This calculator helps estimate the rate of evaporation from a water surface. Evaporation is a crucial process in the water cycle, influencing weather patterns, agricultural irrigation, and water resource management. The rate of evaporation depends on several factors, including temperature, humidity, wind speed, and surface area. This tool provides a simplified estimation based on common meteorological data.
function calculateEvaporation() {
var surfaceArea = parseFloat(document.getElementById("surfaceArea").value);
var temperature = parseFloat(document.getElementById("temperature").value);
var humidity = parseFloat(document.getElementById("humidity").value);
var windSpeed = parseFloat(document.getElementById("windSpeed").value);
var duration = parseFloat(document.getElementById("duration").value);
var resultElement = document.getElementById("result");
resultElement.innerHTML = ""; // Clear previous results
if (isNaN(surfaceArea) || isNaN(temperature) || isNaN(humidity) || isNaN(windSpeed) || isNaN(duration)) {
resultElement.innerHTML = "Please enter valid numbers for all fields.";
return;
}
if (surfaceArea <= 0 || temperature 60 || humidity 100 || windSpeed < 0 || duration <= 0) {
resultElement.innerHTML = "Please enter realistic values.";
return;
}
// Simplified evaporation rate calculation (e.g., using Penman-Monteith or a simpler empirical formula)
// This is a very basic approximation for demonstration. Real-world calculations are more complex.
// A simplified empirical approach:
// Evaporation rate increases with temperature, wind speed, and surface area.
// Evaporation rate decreases with higher humidity.
var vaporPressureDeficit = (1 – (humidity / 100)) * (0.6108 * Math.exp((17.27 * temperature) / (temperature + 237.3))); // Simplified saturation vapor pressure calculation
// A very simple linear relationship for illustration purposes
// This formula is NOT scientifically accurate but serves to demonstrate calculator functionality.
var evaporationRatePerM2PerHour = 0.01 * temperature * (1 + 0.05 * windSpeed) * vaporPressureDeficit;
var totalEvaporationVolume = evaporationRatePerM2PerHour * surfaceArea * duration; // in m³
// Convert to liters for a more intuitive understanding if needed
var totalEvaporationLiters = totalEvaporationVolume * 1000;
resultElement.innerHTML =
"Estimated Evaporation Rate:" +
"Rate per m² per hour: " + evaporationRatePerM2PerHour.toFixed(4) + " mm/h (approx.)" +
"Total Volume Evaporated: " + totalEvaporationVolume.toFixed(2) + " m³" +
"Total Volume Evaporated: " + totalEvaporationLiters.toFixed(2) + " Liters";
}
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font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 500px;
margin: 20px auto;
background-color: #f9f9f9;
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text-align: center;
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gap: 15px;
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margin-bottom: 5px;
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.calculator-container button:hover {
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.calculator-result p {
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}
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}