This tool,
, is used to draw lines or poly-lines in the the Main Window, representing the paths of overflows from pits and detention basins to downstream pits and nodes, or those going out of the system. It is also used to define flow paths or storage routing reaches in a RAFTS storage routing model.
When you click on this tool, the arrow cursor changes to a pencil. Click the point of the pencil cursor on the node or pit from which the overflow route originates. The route will appear as a dotted line when you move the pencil. The first time you select this tool in a session, there will be a message advising you to draw the route in segments using the usual left mouse button, and to complete it with a right-click on the receiving node.
Poly-lines are used to prevent overland flow paths between two nodes or pits coinciding with a pipe between the same components.