Canal Design and Regulation MCQ with answer and solution

Concept

Seepage from unlined canals is a main cause of water logging, so lining canals is a very effective control method.

Step-by-step solution

1. Water logging means the water table rises and fills the root zone of crops. 2. A main cause is seepage from unlined canals and water courses. 3. Lining the canals stops this seepage at the source. 4. Flat topography and poor drainage are causes of water logging, not controls. 5. So the very effective method is lining of canals and water courses.

Explanation

Seepage from canals adds a lot of water to the ground and raises the water table. Lining the canals stops this seepage, so the water table does not rise. Standard textbooks call canal lining a very effective way to control water logging.

Why the other options are wrong

B: Flat topography is a cause of water logging, not a control method. C: Natural drainage is a site condition. It is not a method we apply. D: Surface drainage helps, but it removes only surface water. It does not stop canal seepage, which is the main source.

Shortcut

Stop the source first: line the canals to cut seepage.

Common mistake

Choosing a drainage option, or mixing up causes (flat land, poor drainage) with control methods.