Nodes of different colours represent the following:
Solid arrows point from a submodule to the (sub)module which it is
descended from. Dashed arrows point from a module or program unit to
modules which it uses.
Where possible, edges connecting nodes are
given different colours to make them easier to distinguish in
large graphs.
!! DUMMY OBJ FOR CARBON
!! check for specfic days
!! zero out microb accumalated for each hru
!! zero out tot
!! zero out totc
!! Carbon
!! tot accumulated microb for layer
!! Carbon w microb accumulated