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Q: What will be the excess of water at the soil surface (mm), if the total precipitation is 150 mm, infiltration in soil is 5 cm and direct evaporation is 10 mm?
  • A. 50
  • B. 90
  • C. 65
  • D. 100
Correct Answer: Option B - Excess of water/Run off 'i' Run off = Precipitation – losses. Givens: Precipitation = 150 mm Infiltration = 5 cm = 50 mm evaporation = 10 mm. Putting values: R = 150 – (50 + 10) R = 90 mm
B. Excess of water/Run off 'i' Run off = Precipitation – losses. Givens: Precipitation = 150 mm Infiltration = 5 cm = 50 mm evaporation = 10 mm. Putting values: R = 150 – (50 + 10) R = 90 mm

Explanations:

Excess of water/Run off 'i' Run off = Precipitation – losses. Givens: Precipitation = 150 mm Infiltration = 5 cm = 50 mm evaporation = 10 mm. Putting values: R = 150 – (50 + 10) R = 90 mm