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Re: Retaining wall design pressures

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> Saturated condition and submerged condition are two different
> scenarios.  In saturated case, there is just enough moisture in soil
> to fill all the voids.  Obviously, the unit weight of saturated soil
> would be greater than dry unit weight.  However, the moisture is not
> large enough to develop hydrostatic prssures. In this situation,
> pressure on wall is equal to (Coeff. of lateral earthpressure X
> saturated unit weight of soil X depth under consideration).
> In submerged situation, there is sufficient free water to develop
> hydrostatic pressure.  Therefore, the pressure on the wall will be
> due to two components:  Pressure due to submerged soil (use
> submerged unit weight and coeff. of lateral earthpressure) and
> hydrostatic pressure.
> Rajendran

What happens when you add one drop of water to the saturated 
soil? Does the pressure on the wall suddenly change or are the two 
conditions essentially the same?