Determine the effective grain sizes and uniformly coefficients of the sediment graphed in Figure 1.

Grain-size distribution curves of fine sand.

100 Percent finer by weight 90 80 70 60 50 40 U.S. Standard Sieve openings in inches V 30 20 10 32 0 100 50 Gravel Coarse 10 5 Fine Coarse U.S. Standard Sieve numbers 1 0.5 Grain size (mm) Sand Medium Fine 0.1 0.05 Hydrometer 0.01 0.005 Silt or Clay 0 10 20 30 40 50 80 90 100 0.001 Percent coarser by weight