New soil plasticity chart based on British Standard fall-cone flow index and liquid limit parameters: (a) chart for w_{L FC} < 120%; (b) chart for w_{L FC} < 600%. Note: data from Fig. 1 are shown on this plot to compare the classification systems, with those points indicated by solid black markers identifying soils that change classification category for implementation of the new plasticity chart. Equations (10) and (11) shown as revised A- and U-lines