39.1.1. Definition

Try these first

1. 1.

   What does Delta (Δ) represent in irrigation?

   Hint

   Think about how much water a plant needs from seeding to harvest.

2. 2.

   What is Duty (D) in relation to irrigation?

   Hint

   Consider how we measure water efficiency for irrigation.

3. 3.

   What does Delta (Δ) measure in irrigation?

   • Depth of water required
   • Area irrigated
   • Discharge of water

   Hint

   Focus on what crops need for their growth.

4. 4.

   True or False: Duty (D) is the volume of water supplied to crops.

   • True
   • False

   Hint

   Think about how water is applied to areas.

5. 5.

   An irrigation system has a discharge of 15 cumecs and can irrigate 30,000 hectares. Determine the Duty and subsequently calculate the Delta for a base period of 150 days.

   Hint

   First, find Duty, then apply it to calculate Delta.

6. 6.

   Analyze how the type of crop and irrigation method can affect the Duty requirement for a given amount of water usage.

   Hint

   Compare traditional irrigation methods with modern techniques.