# Solution Exercise 4

The freshwater head can be calculated using , which gives (noting that *z*_{i} = 100 − 60 = 40 m):

1. | |

The freshwater head is higher at piezometer 2 than at piezometer 1, so the flow is from piezometer 2 to 1. This is opposite to what one would conclude from uncorrected hydraulic head measurements.

2. The specific discharge follows from

which is a negative number because flow is in the direction of declining head.