@EireChch: The Hydrostatic profile would simply be 9.81*thickness, regardless of the porepressure value at the level (It could be negative indicating suction or positive indicating porewater pressure), the Hydrostatic profile states that the Total Head at this level is 0 i.e. at this level energy loss would not occur i.e. flow of pore liquid from a high potential to a lower potential. But at the groundwater table the pore-water pressure is assumed as zero (unsat. soil mechanics), that is why I was confused when my collegue was showing me piezometric results and geomil PCPT-Hydrostatic profile comparative results (the Geomil software will make the charts automatically for you)and where the Hydrostatic profile was intersecting the u2, at a similar thickness GWT was indicated, I just don't understand how it works that way.
@GeoEnvGuy: Thanks, i'll take the T50 fact to knowledge. Yes clay dissipation tests are tooo long.