FLOOD05740

• County: Denver
• Community: All
• Stream Name: All
• Basin: South Platte
• Title: Landslide Loss Reduction
• Date: 1/1/1989
• Prepared For: State of Colorado
• Prepared By: CGS
• Floodplain - Doc Type: Educational/Technical/Reference Information

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Figure 9a. Topple (Colorado Geological
Survey et al., 1988).

12

Figure 9b. Topple, western Colorado (photo-
graph by Colorado Geological Survey).

Rotational slide
A rotational slide is one in which the surface of
rupture is curved concavely upward (spoon
shaped) and the slide movement is more or less
rotational about an axis that is parallel to the
contour of the slope (Figures lOa, b). A "slump"
is an example of a small rotational slide.

Translational slide
In a translational slide, the mass moves out, or
down and outward along a relatively planar
surface and has little rotational movement or
backward tilting (Figure 11). The mass com- "
monly slides out on top of the original ground
surface. Such a slide may progress over great

Figure 10a. Rotational landslide (modified
from Varnes, 1978). '