Question

The type of arch dam which generally requires overhangs at abutments is of ________________________

(a) constant radius type

(b) variable radius type

(c) constant angle type

(d) variable angle type

I had been asked this question by my college director while I was bunking the class.

The above asked question is from Arch Dams topic in portion Arch and Buttress Dams of Irrigation Engineering

Answer 1

Correct answer is (c) constant angle type

For explanation I would say: The design of a constant angle dam usually involves providing overhangs at abutments which requires stronger foundations. Hence, they are not used if the foundations are weak. Such a dam proves to be most economical out of all other dams.