44.3.1. Definition

Try these first

1. 1.

   What is effective rainfall?

   Hint

   Think about how rainfall meets crop needs.

2. 2.

   Why is knowing effective rainfall important?

   Hint

   Consider how water management affects farming.

3. 3.

   What is effective rainfall?

   • Total rainfall
   • Usable precipitation for crops
   • Evaporated water

   Hint

   Focus on what part of rainfall helps crops grow.

4. 4.

   True or False: Effective rainfall includes all precipitation.

   • True
   • False

   Hint

   Think about the difference between total and usable rainfall.

5. 5.

   A region receives 120 mm of rain over a growing season. Due to evaporation and runoff, only 80 mm is available for crops. Calculate the effective rainfall and discuss its implications for irrigation.

   Hint

   Consider total rain and available usable water.

6. 6.

   Given weather data shows 200 mm of rainfall, but analysis reveals 50 mm is lost through evaporation, estimate how much irrigation is needed if the crop requires a total of 150 mm of water.

   Hint

   Utilize the effective rainfall calculation to assess irrigation needs.