1) Were the designers aware that this valley was landslide-prone before they built the dam? What feature of Fig. 1 suggests an answer?
2) Read the description of the Malm Formation under "The geologic setting". List all words here that you are certain are significant in conveying to the reader a problem with respect to slope stability.
3) Note the wide U-shaped profile of the upper (outer) portion of the valley as opposed to the steep V-shaped profile of the lower (inner) portion of the valley. Can you explain why this form exists? Is the form meaningful in terms of the dam?