[amp_mcq option1=”0.5 m/sec” option2=”1 m/sec” option3=”1.5 m/sec” option4=”2 m/sec” correct=”option1″]
The correct answer is: A. 0.5 m/sec
The approximate permissible velocity of water in a concrete canal should not exceed 0.5 m/sec. This is because a higher velocity can cause erosion of the canal bed and banks, as well as damage to the canal lining. Additionally, a higher velocity can increase the risk of flooding.
Option B is incorrect because a velocity of 1 m/sec is too high and can cause erosion and damage to the canal. Option C is incorrect because a velocity of 1.5 m/sec is also too high and can cause the same problems. Option D is incorrect because a velocity of 2 m/sec is even higher and is even more likely to cause erosion and damage to the canal.
In conclusion, the approximate permissible velocity of water in a concrete canal should not exceed 0.5 m/sec.