### How to Determine Depth of Foundation? - The

In the Rankine's formula, it can be seen that foundation depth depends on the bearing capacity of soil, so, if the bearing capacity of soil increases, the depth of foundation also increases. Foundation Depth Calculation. Gross bearing capacity of soil = 300 kN/m 2. Density of Soil = 18 kN/m 3. Angle of repose = 30 Degrees. Then minimum depth