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Irrigation - Engineering

Q1:

Effective precipitation for a crop may be defined as

A total precipitation minus the loss due to evaporation

B total precipitation minus the loss due to infiltration

C total precipitation during the crop period

D available water stored in soil within root zone of the crop.

ANS:D - available water stored in soil within root zone of the crop.

Effective Precipitation (EP) is the amount of precipitation that is actually added and stored in the soil. During drier periods less than 5mm of daily rainfall would not be considered effective, as this amount of precipitation would likely evaporate from the surface before soaking into the ground.