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

Table 8

Relationship between 𝑁_1,60, density, and friction angle of sands.

𝑁1,60	Density	Friction angle, ϕ°
		Kulhawy and Mayne [18]	Peck et al. [19]	Schmertmann [20]	Hatanaka and Uchida [21]
<5	Very loose	<31	<29	<28	<30
5–15	Loose	30–36	29–31	28–38	30–37
15–30	Medium	35–41	31–35	38–44	37–44
30–50	Dense	40–46	35–41	44–49	44–52
>50	Very dense	>42	>41	>49	>50