By definition the solution
of R[C, t] = 0 gives the function C = MIC[t].
has been constructed here
by superimposing the surfce R[C, t]
= 0 and eq. (8) R[C, t] (left side of figure),
by plotting the contour line R[C, t]
= 0 of the eq.(8) surface R[C, t] (right side of figure).
Left side of figure: The valley
R[C, t] has been filled with water up to the level R[C, t] = 0 with water.
Right side of figure: By
definition, the shoreline of the lake on the left side is the graph for
the function MIC[t].
version: 14. Jan. 2004