Building Construction
Rotary drilling

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

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Building Construction
During percussion drilling

All listed here
Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole
Caving or mixing of strata are caused in soft soils or cohesion-less soils
The soil to a considerable depth below the bottom of the hole gets disturbed

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