Unify non dimensionalization constants (?)

[rb004f]

@kaarthiksundar It looks like we have a lot of non dimensionalization constants for units in the same dimension. For example, base_head, base_length, base_diameter, and base_elevation are all in m. If these have different non-dimensionalization constants do we run into potential bugs down the road where things could get out of whack? Would it make sense to have one constant per unit? Just a thought...

[kaarthiksundar]

@rb004f It makes sense to just have one.