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## EMMA

$$\frac{Q_E}{Q_P} = \frac{c_P-c_F}{c_F-c_E}$$

E steht für Event und P für Pre-Event und F für Fluss (Mischung).

```{r cars} qp = 1 cp = -5.44 # permil, matrix cf = -6.33 # permil ground water, mixing ce = -7.91 # permil, event or macropore flow qe = qp*(cp-cf)/(cf-ce) s = qe+qp pqe = qe/s pqe ```