The primary purpose of a gravity dam is to
- AIncrease the velocity of river flow
- BDivert water into a canal
- CPrevent groundwater depletion
- DWithstand external forces using their weightCorrect
Solution
Concept
Principle of a gravity dam
Step-by-step solution
1. A gravity dam resists the water pressure and other forces by its own weight. 2. Stability is ensured against overturning, sliding and tension.
Explanation
A gravity dam is a massive structure of masonry or concrete designed so that its self weight balances the horizontal water thrust and uplift, keeping the foundation stresses within limits.
Shortcut
Gravity dam = weight resists thrust.
Common mistake
Choosing diversion since dams "control" water.
Correct answer: D) Withstand external forces using their weight