39.7. Practical Application and Example

Try these first

1. 1.

   Define Duty in the context of irrigation.

   Hint

   Think about what area and discharge mean in irrigation.

2. 2.

   What does Delta represent?

   Hint

   Consider the water needs of crops over time.

3. 3.

   What does Duty measure?

   • Total volume of water
   • Area that can be irrigated per unit discharge
   • Crop yield

   Hint

   Focus on the meanings of the terms used in irrigation.

4. 4.

   True or False: Delta represents water depth required over the entire growth period of a crop.

   • True
   • False

   Hint

   Consider the stages of crop growth and their water needs.

5. 5.

   A new irrigation project plans to use 12 cumecs to irrigate 40,000 hectares. Calculate the expected Duty and if the base period lasts 140 days, find Delta.

   Hint

   Use the formulas D = A/Q for Duty and Δ = 8.64 × B / D for Delta.

6. 6.

   Considering the implications of soil type on Duty, how would sandy soil compared to clay soil affect Duty and water management strategies?

   Hint

   Think about how soil composition changes water retention and loss.