steel arch shaped conduit. The required code can be selected from the dropdown list. |
arch_steel_inch_size_code | Text | 4 | 0 | ||||||
| Plate 18 size code |
Displayed when the Standard size material field is set to Structural_plate_18_corner. A code which represents the rise x span of an arch shaped conduit with an 18"corner radius structural plate. The required code can be selected from the dropdown list. |
arch_plate_18_size_code | Text | 4 | 0 | ||||||
| Plate 31 size code |
Displayed when the Standard size material field is set to Structural_plate_31_corner. A code which represents the rise x span of an arch shaped conduit with an 31"corner radius structural plate. The required code can be selected from the dropdown list. |
arch_plate_31_size_code | Text | 4 | 0 | ||||||
| Conduit height |
The full height of a conduit. This field is not displayed when the Shape field is set to Irregular. |
conduit_height | Double | PS | 3 | 0 | |||||
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Conduit width |
Displayed when the Shape field is set to Rect_closed, Rect_open, Trapezoidal, Triangular, Parabolic, Power, Rect_triangular, Rect_round, or ModBasketHandle. Enabled when the Shape field is set to Horz_ellipse, Vert_ellipse or Arch and the Horizontal ellipse size code, the Vertical ellipse size code or the Standard size material field is set to Custom. Width value used to calculate the cross sectional geometry of the conduit. For trapezoidal and modified basket shaped conduits, this is the base width. For all rectangular (open, closed, triangular, and round) shaped conduits, and parabolic and power shaped conduits, this is the width at the top of the channel lining, or at the maximum design water level. For horizontal and vertical elliptical shaped conduits, and arch shaped conduits, this is the maximum width. |
conduit_width |
Double |
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L |
0 |
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1 |
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| Number of barrels | The number of barrels, ie, identical, parallel conduits, that exist between the specified US node ID and DS node ID. Default is 1 (ie, a single conduit). | number_of_barrels | Long integer | 0 | 1 | 1 | |||||
| Roughness D-W |
Displayed when the Shape field is set to Force_main, and the Force main equation field is set to D-W (Darcy-Weisbach) in the Model Parameters Options. The roughness value to be used for the Darcy-Weisbach version of the force main equation. |
roughness_DW | Double | RCW | 4 | 0 | |||||
| Roughness H-W |
Displayed when the Shape field is set to Force_main, and the Force main equation field is set to H-W (Hazen-Williams) in the Model Parameters Options. The roughness value to be used for the Hazen-Williams version of the force main equation. |
roughness_HW | Double | 0 | 0 | ||||||
| Shape exponent |
Displayed when the Shape field is set to Power. The exponent for a power shaped conduit. |
shape_exponent | Double | 2 | 0 | ||||||
| Triangular height |
Displayed when the Shape field is set to Rect_triangular. The height of the triangular part of a conduit, i.e. from the bottom of the rectangular part to the apex of the triangular part of the conduit. |
triangle_height | Double | L | 0 | 0 | |||||
| Bottom radius |
Displayed when the Shape field is set to Rect_round. The radius at the bottom of a rectangular round shaped conduit. |
bottom_radius | Double | L | 0 | 0 | |||||
| Top radius |
Displayed when the Shape field is set to ModBaskethandle. The radius at the top of a modified basket handle shaped conduit. |
top_radius | Double | L | 0 | 0 | |||||
| Left slope |
Displayed when the Shape field is set to Trapezoidal. The slope on the left side of a trapezoidal shaped conduit. |
left_slope | Double | S | 0 | 0 | |||||
| Right slope |
Displayed when the Shape field is set to Trapezoidal. The slope on the right side of a trapezoidal shaped conduit. |
right_slope | Double | S | 0 | 0 | |||||
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The invert level for the upstream end of the conduit, measured above system datum. There is no restriction on whether the upstream or downstream invert level is higher. If the default data flag (#D) is set, this field is set to the value specified for the Invert elevation of the upstream node that this conduit is connected to. |
us_invert |
Double |
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Z |
3 |
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| Downstream elevation |
The invert level for the downstream end of the conduit, measured above system datum. There is no restriction on whether the upstream or downstream invert level is higher. If the default data flag (#D) is set, this field is set to the value specified for the Invert elevation of the downstream node that this conduit is connected to. |
ds_invert | Double | Z | 3 | ||||||
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US headloss coefficient |
A multiplying factor which represents energy losses at the entry to the conduit. Typical values for culverts can be found in the SWMM5 User Manual. |
us_headloss_coeff |
Double |
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3 |
0 |
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| DS headloss coefficient |
A multiplying factor which represents energy losses at the end of the conduit. For culverts, a value of 1 is recommended in the SWMM5 User Manual. |
ds_headloss_coeff |
Double |
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3 |
0 | ||||
| Manning's N |
Manning's roughness coefficient that applies to the conduit. If a Depth threshold is specified, then for all conduits, except conduits whose Shape is set to Irregular, Force_main or Dummy, this Manning's N value will only apply to the conduit when the flow is equal to or exceeds the Depth threshold. Typical Manning's N values for closed conduits and open channels can be found in the SWMM5 User Manual. |
Mannings_N | Double | 3 | 0.01 | 0.001 | 0.5 | ||||
| Low depth Manning's N |
Manning's roughness coefficient that applies to the conduit when the flow is below the Depth threshold. Displayed when the Shape field is set to any option except Irregular, Force_main or Dummy. |
bottom_mannings_N | Double | 3 | 0.01 | 0.001 | 0.5 | ||||
| Depth threshold |
The depth that determines which of the Manning's roughness coefficient (Low depth Manning's N or Manning's N) is to be used. When the flow is equal or greater than the depth threshold, the roughness Manning's N coefficient will be used for the entire conduit. When flow is less than the depth threshold, the Low depth Manning's N coefficient is used for the entire conduit. Displayed when the Shape field is set to any option except Irregular, Force_main or Dummy. |
roughness_depth_threshold | Double | PS | 3 | 0 | 0 | ||||
| Initial flow | Flow in conduit at the start of the simulation. | initial_flow | Double | Q | 3 | ||||||
| Maximum flow |
Maximum allowable flow in the conduit. |
max_flow | Double | Q | 3 | 0 | |||||
| Sediment depth |
Displayed when the Shape field is set to Filled_Circular The depth of any sediment at the bottom of the conduit. |
sediment_depth | Double | PS | 0 | 0 | |||||
| Average headloss coefficient | A multiplying factor which represents the average energy losses along the length of the conduit. | av_headloss_coeff | Double | 3 | 0 | ||||||
| Seepage rate |
A constant rate of exfiltration of water along the length of the conduit. Note that this only accounts for seepage losses and not the infiltration of rainfall dependent groundwater. However, this can be modelled using Rainfall dependent I/I simulation option. |
seepage_rate | Double | I | 3 | 0 | |||||
| Flap valve | A check in the box indicates that this conduit contains a flap valve (which prevents backflow through the conduit). Unchecked by default. | flap_gate | Boolean | 0 | False | ||||||
| Culvert code |
The code that describes a culvert can be selected from the dropdown list. |
culvert_code | Text | 4 | 0 |
button located to the left of the field. This displays the 