Question

Choose the correct statement(s):

• A. Gravity dam is a rigid structure, straight or slightly curved in places.
• B. Arch dams are commonly built on very strong foundations.
• C. Buttress dam chiefly consists of reinforced concrete slab that slopes upstream.
• D. Earth dams have a concrete wall curved with convex face pointed towards the upstream.

Hint:

Arch dams are designed to transfer the weight of the water to the valley walls, requiring strong rock foundations.

Answer 1

The Correct Option is A, C

Step 1: Analyzing the types of dams.
- (A) Gravity dams are indeed rigid, and they may or may not be slightly curved, depending on design.
- (B) Arch dams are typically built on very strong, stable foundations, as they rely on the strength of the rock to support the structure.
- (C) Buttress dams are supported by multiple reinforced concrete buttresses, not by a single slab that slopes upstream.
- (D) Earth dams typically have a sloped surface, not a concrete wall. Their structure is not curved in the manner described.

Step 2: Conclusion.
The correct answer is (B) Arch dams are commonly built on very strong foundations.