A foundation is considered as shallow if its depth is ________.
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Answer: D
A foundation is shallow if its depth is equal to or less than its width.
By Terzaghi's definition, a foundation is shallow when its depth below ground (D) does not exceed its width (B), that is D/B ≤ 1. Isolated footings, combined footings and rafts are usually shallow.
A depth greater than the width marks a deep foundation such as a pile or well. Fixed limits of 1 m are not the definition, since the classification depends on the ratio of depth to width, not on depth alone.
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