Hose Flow Rate Calculator
This calculator helps you estimate the flow rate of water through a hose based on the pressure and the hose's diameter and length. Understanding your hose's flow rate is crucial for various applications, from gardening to firefighting, ensuring you have adequate water delivery.
Understanding Hose Flow Rate
The flow rate of water through a hose is influenced by several factors, primarily the pressure at the source and the resistance within the hose. The resistance is determined by the hose's diameter (a larger diameter means less resistance) and its length (a longer hose means more resistance due to friction).
The calculation uses the Hazen-Williams equation, a common empirical formula used in hydraulic engineering to estimate pressure loss and flow rate in pipes and hoses. The simplified version for flow rate (Q) in Gallons Per Minute (GPM) is:
Q = 29.73 x D2.63 x (P/L)0.54
Where:
- Q = Flow Rate in Gallons Per Minute (GPM)
- D = Hose Inner Diameter in inches
- P = Pressure in PSI
- L = Hose Length in feet
It's important to note that this is an estimation. Actual flow rates can vary due to factors such as the smoothness of the hose's interior, the presence of any kinks or obstructions, and the efficiency of the water source.
.hose-flow-calculator {
font-family: sans-serif;
max-width: 700px;
margin: 20px auto;
padding: 20px;
border: 1px solid #ccc;
border-radius: 8px;
background-color: #f9f9f9;
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.hose-flow-calculator h2, .hose-flow-calculator h3 {
text-align: center;
color: #333;
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.inputs, .results, .explanation {
margin-top: 20px;
padding: 15px;
background-color: #fff;
border-radius: 5px;
border: 1px solid #eee;
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.form-group {
margin-bottom: 15px;
}
.form-group label {
display: block;
margin-bottom: 5px;
font-weight: bold;
color: #555;
}
.form-group input[type="number"] {
width: calc(100% – 22px);
padding: 10px;
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color: white;
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border-radius: 4px;
cursor: pointer;
font-size: 16px;
transition: background-color 0.3s ease;
}
.hose-flow-calculator button:hover {
background-color: #45a049;
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#result {
font-size: 1.2em;
font-weight: bold;
color: #d9534f;
text-align: center;
margin-top: 10px;
}
.explanation ul {
list-style-type: disc;
margin-left: 20px;
}
.explanation li {
margin-bottom: 8px;
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.explanation strong {
color: #333;
}
function calculateFlowRate() {
var pressure = parseFloat(document.getElementById("pressurePSI").value);
var diameter = parseFloat(document.getElementById("hoseDiameterInches").value);
var length = parseFloat(document.getElementById("hoseLengthFeet").value);
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
if (isNaN(pressure) || isNaN(diameter) || isNaN(length)) {
resultDiv.innerHTML = "Please enter valid numbers for all fields.";
return;
}
if (pressure <= 0 || diameter <= 0 || length <= 0) {
resultDiv.innerHTML = "Please enter positive values for pressure, diameter, and length.";
return;
}
// Hazen-Williams equation for flow rate (Q) in GPM
// Q = 29.73 * D^2.63 * (P/L)^0.54
var flowRateGPM = 29.73 * Math.pow(diameter, 2.63) * Math.pow(pressure / length, 0.54);
resultDiv.innerHTML = flowRateGPM.toFixed(2) + " GPM";
}