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Relevant Pan Coefficient Formula:
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The Relevant Pan Coefficient is the ratio of the amount of evaporation from a large body of water to that measured in an evaporation pan. It helps in accurately estimating evaporation losses from reservoirs and other water bodies.
The calculator uses the Relevant Pan Coefficient formula:
Where:
Explanation: The formula calculates the ratio between actual evaporation from a reservoir and the evaporation measured in a standard pan, accounting for differences in surface area and environmental conditions.
Details: Accurate calculation of pan coefficient is crucial for water resource management, reservoir operation planning, irrigation scheduling, and hydrological studies. It helps in predicting water losses due to evaporation more precisely.
Tips: Enter volume of water lost in evaporation in cubic meters, average reservoir area in square meters, and pan evaporation loss in meters. All values must be positive numbers.
Q1: What is a typical range for pan coefficients?
A: Pan coefficients typically range from 0.6 to 0.8, but can vary based on climate conditions, pan type, and water body characteristics.
Q2: Why is pan evaporation measurement important?
A: Pan evaporation provides a simple and cost-effective method to estimate evaporation rates, which is essential for water balance calculations and irrigation management.
Q3: How often should pan evaporation be measured?
A: Daily measurements are recommended for accurate results, with monthly averages used for most hydrological calculations.
Q4: What factors affect the pan coefficient?
A: Wind speed, humidity, temperature, pan color, installation height, and surrounding environment can all affect the pan coefficient value.
Q5: Can this coefficient be used for all types of water bodies?
A: While the principle is similar, coefficients may need adjustment for different water body types (lakes, reservoirs, ponds) and local conditions.