Soil Grain-Size Distribution

The different of soil grain size distribution curves are shown below, as it is obtained from coarse and fine grained portions of soil,now can be combined to each together to form one complete  soil grain-size distribution curve (also known as grading of curve). A typical grading curve is shown here.

From the complete soil grain-size distribution curve, the useful information can also be obtained such as:

1. Grading characteristics, which indicate the uniformity level and range in grain-size distribution.

2. Percentages (or fractions)different type of soil like gravel, sand, silt and clay-size.