Answer / subramani

it can be calculated by RANKINE'S formula
mini depth=q/gaama * square of [(1-sin pi)/(1+sin pi)]
where q=safe bearing capacity of soil
pi=angle of shearing resistence

Answer / sana

depth,d=(M/fck*Qr*b)^0.5
where M=moment
fck=compressive strength
b=breadth

Answer / mt

It depends on the code of practice your county specifies

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