Design a drip irrigation system: calculate emitter count, spacing, flow rate, and pipe sizing.
Enter your field dimensions (length and width in meters), desired emitter spacing along the drip line (centimeters), spacing between drip lines/rows (meters), and emitter flow rate (liters per hour). Click "Calculate" to see number of drip lines/rows, emitters per line, total number of emitters, system flow rate in liters per second and per hour, and water application rate.
The drip irrigation system designer helps you plan and size a drip irrigation system for your field or garden. It calculates the number of drip lines, emitters, total flow rate, and water application requirements. Proper drip system design ensures uniform water distribution, adequate flow capacity, and efficient water use. Drip irrigation is 85-95% efficient (compared to 50-70% for flood irrigation), reduces weed growth, and enables precise fertigation (fertilizer application through irrigation water).
A: Emitter spacing depends on crop type and soil texture: close spacing (20-30cm) for shallow-rooted crops (lettuce, strawberries, onions) and sandy soils (water doesn't spread far); medium spacing (40-60cm) for vegetables (tomatoes, peppers, cucumbers) and loamy soils; wide spacing (75-100cm) for deep-rooted crops (trees, vines, melons) and clay soils (water spreads widely). Emitter flow rate: 1-2 L/h for sandy soils and close spacing (prevents runoff), 2-4 L/h for loamy soils, 4-8 L/h for clay soils and wide spacing. Common emitter types: online emitters (punched into tubing, adjustable), inline emitters (built into drip tape, fixed flow), pressure-compensating emitters (maintain constant flow regardless of pressure variation, essential for long lines or sloping terrain). For most vegetable gardens, 2 L/h emitters at 30cm spacing on 1.5m row spacing is a good starting point.
A: Drip systems typically require 0.5-1.5 bar (7-22 psi) at the emitters. Pressure requirements: inline drip tape 0.5-1.0 bar, online emitters 1.0-1.5 bar, pressure-compensating emitters 1.0-3.5 bar. Total system pressure = emitter pressure + friction loss in mainline + friction loss in submain + elevation gain (0.1 bar per meter elevation). Pipe sizing: use the Hazen-Williams or Darcy-Weisbach equation to calculate friction loss. General guideline: mainline velocity should not exceed 1.5 m/s (to avoid excessive friction loss and water hammer), submain velocity < 1.0 m/s, drip line velocity < 0.6 m/s. For a 50m x 20m field with 2 L/h emitters at 30cm spacing on 1.5m rows: ~14 rows × 167 emitters = 2338 emitters × 2 L/h = 4676 L/h = 1.3 L/s. This requires a 40-50mm mainline and a pump delivering 5 m³/h at 2 bar pressure. Always include a 20% safety margin for flow and pressure.
A: A complete drip irrigation system includes: water source (well, pond, municipal supply, rainwater tank); pump (if source pressure is insufficient — size for total system flow + 20% margin); filtration system (screen filter 120-150 mesh for clean water, media filter for sandy/murky water — filtration is critical to prevent emitter clogging); fertilizer injector (venturi, proportioner, or injection pump for fertigation); pressure regulator (reduces and maintains constant pressure to emitters); mainline (PVC or HDPE pipe, permanent, carries water from source to field); submain/lateral (smaller pipe, distributes water to drip lines); drip lines/tape (with emitters, placed along crop rows); end caps/flushes (for flushing sediment from lines); valves (to control different zones); and pressure gauges/flow meters (for monitoring and troubleshooting). Optional: soil moisture sensors, timer/controller for automated scheduling, pressure-compensating emitters for uniform distribution. Budget: $1,000-5,000 for a 0.5ha system, $5,000-20,000 for a 5ha system, depending on automation level.