Discussion
A dam abutment founded across a fault is a concern chiefly because the fault may
Answer: C
Correct answer: provide a leakage path and a plane of weakness
A fault crossing a dam abutment threatens the works twice over. Its crushed and often permeable material gives water a route around or beneath the structure, and the reservoir head drives flow along it; and it is a surface of low shear strength on which the abutment or the foundation may slide. Both are addressed before construction, by excavating and backfilling the zone and by grouting, and both have caused dam failures.
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