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~ ~ ~ PURPOSE ~ ~ ~
this subroutine calculates lateral groundwater flow between adjacent cells
using Darcy's Law, then updates head and storage
(extracted from gwflow_simulate)
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.