What is the suggested economic buttress spacing for a mean dam height of greater than 45 m?
A. 4.5
B. 4.5 to 7.5
C. 7.5 to 12
D. 12 to 15
Answer:D
What is the suggested economic buttress spacing for a mean dam height of greater than 45 m?
A. 4.5 B. 4.5 to 7.5 C. 7.5 to 12 D. 12 to 15