In my mind, infield ditches (even shallow ones) are far from ideal. Their negatives include:
- require maintenance,
- reduce crop area,
- increase weeds,
- reduce machinery efficiency,
- increase machinery damage (see photo),
- etc.
However, if you really want them you can add them in OptiSurface Designer if required. This is typically done by adding 'valley' subzones to an OptiSurface 2D design or drawing in breaklines onto the proposed surface.
Originally posted by Graeme Cox, PhD of Precision Agriculture, BAE, Director of OptiSurface http://optisurface.ning.com/profiles/blogs/why-you-dont-want-ditches-in-your-field