Autodesk Civil 3D® does not currently provide options for the representation of all of the data types that are required in a modern drainage design elements within its Pipe Networks functionality. As such we have had to implement our own representations of these that are created during the Import process, which are then maintained into the Export where possible.

Connections

The pipe network option does not support open sections, or the lesser used notional connection types, available in InfoDrainage. as such these are created as:

Connection TypeCivil 3D® Representation
Rectangular ChannelCorridor
Trapezoidal ChannelCorridor
Triangular ChannelCorridor
Open Custom ConnectionCorridor
No DelayPolyline
Lagged FlowPolyline

In addition to these connection types, InfoDrainage some additional options that are not supported within a Pipe Network:

No. of Barrels

An InfoDrainage connection with multiple barrels will be represented as multiple pipes (closed connections) or corridors (open connections) between the upstream and downstream structures. The software will attempt to spread the barrels out so that they are parallel to each other where ever possible, but if this cannot fit they will be overlapped.

Notes

If any of these pipes or corridors are moved or deleted in the Civil 3D® design they will not be included in the multi barrel connection exported. In the case of moving, the item will become a new single barrel connection in the exported InfoDrainage design

If the Pipe Network is edited within Civil 3D® the offset spacing of the elements will be snapped back to the centre of the structure, this is standard behaviour of their software. If the data is saved and reimported the values will be reset however.

Intermediate points

It is possible to added intermediate points to a connection within InfoDrainage to show it going around corners etc. This, like notional connections, tend to be used more for conceptual design rather than detailed. However if they are present in the pipe network we will consider them as follows

  • Standard sections - Pipes, Box Culverts, and other closed connections will be loaded as a series of short sections with null structures between them so that they are accurately represented in the Pipe Network.
  • Unsupported sections - As per the table above, will continue to be loaded in the same way with the intermediate points included.

Note

If any of these pipes are moved or deleted in the Civil 3D® design they will be considered as separate pipes in the exported InfoDrainage design

Junctions

The manhole data type is represented within a Civil 3D® Pipe Network, but the Simple Junction type is not directly comparable.

InfoDrainage TypeCivil 3D® Representation
Simple JunctionNull Structure

Stormwater Controls

Civil 3D® does not have any native support Stormwater Controls, as such the software has been designed to represent them as closely as possible in 3D space using a mesh to represent the volume they take up.

This is achieved using Features Lines that represent the levels of the structure with a mesh formed from these to show the space they take up on site. 

Note

Features lines are unable to be directly above one another, so where a shape is straight sided (i.e. Porous Paving or a pond with no side slope) the software will create the upper feature line slightly offset from the lower one.

Cellular Storage, Chamber, Infiltration Trench, Porous Paving and Soakaways

These Stormwater controls do not have a side slope and are represented in Civil 3D® as a pair of feature lines, one for the top and another for the base.

If either of these feature lines change, it will be used as the stormwater control outline in the export (the top area feature line is checked first). Changes to their levels will modify the exceedence and base levels of the stormwater control.

Ponds and Tanks

Each entry in the depth/area/volume table is represented as a feature line in Civil 3D®.

If these feature lines are modified, the depth and area are updated in the exported stormwater control. If the top area feature line has been modified, it will be used as the stormwater control outline in the export.

Bioretentions

Bioretentions have a feature line for the ponding area top and base and the storage layer base. 

If the top area feature line has been modified, it will be used as the stormwater control outline in the export. Changes to the ponding base or storage base feature lines will modify the area of the ponding area base. Ponding level changes will modify ponding levels and these changes combined with changes to the storage base level will be used to set the filtration layer depths.

Swales

Swales have a feature line for the ponding area top and base and for the trench base (if the trench is on). If the top area feature line has been modified, it will be used as the stormwater control outline in the export. Changes to the ponding base or trench base feature lines will modify the area of the ponding area base. Ponding level changes will modify ponding levels and these changes combined with changes to the trench base level will be used to set the trench depth.

Inlets and Outlets

A stormwater control's inlets and outlets are represented as null structures in Civil 3D®.

If a null structures has been moved, the corresponding inlet or outlet is moved to that location (unless the null structure was moved outside the outline of the SWC). If one of these null structures is deleted, on export the inlet or outlet will be created and positioned at the centre of the stormwater control to allow any connections that were connected to that inlet or outlet to connect to the stormwater control.