Taxa Evaporação (água)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The evaporation rate calculator (water) estimates the daily loss of water vapor from a surface, typically averaging 4-6 mm per day. It uses air temperature, relative humidity, wind speed, and solar radiation to compute potential evapotranspiration. This tool is useful for irrigation planning, reservoir management, or environmental studies. Accuracy depends on local measurement quality and regional climate variability.
The general formula accounts for air's capacity to absorb water vapor, primarily driven by climatic factors. Evaporation rates are higher in hot, dry areas and slower in humid regions with low wind. This calculation helps farmers adjust irrigation frequency based on natural soil water loss.
For reliable results, use region-specific data from local weather stations or climate sensors. Avoid applying average values directly in areas with distinct microclimates. The calculator focuses solely on direct water evaporation and does not include plant transpiration.
Frequently asked questions
Why is evaporation rate measured in millimeters per day?
Millimeters per day is a standard unit representing the depth of water evaporated over an area, allowing comparisons between locations or periods.
Does the calculator include plant transpiration?
No, this tool focuses only on direct water evaporation. For combined evaporation and transpiration, use a combined evapotranspiration calculator.
How to use results for irrigation planning?
Compare the calculated rate with the crop's water needs. If evaporation is high, increase irrigation frequency or volume accordingly.
Can I use data from remote weather stations?
No, local data is recommended because factors like topography, soil moisture, and vegetation significantly affect regional evaporation rates.
Is the calculator accurate in rainy regions?
In rainy areas, net evaporation (evaporation minus rainfall) is more relevant. This tool calculates potential evaporation, requiring manual adjustments for real-world conditions.