Building Construction
The depth of the ground water table may be ascertained by

Standing on the well in the vicinity
Measuring the depth of water in the well
None of these
Looking through the well in the vicinity

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Building Construction
Rotary drilling

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

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