Best way to design ditches

Hi, 

I have a problem with designing ditches which have own vertical alignments. When I create vertical alignment of ditch in point nr 2, the alignment is shorter then the axis of ditch - so when I project the slope for ex. 2% it will have on the ditch less then 2%.

When I create vertical alignment of ditch in point 3 and then displays profile with vertical alignment elevation of axis is different in cross section then in profile (difference is about +-1 cm) becasue the cross section is made in stationing of the axis of road, while the profile has own stationing which is a bit longer.

So what is the best way to desing a vertical alignment of a ditch?? How to do it in InRoads without little misteakes?? Is there a special tool to create vertical alignment of ditches?

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