The correct answer is: A. Percentage of culturable commanded area to be irrigated annually.
The intensity of irrigation is the percentage of culturable commanded area that is irrigated annually. It is a measure of the amount of water that is used for irrigation. The intensity of irrigation can be affected by a number of factors, including the climate, the type of crop, and the soil type.
The culturable commanded area is the area of land that is suitable for irrigation and that has access to irrigation water. The gross commanded area is the total area of land that is under irrigation. The mean of the culturable commanded area and the gross commanded area is not a meaningful measure of irrigation intensity. The total depth of water supplied by the number of waterings is not a meaningful measure of irrigation intensity.
Here are some additional details about each option:
- Option A: Percentage of culturable commanded area to be irrigated annually. This is the most common definition of irrigation intensity. It is a measure of the amount of water that is used for irrigation. The intensity of irrigation can be affected by a number of factors, including the climate, the type of crop, and the soil type.
- Option B: Percentage of gross commanded area to be irrigated annually. This is not a meaningful measure of irrigation intensity. The gross commanded area is the total area of land that is under irrigation. This includes land that is not suitable for irrigation and land that does not have access to irrigation water.
- Option C: Percentage of the mean of culturable commanded area and the gross commanded area to be irrigated annually. This is not a meaningful measure of irrigation intensity. The mean of the culturable commanded area and the gross commanded area is not a meaningful measure of the amount of water that is used for irrigation.
- Option D: Total depth of water supplied by the number of waterings. This is not a meaningful measure of irrigation intensity. The total depth of water supplied by the number of waterings does not take into account the area of land that is irrigated.