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An open ended steel barrel of 1 m height and 1 m diameter is filled with saturated fine sand having coefficient of permeability of 10–2 m/s. The barrel stands on a saturated bed of gravel. The time required for the water level in the barrel to drop by 0.75 m is
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- 58.9 s
- 75 s
- 100 s
- 150 s
Correct Option: B
k = 10–2 m/s i.e., water travels 10–2 in 1 second.
∴ Time taken by water level to drop by 0.75 m
| = | = 75 s | 10–2 m/s |
