The solution

has been constructed here

- by superimposing the surfce R[C, t] = 0 and eq. (8) R[C, t] (left side of figure), or
- 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

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Joachim Gruber