I do not know if this is already available but I had a thought. I think it would cool and easier for my clients to see where their sewer is going if I could animate the line I have drawn in. If it could look like water flowing in the direction the line was drawn. Then if it could factor in the slope and elevations to calculate speed and automatically adjust itself, that would be amazing. I imagine the set up for something like that would consist of a dialog box that the user has to type in the slope of the line, starting and ending elevations, and directions. This would make it much easier for my clients to understand what they are looking at.