Which one of the following techniques of water distribution in the farms is sometimes called wild flooding?
- AFree floodingCorrect
- BCheck flooding
- CBorder flooding
- DFurrow irrigation method
Solution
Concept
Free flooding is also called wild flooding because water is released on the field without control of its flow.
Step-by-step solution
1. List the surface irrigation methods: free flooding, check flooding, border flooding and furrow irrigation. 2. In free flooding, water is let into the field from field ditches with no boundary or control. 3. Water spreads freely, like a wild flood. 4. So free flooding is also called wild flooding. 5. Answer is (A).
Explanation
In free flooding, water comes from field channels and moves freely over the land. There are no bunds or checks to control it, so it is called wild flooding. It is cheap but wastes water and gives uneven distribution.
Why the other options are wrong
(B) Check flooding uses bunds (checks) to control water, so it is not wild. (C) Border flooding guides water in strips between parallel borders, so it is controlled. (D) Furrow irrigation sends water only in small channels between crop rows, so it is not flooding of the whole field.
Shortcut
Free = Wild = No control.
Common mistake
Confusing check flooding with free flooding. Check flooding has bunds, so it is a controlled method.
Correct answer: A) Free flooding