Building Construction
Depth or height of the arch is the

Perpendicular distance between springing line and extrados
Vertical distance between springing line and intrados
None of these
Perpendicular distance between intrados and extrados

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Building Construction
Rotary drilling

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

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