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Helical anchors in saturated soils

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Anyone know or know where to look for information regarding helical anchors in saturated soils? The browsing I've done on the internet only showed capacity of the anchors in a 'dry' condition I'm assuming.

I'm curious how these anchors fare in storm conditions where the ground may be saturated (heavy rain or flood).

More specifically, I've noticed the helical anchors are being specified for use in hold down applications where tornado or hurricane activity may be prevalent. So how do these anchors hold 'up' (really down without the pun) when the soil has been saturated?

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