44.7.1. Duty (D)

Try these first

1. 1.

   What is the formula for Duty?

   Hint

   Think about how area and water flow relate.

2. 2.

   Define Delta in the context of irrigation.

   Hint

   Delta relates to crop water needs over time.

3. 3.

   What does the term 'Duty' refer to in irrigation?

   • Amount of land irrigated by a unit discharge
   • Total depth of water needed
   • Base period days

   Hint

   Think about how water is distributed over land.

4. 4.

   True or False: Delta measures the area that can be irrigated.

   • True
   • False

   Hint

   Remember what each term specifically refers to.

5. 5.

   A field of 500 hectares has a discharge of 4 cumec. Calculate the Duty. After this, using a base period of 30 days, determine the Delta required for the crops.

   Hint

   Work step by step, starting with Duty and then applying the Delta formula.

6. 6.

   If a farmer has an irrigation system with a Duty of 100 hectares/cumec and calculates a Delta of 5 meters for a growing period of 20 days, is this efficient? Discuss reasons for your conclusion.

   Hint

   Think about ways to optimize the applied water completely in irrigation systems.