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compute unit hydrographs for all hru and ru
compute uh for all incoming hru and ru with fraction < 1
assume tc = sqrt(da_km) --> delta tc = sqrt(small_area)/sqrt(entire_area) = sqrt(frac_area)
Nodes of different colours represent the following:
Solid arrows point from a procedure to one which it calls. Dashed
arrows point from an interface to procedures which implement that interface.
This could include the module procedures in a generic interface or the
implementation in a submodule of an interface in a parent module.
Where possible, edges connecting nodes are
given different colours to make them easier to distinguish in
large graphs.