Building Construction
Raft foundations are used for:

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

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Building Construction
Depth or height of the arch is the

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

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