---
title: "Stormwater Controls - SWC"
canonical: "https://help.innovyze.com/space/infodrainage2021v1/16548446/Stormwater%20Controls%20-%20SWC"
format: markdown
---
**Stormwater Controls (SWC)** often vary between projects, locations, and clients. Flexibility of design facilities is crucial. The flow routing through a SWC is described in [Analysis of Stormwater Controls](https://help-innovyze.atlassian.net/wiki/spaces/infodrainage2021v1/pages/16547861).

The list of the various types of SWC is shown below, with images of these systems for easy reference. 

> Macro (children)

Using [Object Templates](https://help-innovyze.atlassian.net/wiki/spaces/infodrainage2021v1/pages/16548067), any one of these [Stormwater Controls ](https://help-innovyze.atlassian.net/wiki/spaces/infodrainage2021v1/pages/16548446)types can be saved in order to use it elsewhere in the same design or in a completely different assessment.

<span style="color: #5f6062">SWC can be drawn graphically on the plan using three types of outlines; </span>**<span style="color: #5f6062">Circular</span>**<span style="color: #5f6062">, </span>**<span style="color: #5f6062">Rectangular</span>**<span style="color: #5f6062"> and </span>**<span style="color: #5f6062">Free form</span>**<span style="color: #5f6062">. </span><span style="color: #5f6062">A default outline is selected when the SWC is first added to the plan but these can be modified using the right-click menu.</span>

![image](media://e6adee4f-3b95-474f-9b9e-f87cbd85bed7)

<span style="color: #5f6062">The overall outline is the top area, where a SWC has sloping sides or a different base area – this will be shown with a dashed outline.</span>

![image](media://1ceac7df-de92-4a05-a753-f801d0705398)

A centre line is calculated for each outline type, which gives an indication of the direction of travel to allow a longitudinal slope to be applied but this can be modified <span style="color: #5f6062">using the right-click menu.</span> The centre line is calculated for each line type in the following way:

**Circular**

The last mouse click to indicate the size of the circle denotes the direction of travel from the centre. 

       For old files with a surface the highest cover level is determined around the outline perimeter and this is the start of the centre line. Without a surface the centreline is drawn from left to right through the centre.

**Rectangular**

From the centre of the rectangle from left to right, including for old files.

**Free form**

The longest distance between all the coordinates is determined and the direction of travel is either calculated from:

> Macro (legacy-content)

For old files the same rules apply when calculating the centre line.

If a SWC is added during an [Add train](https://help-innovyze.atlassian.net/wiki/spaces/infodrainage2021v1/pages/16547972) operation then the centre line direction is dictated by this operation and any changes to the outline will maintain this centre line, unless the outline is deleted.