Critical Velocity of Flow

Q. Why do we need to do the lining of the canal?
(A) To minimize seepage losses in canal
(B) To prevent erosion of bed and sides due to high velocities
(C) To decrease the discharge in the canal section by increasing the velocity

1. Only A
2. Only A and B
3. Only C
4. All A, B and C

Q. Lining of irrigation canals:

1. Decrease the water logging area
2. Increase the water logging area
3. Does not change the water logging area
4. Increase evaporation.

Q. Among the classification of canals-based alignment criteria, identify the canal in which the number of cross drainage works is maximum?

1. Contour canal
2. Side slope canal
3. Ridge canal
4. Detour canal

Q. The best alignment for a canal is when it is aligned along:

1. Valley line
2. Stream line
3. Contour line
4. Ridge line.