Drip Irrigation Flow Rate Calculator
ANA›Life Services Authority›National Calculator Authority›Drip Irrigation Flow Rate Calculator
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Drip Irrigation Flow Rate Calculator
Calculate total system flow rate, application rate (mm/hr), and water volume needed for drip irrigation based on emitter specifications, spacing, and field dimensions.
Emitter Flow Rate (L/hr)
Emitter Spacing Along Lateral (m)
Lateral Line Spacing (m)
Field Area (m²)
Irrigation Duration (hours)
System Efficiency (%)
Calculate Results will appear here.
function driCalc() { const resultDiv = document.getElementById('dri-result');
const emitterFlow = parseFloat(document.getElementById('dri-emitter-flow').value); const emitterSpacing = parseFloat(document.getElementById('dri-emitter-spacing').value); const lateralSpacing = parseFloat(document.getElementById('dri-lateral-spacing').value); const fieldArea = parseFloat(document.getElementById('dri-field-area').value); const irrigTime = parseFloat(document.getElementById('dri-irrigation-time').value); const efficiency = parseFloat(document.getElementById('dri-efficiency').value);
// --- Validation --- if (isNaN(emitterFlow) || emitterFlow ⚠ Please enter a valid emitter flow rate (> 0 L/hr).'; return; } if (isNaN(emitterSpacing) || emitterSpacing ⚠ Please enter a valid emitter spacing (> 0 m).'; return; } if (isNaN(lateralSpacing) || lateralSpacing ⚠ Please enter a valid lateral spacing (> 0 m).'; return; } if (isNaN(fieldArea) || fieldArea ⚠ Please enter a valid field area (> 0 m²).'; return; } if (isNaN(irrigTime) || irrigTime ⚠ Please enter a valid irrigation duration (> 0 hours).'; return; } if (isNaN(efficiency) || efficiency 100) { resultDiv.innerHTML = '⚠ Please enter a system efficiency between 1 and 100%.'; return; }
// --- Calculations ---
// Area served per emitter (m²) const areaPerEmitter = emitterSpacing * lateralSpacing;
// Total number of emitters in the field const numEmitters = fieldArea / areaPerEmitter;
// Total system flow rate (L/hr) const totalFlowLhr = numEmitters * emitterFlow;
// Total system flow rate (m³/hr) const totalFlowM3hr = totalFlowLhr / 1000;
// Application rate (mm/hr) // = emitter flow (L/hr) / area per emitter (m²) * conversion (1 L/m² = 1 mm) const appRateMmHr = emitterFlow / areaPerEmitter;
// Effective application rate accounting for efficiency (mm/hr) const effAppRateMmHr = appRateMmHr * (efficiency / 100);
// Total water depth applied per session (mm) const waterDepthMm = effAppRateMmHr * irrigTime;
// Total volume applied per session (m³) const totalVolM3 = (waterDepthMm / 1000) * fieldArea;
// Total volume applied per session (L) const totalVolL = totalVolM3 * 1000;
// Gross volume needed (accounting for efficiency losses) const grossVolM3 = totalVolM3 / (efficiency / 100); const grossVolL = grossVolM3 * 1000;
// --- Output --- resultDiv.innerHTML = '### Results ' + '' + 'Area per Emitter' + areaPerEmitter.toFixed(4) + ' m²' + 'Number of Emitters' + Math.round(numEmitters).toLocaleString() + '' + 'Total System Flow Rate' + totalFlowLhr.toFixed(2) + ' L/hr (' + totalFlowM3hr.toFixed(4) + ' m³/hr)' + 'Gross Application Rate' + appRateMmHr.toFixed(4) + ' mm/hr' + 'Effective Application Rate' + effAppRateMmHr.toFixed(4) + ' mm/hr (at ' + efficiency + '% efficiency)' + 'Water Depth Applied per Session' + waterDepthMm.toFixed(2) + ' mm' + 'Net Volume Applied per Session' + totalVolL.toFixed(2) + ' L (' + totalVolM3.toFixed(4) + ' m³)' + 'Gross Volume Required per Session' + grossVolL.toFixed(2) + ' L (' + grossVolM3.toFixed(4) + ' m³)' + ''; }
#### Formulas Used
Area per Emitter (m²): Aemitter = Se × Sl
Number of Emitters: N = Afield / Aemitter
Total System Flow Rate (L/hr): Qtotal = N × qe
Gross Application Rate (mm/hr): AR = qe / Aemitter [since 1 L/m² = 1 mm]
Effective Application Rate (mm/hr): AReff = AR × (E / 100)
Water Depth Applied (mm): D = AReff × T
Net Volume Applied (m³): Vnet = (D / 1000) × Afield
Gross Volume Required (m³): Vgross = Vnet / (E / 100)
Where: Se = emitter spacing (m), Sl = lateral spacing (m), qe = emitter flow rate (L/hr), Afield = field area (m²), T = irrigation duration (hr), E = system efficiency (%).
#### Assumptions & References
- Formulas based on: FAO Irrigation and Drainage Paper No. 36 — Yield Response to Water and FAO Paper No. 45 — Guidelines for Design and Evaluation of Micro-Irrigation Systems.
- Keller, J. & Bliesner, R.D. (1990). Sprinkle and Trickle Irrigation. Van Nostrand Reinhold, New York.
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