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Classification of Soil - Coggle Diagram

- - - - YES
        
        Plasticity is high
        Second letter is H
        Soil is fat clay or elastic silt
      - STEP 3
        Position of PI plots on plasticity chart?
        
        PI plots is above the A-line
        
        Fat clay,CH
    - - Soil is fine-grained
- - - - NO
        
        Soil is sand
        First letter is S
      - STEP 3
        Clay + silt fraction?
        
        < 5%
        
        STEP 4
        Uniformity coefficient, Cu and
        Uniformity curvature, Cc?
        
        Cu<6 and/or Cc<1 or Cc>3
        
        Cu = 4 while Cc = 0.735
        
        SP
        
        STEP 5
        Percentange of gravel?
        
        <15% gravel
        
        Poorly graded sand,SP
    - - Soil is coarse-grained.