Q37
The cause of the St. Francis Dam disaster in California (1928) was:
A.
Foundation weakness in schist
AnswerB.
Fault movement
C.
Rainfall-triggered overtopping
D.
Seepage under the dam
Answer: Option A
Solution
Answer: Option A
Solution:
The dam failed due to a geological misinterpretation of weak schist and faulted conglomerate in the foundation, causing a massive collapse.