Mastering AutoCAD® Civil 3D® 2012

Changing Flow Direction

Choosing a pipe network object and right-clicking opens the Pipe Networks contextual tab. To change flow direction, select Change Flow Direction from the Modify panel. Change Flow Direction allows you to reverse the pipe’s understanding of which direction it flows, which comes into play when you’re using the Apply Rules command and when you’re annotating flow direction with a pipe label-slope arrow.

Changing the flow direction of a pipe doesn’t make any changes to the pipe’s invert. By default, a pipe’s flow direction depends on how the pipe was drawn and how the Toggle Upslope/Downslope tool was set when the pipe was drawn:

• If the toggle was set to Downslope, the pipe flow direction is set to Start To End, which means ...