Introduction
Study area
The study area
Regional geology
Regional hydrogeology
Hydrogeological processes
Rock decomposition and expected geophysical signal
Materials and methods of data acquisition
Boreholes: ground control points
Field measurements and data analysis
Results and interpretation
Surface geology
Geological log
Material | Thickness (m) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Bm1 | Bm2 | Bm3 | Bm4 | Bm5 | Bm6 | Bm7 | Bm8 | Bm9 | Bm10 | Bm11 | |
Sand layer | 0 | 0 |
9
| 0 | 0 |
7
| 0 |
25
|
21
| 0 | 0 |
Weathered layer |
6
|
17
|
12
|
24
|
25
|
12
|
12
|
10
|
6
|
7
|
29
|
Semi-weathered layer |
31
|
25
|
9
|
9
|
12
|
9
|
8
|
15
|
7
|
28
|
16
|
Basement |
23
|
3
|
3
|
0
|
0
|
15
|
25
|
2
|
11
|
10
|
5
|
Total drilled depth | 60 | 45 | 33 | 33 | 37 | 43 | 45 | 52 | 45 | 45 | 50 |
Bottom elevation (masl) | 90 | 90 | 72 | 97 | 93 | 57 | 30 | 73 | 85 | 25 | 10 |
Ratio WL/SWL | 0.19 | 0.68 | 1.33 | 2.63 | 2.12 | 1.33 | 1.50 | 0.66 | 0.86 | 0.25 | 1.81 |
Yield (l/h) | – | 1200 | 1400 | 2800 | 800 | 1000 | 1500 | 800 | 1200 | – | 1100 |
Interpretation of geological and drill log
Surface geophysics
Normalized chargeability results
Water quality
Borehole | PH | Temp (°C) | Cond. (µS/cm) |
---|---|---|---|
Bm2 | 6.44 | 27 | 1444 |
Bm3 | 6.87 | 28.6 | 2600 |
Bm4 | 6.4 | 28.5 | 1278 |
Bm5 | 6.25 | 27.9 | 595 |
Bm6 | 6.62 | 25.8 | 2240 |
Bm7 | 6.84 | 27 | 382 |
Bm8 | 6.43 | 28.5 | 360 |
Bm9 | 6.41 | 28.5 | 2820 |
Bm11 | 5.97 | 30 | 470 |