How long does the earthworks last? Do I need to come back to the field and redo the earthworks?
There maybe some settlement and expansion over time particularly in fill areas of the field. Our experience is that it's often a good idea to 're-trim' or regrade the field after 5 years but the earthworks required are much smaller than the original earthworks.
You can still use the original machine control file if you wish. However, farmers often re-survey and recalculate the earthworks and create a new machine control file.
The re-survey can also be used for the drainage analysis to check if the re-trim is required.
A new feature we'll have in OSDv2.6 where you can exaggerate the cut and fill areas using Tools > Cut/Fill > Exaggerate Cut/Fill to reduce the problem of settlement and expansion of the fill.