Question

Which of the following statement is correct for duty of water ?

• A. It increases with an increase in temperature.
• B. It increases with an increase in wind speed.
• C. It increases with an increase in humidity.
• D. It is not affected by climatic conditions.

Answer 1

The correct option is C It increases with an increase in humidity.

Factors affecting duty of water: The duty of water mainly depends on the following factors such as:
1. Type of crop.
2. Climatic condition of the area.
(a) Temperature (high temperature requires high discharge. So, duty will decrease).
(b) Wind Velocity. (As wind velocity increases, the required discharge will be more so duty will decrease).
(c) Humidity. (As humidity increases, the required discharge will be less, so duty will increase.
(d) Rainfall. (If rainfall occurs, the required discharge will be less, so duty will increase.
3. System of irrigation.
4. Method of irrigation.
5. Quality of irrigation water.

6. Method of cultivation.
7. Time of irrigation and frequency of cultivation.
8. Type of soil and subsoil of the area through which canal passes.
9. Canal conditions.
10. Base period of the crop.
Note:

• The term duty means the area of land that can be irrigated with the unit volume of irrigation water.
• It can also be defined as the area of land in hectares that can be irrigated if 1 cumec of water is supplied continuously to the land throughout the base period.

${\text{For Example: If 1500 ha of land can be irrigated for growing any crop by 1 m}}^3\text{/s of water supplied continuously, for the entire base period of the crop, then the duty of water for this crop is 1500 ha/cumec.}$