A GIS-Enabled Approach for Assessing Damage Potential of Levee Systems Based on Underlying Geology and River Morphology

Table 1

Coefficient of variation for common field measurements [4].

Test type	Property	Soil type	Mean	Units	COV (%)
	𝑞𝑇	Clay	0.5–2.5	MN/m^2	<20
CPT	𝑞𝑐	Clay	0.5–2	MN/m^2	20–40
	𝑞𝑐	Sand	0.5–30	MN/m^2	20–60
VST	𝑆𝑢	Clay	5–400	kN/m^2	10–40
SPT	𝑁	Clay and sand	10–70	blows/ft	25–50
	A reading	Clay	100–450	kN/m^2	10–35
	A reading	Sand	60–1300	kN/m^2	20–50
	B reading	Clay	500–880	kN/m^2	10–35
DMT	B reading	Sand	350–2400	kN/m^2	20–50
	𝐼𝐷	Sand	1–8		20–60
	𝐾𝐷	Sand	2–30		20–60
	𝐸𝐷	Sand	10–50	MN/m^2	15–65
	𝑃𝐿	Clay	400–2800	kN/m^2	10–35
PMT	𝑃𝐿	Sand	1600–3500	kN/m^2	20–50
	𝐸PMT	Sand	5–15	MN/m^2	15–65
	𝑤𝑛	Clay and silt	13–100	%	8–30
	𝑤𝐿	Clay and silt	30–90	%	6–30
	𝑤𝑝	Clay and silt	15-15	%	6–30
Lab Index	PI	Clay and silt	10–40	%	—^a
	LI	Clay and silt	10	%	—^a
	𝛾, 𝛾𝐷	Clay and silt	13–20	kN/m^3	<10
	𝐷𝑟	Sand	30–70	%	10–40; 50–70^b

aCOV = (3–1.2%)/mean; ^bthe first range of variables gives the total variability for the direct method of determination, and the second range of values gives the total variability for the indirect determination using SPT values.