For OptiSurface Designs with manually designed drain or ditches using breaklines, we typically also create a second machine control file which we typically name FieldName_Vxx_DrainFloor. This file has the floor of the drain much wider than required. Do a final pass down the center of each drain channel using the drain floor control file to ensure it will drain well.
Graeme Cox, OptiSurface Co-Founder, discuss the purpose of this extra machine control file and how to use it.