Calculators · Water, nutrients & feed
Drip Irrigation Designer.
Drip Irrigation Designer
From kitchen garden to orchard. Emitter type and spacing, line length per zone, run time per cycle, parts BOM.
Emitter types
| Type | Best for | Flow rate | Notes |
|---|---|---|---|
| Drip tape (T-tape, Aqua-Traxx) | Row crops, large gardens, agricultural | 0.2-0.5 GPH per emitter; 4-12" spacing built in | Cheapest per foot; replace every 2-5 years; thin-wall |
| 1/2" pressure-comp dripline | Permanent installations, raised beds, landscaping | 0.5-1 GPH per emitter at 6-18" spacing | Long-lasting; pressure-compensating models even-flow on slopes |
| Inline emitter line (1/4") | Small spaces; container groups | 0.5 GPH per emitter | Flexible distribution; short runs |
| Button / point-source emitters | Trees, shrubs, individual plants | 0.5-4 GPH each | Custom placement; replaceable |
| Micro-spray / spinners | Citrus, larger trees, propagation | 2-20 GPH | Wider coverage; not technically "drip"; higher pressure needed |
| Soaker hose | Hobby; cheap wash-out | ~30-60 GPH per 50 ft | Inconsistent flow; degrade fast; not for permanent systems |
System pressure & filtration
| Component | Specification |
|---|---|
| Pressure regulator (mandatory) | 10-25 psi for drip tape; 25-30 psi for dripline; 50 psi for micro-sprinkler |
| Filter (mandatory) | 150-mesh (well water) or 200-mesh (municipal). Drip emitters clog with anything bigger. |
| Backflow preventer | Required by code in most jurisdictions if connected to drinking water |
| Manual or solenoid valve | Per zone; allows independent run times |
| Fertigation injector (optional) | Mazzei venturi or Dosatron; injects fertilizer into water stream |
| Air vent / vacuum breaker | Prevents back-suction of soil into emitters when system shuts off |
| End-of-line flush valve | Periodic flushing prevents biofilm buildup; usually quarterly |
Run time guidance
The math: liters needed ÷ flow rate × 60 = minutes per cycle.
| Crop / situation | Run time (typical) |
|---|---|
| Lettuce / leafy greens (dripline 0.5 GPH) | 10-20 min, daily |
| Tomato / pepper (dripline 0.5 GPH) | 20-40 min, daily; longer in heat |
| Tree (4 emitters × 1 GPH ≈ 4 GPH per tree) | 1-2 hours, 2-3× per week |
| Container plants (1 GPH per pot) | 5-15 min, 1-2× per day in heat |
| Greenhouse propagation | 2-5 min, 4-6× per day (mist + drip) |
Common mistakes
- No pressure regulator. 60 psi blows out drip tape; 25 psi is the standard. Always regulate.
- No filter. Sand, organic matter, biofilm all clog emitters within weeks without filtration.
- Lines too long. Pressure drops along length; emitters at far end deliver less. 200 ft is a typical max for 1/2" dripline.
- One zone for all crops. Tomatoes (20 min) and lettuce (10 min) on one zone overwaters one or underwaters the other. Split into zones.
- Burying tape too deep. Drip tape works better near surface; deeper than 4" loses some drainage advantage.
- Skipping the flush. Open end caps quarterly to flush biofilm and sediment.
Free under CC BY 4.0. Cite as "Open Agriculture Technology Drip Irrigation Designer (openagriculturetechnology.com)".