Volume Of Water Lost In Evaporation In Month Calculator

Formula Used:

\[ VE = AR \times Epm \times Cp \]

Volume Of Water Lost In Evaporation (VE):

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1. What is Volume Of Water Lost In Evaporation?

Volume Of Water Lost In Evaporation in a month is the transfer of liquid water into vapor state to the atmosphere. It represents the quantity of water that evaporates from a reservoir surface over a monthly period.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ VE = AR \times Epm \times Cp \]

Where:

\( VE \) — Volume of Water Lost in Evaporation (m³)
\( AR \) — Average Reservoir Area during the month (m²)
\( Epm \) — Pan Evaporation Loss during the month (m)
\( Cp \) — Relevant Pan Coefficient (dimensionless)

Explanation: The formula calculates water evaporation volume by multiplying the reservoir area by the measured pan evaporation and applying a pan coefficient to adjust for differences between pan and reservoir evaporation rates.

3. Importance of Evaporation Calculation

Details: Accurate evaporation calculation is crucial for water resource management, reservoir operation planning, irrigation scheduling, and understanding water balance in hydrological systems.

4. Using the Calculator

Tips: Enter average reservoir area in square meters, pan evaporation loss in meters, and relevant pan coefficient. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is pan evaporation measurement?
A: Pan evaporation is a measurement that combines or integrates the effects of several climate elements including temperature, humidity, wind speed, and solar radiation.

Q2: Why is a pan coefficient needed?
A: The pan coefficient is needed because evaporation from a standard pan differs from evaporation from a large water body due to differences in heat storage, wind exposure, and other factors.

Q3: What are typical values for pan coefficients?
A: Pan coefficients typically range from 0.6 to 0.8 for large reservoirs, but can vary based on location, season, and specific reservoir characteristics.

Q4: How often should evaporation be measured?
A: Evaporation is typically measured daily using evaporation pans, with monthly totals used for water balance calculations and reservoir management.

Q5: What factors affect evaporation rates?
A: Temperature, humidity, wind speed, solar radiation, and water quality all affect evaporation rates from water surfaces.