39.1.4. Typical Delta Values

Try these first

1. 1.

   What does delta (Δ) measure?

   Hint

   Think about what farmers need to know for each crop.

2. 2.

   What crop needs more water, wheat or rice?

   Hint

   Recall the delta values discussed.

3. 3.

   What is the typical delta range for wheat?

   • 10-20 cm
   • 40-50 cm
   • 60-70 cm

   Hint

   Think about the crops we've studied today.

4. 4.

   True or False: Rice requires less water than wheat.

   • True
   • False

   Hint

   Recall the delta values we discussed for these crops.

5. 5.

   Given that rice requires 120-140 cm of water over a base period of 135 days, calculate the total water volume required for 1,000 hectares.

   Hint

   Remember to convert hectares to the appropriate unit for volume.

6. 6.

   If cotton's delta is 70-85 cm over a base period of 200 days, how would you estimate the total irrigation system needed for a region with 50,000 hectares?

   Hint

   Make sure you account for the conversions for cm to m for your calculations.