The critical depth of vertical cut in a cohesive soil is given by
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qu=CNc+qNq+12ByNy
For cohensionless soil C = 0, Footing resting on sand surface so, Df = 0
When water level is at base of footing
qu1=12BysubNy
When water level is at much greater depth
qu2=12BytNy
Percentage reduction in bearing capacity
=qu2−qu1qu1×100=y1−ysubyt×100
As ysub≃0.5yt
So, percentage
For cohensionless soil C = 0, Footing resting on sand surface so, Df = 0
When water level is at base of footing
qu1=12BysubNy
When water level is at much greater depth
qu2=12BytNy
Percentage reduction in bearing capacity
=qu2−qu1qu1×100=y1−ysubyt×100
As ysub≃0.5yt
So, percentage
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