1. What is the Water Evaporation Rate Equation?

The evaporation rate equation estimates how quickly water evaporates based on wind speed and vapor pressure deficit. It's commonly used in hydrology, agriculture, and environmental studies to predict water loss from surfaces.

2. How Does the Calculator Work?

The calculator uses the evaporation rate equation:

Where:

• \( Rate \) — Evaporation rate (mm/day)
• \( Wind \) — Wind speed (km/day)
• \( Vapor\ Pressure\ Deficit \) — The difference between saturation vapor pressure and actual vapor pressure (kPa)

Explanation: The equation accounts for the combined effects of wind speed and atmospheric dryness on evaporation rate.

3. Importance of Evaporation Rate Calculation

Details: Calculating evaporation rate is crucial for water resource management, irrigation planning, and understanding hydrological cycles in different environments.

4. Using the Calculator

Tips: Enter wind speed in km/day and vapor pressure deficit in kPa. Both values must be valid (wind ≥ 0, VPD > 0).

5. Frequently Asked Questions (FAQ)

Q1: What factors affect evaporation rate?
A: Besides wind and VPD, temperature, humidity, surface area, and water purity also affect evaporation rates.

Q2: What are typical evaporation rates?
A: Rates vary widely but typically range from 1-10 mm/day in most climates, with higher rates in hot, dry, windy conditions.

Q3: How is vapor pressure deficit calculated?
A: VPD = Saturation vapor pressure (at current temperature) - Actual vapor pressure (based on humidity).

Q4: Are there limitations to this equation?
A: This is a simplified model. For precise applications, local calibration or more complex models may be needed.

Q5: Can this be used for other liquids?
A: No, this equation is specifically for water. Other liquids have different evaporation characteristics.