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| Q.47 | A masonry dam has pervious sand as the foundation. Calculate the maximum permissible upward gradient (rounded up to 2 decimals after point), if the factor of safety 4 is required against boiling of sand. (Take porosity (n) = 45% and specific gravity (G) of sand = 2.65.) | |
| Ans | 1. 0.35 | |
| 2. 0.65 | ||
| 3. 0.55 | ||
| 4. 0.23 |
Correct Ans Provided: 4
