Question:
Which one of the following is not preferred with respect to the Dam construction site is concerned?
Which one of the following is not preferred with respect to the Dam construction site is concerned?
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For a safe dam, the foundation should be strong, watertight and stable. The dip direction of rock strata strongly affects the stability and seepage behaviour of the dam.
Updated On: Jun 16, 2026
- Strata dipping downstream
- Presence of Igneous rock
- Presence of low permeable foundation strata
- Strata dipping upstream
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The Correct Option is A
Solution and Explanation
Concept:
For a safe dam, the foundation should be strong, watertight and stable. The dip direction of rock strata strongly affects the stability and seepage behaviour of the dam.
Step 1:
Strong igneous rock and low-permeable foundation strata are favourable, since they give strength and reduce seepage. Strata dipping upstream are preferred because the beds resist sliding and reduce leakage in the downstream direction.
Step 2:
Strata dipping downstream are not preferred, because the bedding planes incline toward the downstream side, encouraging the dam to slide along these planes and allowing water to seep along the strata, both reducing stability.
Answer: Option (1) — Strata dipping downstream.
For a safe dam, the foundation should be strong, watertight and stable. The dip direction of rock strata strongly affects the stability and seepage behaviour of the dam.
Step 1:
Strong igneous rock and low-permeable foundation strata are favourable, since they give strength and reduce seepage. Strata dipping upstream are preferred because the beds resist sliding and reduce leakage in the downstream direction.
Step 2:
Strata dipping downstream are not preferred, because the bedding planes incline toward the downstream side, encouraging the dam to slide along these planes and allowing water to seep along the strata, both reducing stability.
Answer: Option (1) — Strata dipping downstream.
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