Question

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

The question was posed to me during an online interview.

This interesting question is from Buttress Dam in portion Arch and Buttress Dams of Irrigation Engineering

Answer 1

Right answer is (d) 12 to 15

For explanation: The suggested economic buttress spacing in m for a normal Φ value of 40° to 50° for different dam heights –

S.No

Mean Dam Height in m

Economic buttress spacing

1.

Less than 15

4.5

2.

15 – 30

4.5 to 7.5

3.

30 – 45

7.5 to 12

4.

Above 45

12 to 15