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.
initialize orgaincs and minerals in water
initial organic mineral
initial pesticides
initial pathogens
initial heavy metals
initial salts
xwalk hydrology inputs
xwalk release decision table
xwalk with sediment inputs
xwalk with nutrient inputs