44.7. Duty and Delta Relationship

Try these first

1. 1.

   What is Duty in irrigation?

   Hint

   Think about how much area can be watered with a certain amount of water.

2. 2.

   How is Delta defined?

   Hint

   Consider the total water needs of the crops.

3. 3.

   What is the formula for Duty?

   • Area / Discharge
   • Discharge / Area
   • Area × Discharge

   Hint

   Think about how we determine the area per unit of water.

4. 4.

   True or False: Increasing Duty decreases the water requirement (Delta) for crops.

   • True
   • False

   Hint

   Consider the relationship between the two concepts.

5. 5.

   If an irrigation system has a duty of 12 hectares/cumec and a base period of 20 days, calculate the required Delta. How might this information influence planning for the agricultural season?

   Hint

   Use the formula for Delta to find the answer.

6. 6.

   Assuming a duty reduction to 6 hectares/cumec while the base period remains at 25 days, what will be the new Delta needed? Discuss the potential consequences on crop yield.

   Hint

   Consider what happens to the irrigation needs when Duty is altered significantly.