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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Building Construction
Raft foundations are used for:

Counter acting the hydrostatic effect
Providing increased area of foundation over poor bearing capacity of soil
All listed here
Spanning over small soft or loose pockets

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