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Group 3
Results of the measurements
AB/2 App res
1.5 201
2.25 186
3.75 79
4.5 58
6 30
7.5 21
15 11
22.5 15
30 16
37.5 22
45 28
60 38
75 53
• VES was done using
wenner method.
• Augering was also done
at two sites: Results-
Point A; 0-1.5m (course
sand), 1.5-1.9 m (clay)
and 1.9-2 m (fine sand).
Point B; 0-1 m (sand), 1-
1.5 m (sand and rocky
pieces).
• With wenner;
Subsurface composition interpretation
1 10 100 a
1
10
1e+2
1e+3
1e+4
Rho
VES 5 interpretation
Mto Segelei
VES (Wenner array)
layer1 241ohmm
(sand)
layer 2 8 ohmm
(clay)
layer 3 93,687 ohmm
(Rock)
Subsurface composition…
From wenner indicates
• 0-1.5 m probably sand (confirmed by auger).
• 1.5 – 5 m probably clay (confirmed by auger).
• 5 m – 25 m probably gravel or weathered
rocks.
• No sign of hard rock up-to 25 m depth.
Site not feasible for sand dam construction
since hard rock is deep.
How to use the tools
Hydrogeological profiling; to determine
gradient, river banks, rock outcrops, bends,
infiltration (silt)
VES; soil stratification, depth soil strata,
presence of aquifer
HES/profiling; soil strata homogeneity
Auger; soil strata in shallow depths
How to use the tools
Hydrogeological profiling; to determine
gradient, river banks, rock outcrops, bends,
infiltration (silt)
VES; soil stratification, depth soil strata,
presence of aquifer
HES/profiling; soil strata homogeneity
Auger; soil strata in shallow depths

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Knowledge Exchange mission SUSWA project 2014 - Case study group 3

  • 2. Results of the measurements AB/2 App res 1.5 201 2.25 186 3.75 79 4.5 58 6 30 7.5 21 15 11 22.5 15 30 16 37.5 22 45 28 60 38 75 53 • VES was done using wenner method. • Augering was also done at two sites: Results- Point A; 0-1.5m (course sand), 1.5-1.9 m (clay) and 1.9-2 m (fine sand). Point B; 0-1 m (sand), 1- 1.5 m (sand and rocky pieces). • With wenner;
  • 3. Subsurface composition interpretation 1 10 100 a 1 10 1e+2 1e+3 1e+4 Rho VES 5 interpretation Mto Segelei VES (Wenner array) layer1 241ohmm (sand) layer 2 8 ohmm (clay) layer 3 93,687 ohmm (Rock)
  • 4. Subsurface composition… From wenner indicates • 0-1.5 m probably sand (confirmed by auger). • 1.5 – 5 m probably clay (confirmed by auger). • 5 m – 25 m probably gravel or weathered rocks. • No sign of hard rock up-to 25 m depth. Site not feasible for sand dam construction since hard rock is deep.
  • 5. How to use the tools Hydrogeological profiling; to determine gradient, river banks, rock outcrops, bends, infiltration (silt) VES; soil stratification, depth soil strata, presence of aquifer HES/profiling; soil strata homogeneity Auger; soil strata in shallow depths
  • 6. How to use the tools Hydrogeological profiling; to determine gradient, river banks, rock outcrops, bends, infiltration (silt) VES; soil stratification, depth soil strata, presence of aquifer HES/profiling; soil strata homogeneity Auger; soil strata in shallow depths

Editor's Notes

  1. Key; Sand apparent resistivity is not more or is equal to 200 ohms Hard rock app res is more than 1000 ohms Clay app res is between 1-50 ohms