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The measure of actual water evaporated and transpired, limited by the available water. AET is critical in irrigation planning for calculating the actual water demand and ensuring water is used efficiently without over-irrigation.

The sum of evaporation and plant transpiration from the Earth's land and ocean surface to the atmosphere. ET is important in irrigation planning to estimate the amount of water required by crops to compensate for the water lost through these processes.

An accounting method to track the amount of water entering and leaving a soil system. Soil water balance is used in irrigation planning to determine when and how much to irrigate based on the soil's water holding capacity and deficit.

The specific climate conditions in a very small or restricted area, especially as they influence ET rates. Microclimate considerations are important in irrigation planning because local variations can affect the amount of water required by crops.

The amount of water that would be evaporated and transpired if there was sufficient water available. PET is important for irrigation planning as it represents the upper limit of water needed by crops under optimal moisture conditions.

A baseline rate of ET from a standardized crop like grass or alfalfa, ignoring crop-specific factors. ETo is used in irrigation planning as a starting point to estimate crop water needs by applying crop coefficients.

The ratio of the amount of water beneficially used by a crop to the total amount of water applied. Improving irrigation efficiency is important to ensure water is not wasted, and it is influenced by factors that include ET rates.