39.3. Relationship Between Duty and Delta

Try these first

1. 1.

   Define Duty in the context of irrigation.

   Hint

   Think about what area is covered with how much water.

2. 2.

   What does Delta represent?

   Hint

   Consider the crop's water requirements from sowing to harvesting.

3. 3.

   What does Duty represent in irrigation?

   • Area that can be irrigated
   • Depth of water required
   • Amount of rainfall needed

   Hint

   Relate it to area covered by water discharge.

4. 4.

   True or False: Delta is constant regardless of crop type.

   • True
   • False

   Hint

   Think about how different crops' water needs differ.

5. 5.

   A canal supplies water at 12 cumecs, and during its operation, it irrigates 30,000 hectares. Calculate the Duty and then find Delta if the base period is 150 days.

   Hint

   Calculate Duty first, then apply it to the Delta formula.

6. 6.

   If a farmer wants to irrigate an area of 50 hectares and the required Delta is found to be 75 cm, what should the Duty be if the base period is 120 days? Show your calculations.

   Hint

   Reorganize the Delta formula to find Duty.