1. What is Actual Evapotranspiration?

Actual Evapotranspiration is the quantity of water that is actually removed from a surface due to the processes of evaporation and transpiration. It represents the combined water loss from soil surfaces and vegetation through evaporation and plant transpiration processes.

2. How Does the Calculator Work?

The calculator uses the water balance equation:

Where:

• \( E_{et} \) — Actual Evapotranspiration (Cubic Meter per Second)
• \( P_{mm} \) — Precipitation (Millimeter)
• \( Q_{V} \) — Runoff Volume (Cubic Meter)
• \( \Delta S_{m} \) — Change in Soil Moisture Storage (Cubic Meter)

Explanation: This equation represents the water balance principle where precipitation input equals the sum of evapotranspiration, runoff, and changes in soil moisture storage.

3. Importance of Actual Evapotranspiration Calculation

Details: Accurate evapotranspiration estimation is crucial for water resource management, agricultural planning, irrigation scheduling, and understanding the hydrological cycle. It helps in assessing water availability and demand in various ecosystems.

4. Using the Calculator

Tips: Enter precipitation in millimeters, runoff volume in cubic meters, and change in soil moisture storage in cubic meters. All values should be measured over the same time period for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between actual and potential evapotranspiration?
A: Actual evapotranspiration is the real water loss occurring under current conditions, while potential evapotranspiration is the maximum possible water loss under ideal moisture conditions.

Q2: How does evapotranspiration affect water balance?
A: Evapotranspiration is a major component of the water balance equation, representing water loss from the system through evaporation and plant transpiration.

Q3: What factors influence actual evapotranspiration rates?
A: Temperature, humidity, wind speed, solar radiation, soil moisture availability, and vegetation type all influence evapotranspiration rates.

Q4: Why is evapotranspiration important for agriculture?
A: It helps determine crop water requirements, irrigation scheduling, and water management strategies to optimize agricultural productivity.

Q5: How is this calculation used in hydrological studies?
A: Hydrologists use evapotranspiration calculations to model water budgets, predict streamflow, and assess water availability in watersheds.