How to estimate Sand Silt and Clay percentage according to USDA soil texture classification if Gravels are present in the soil ?

USDA textural triangle does not  include Gravel for textural classification. I have Hydrometer test data as well as Wet sieve analysis data (include Gravel %: Weight retained in 4.75 and 2 mm...

09 September 2017 2,198 8 View