An aquifer confined at the top and at the bottom by impermeable layers is stratified into three layers as follows:
| Layer |
Thickness (m) |
Permeability (m/day) |
| Top layer | 4 | 30 |
| Middle layer | 2 | 10 |
| Bottom layer | 6 | 20 |
The transmissivity (m2/day) of the aquifer is
1
260
2
227
3
80
4
23
5
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