Building Construction
The size of a floor tile commonly used, is

All listed here
15 cm × 15 cm × 1.8 cm
22.5 × 22.5 cm × 2.2 cm
20 cm × 20 cm × 2 cm

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Building Construction
Rotary drilling

Is not suitable for deposits containing very coarse gravel
All listed here
Hinders the ground water observations and permeability test
Is not economical for holes of less than 10 cm

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