The size distribution curves, as obtained from coarse and fine grained portions, can be combined to form one complete grain-size distribution curve (also known as grading curve). A typical grading curve is shown.
From the complete grain-size distribution curve, useful information can be obtained such as:
1. Grading characteristics, which indicate the uniformity and range in grain-size distribution.
2. Percentages (or fractions) of gravel, sand, silt and clay-size.