Table 1.

Lithological description of the borehole near the research area (blue circle in Fig. 2).

Explanations	Depth
Layer 1: Colluvium sediments - Unconsolidated materials: dry sand, gravel, silt and laterite - Sandy to silty clay	0–3 m 3–6 m
Layer 2: Moderately weathered bedrock - Consolidated materials (compact sand and gravel) - Grey clay and the groundwater can be observed	6–9 m 9–16 m
Layer 3: Bedrock - Sandstone	Under 16 m

m (meter).