Q187
What was a key cause of failure in the St. Francis Dam (1928)?
A.
Construction in sedimentary basin
B.
Water overtopping
C.
Geological instability due to schist
AnswerD.
Fault slip
Answer: Option C
Solution
Answer: Option C
Solution:
The failure occurred due to geological instability in schist and faulted rock. Water seepage weakened the foundation, and the dam collapsed catastrophically.