Building Construction
Raft foundations are used for:

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

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Building Construction
Depth or height of the arch is the

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

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