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Table 7. Physical Properties of Sediment Grab Samples
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Figure 16. Variability between cumulative grain size distributions (weight vs. volume basis) for identical materials
ERDC TN-DOER-D2
September 2004
ASTM water content = ω = Ww/Ws
(1)
Wet (total) weight water content = w = Ww/W
(2)
Volumetric water content = θ = Vw/V
(3)
where Ww = weight of water, Ws = weight of dry solids, W= wet weight, Vw= volume of water,
and V= total volume.
To compare the differences in calculated values,
w% = 100(ω%) / (ω% + 100)
(4)
θ = e / 1+e where e = void ratio = ω Gs
(5)
Figure 15. Comparison of water content definitions
Grain size distributions based on volume instead of weight measurements will introduce
parameter variability when the two methods are compared. For example, Figure 16 shows grada-
tion curves for a sandy dredged material tested on both a weight basis and a volume basis. The
volume basis curve indicates a slightly coarser material, with a 0.1-mm difference in the median
particle sizes.
14

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