How might the 1983 Thistle landslide have been prevented?
A)removal of the vegetation that added mass to the hillslope
B)rerouting of the highway that crossed the slide mass
C)construction of retaining walls at the foot of the slope
D)examination of landslide history and installation of drains

Question

Quizplus · Accepted Answer

Examining the history of landslides in the area and installing drainage systems would have helped to identify potential risks and prevent the accumulation of excess water which contributed to the Thistle landslide. Removing vegetation or rerouting the highway would not necessarily have addressed the underlying factors that led to the landslide. Construction of retaining walls may have offered some stabilization, but would not have addressed the root causes of the landslide.

How Might the 1983 Thistle Landslide Have Been Prevented