Drip Irrigation

Drip irrigation delivers water exactly where plants need it, in small steady amounts, with essentially no evaporation loss. The system is a pressurized backbone (often a half-inch poly tube) feeding smaller distribution lines that carry emitters at each plant or every few inches along a row.

Why it matters

• Water savings of 30–50% compared to overhead sprinklers — most overhead water evaporates, runs off, or wets paths and weed surfaces
• Reduced disease pressure — leaves stay dry; many foliar diseases (powdery mildew, septoria, late blight) depend on wet leaf surfaces
• Precise placement — each plant gets a known amount; thirsty crops get more emitters, drought-tolerant crops fewer
• Compatible with mulch — water goes under the mulch; mulch doesn’t get in the way
• Compatible with row cover and low tunnels — the drip line runs underneath the cover

Components

• Backbone tubing — 1/2-inch polyethylene; runs from the water source along the main garden axis
• Distribution lines — 1/4-inch tubing branches off the backbone to individual beds
• Emitters — small fittings that drip water at fixed flow rates (0.5, 1.0, 2.0 GPH most common)
• Or drip tape — flat tubing with built-in emitters at fixed intervals (4, 8, 12 inches typically); cheaper, more compact, season-disposable
• Pressure regulator — drip systems run at low pressure (10–25 PSI); house water pressure must be stepped down
• Filter — sediment will clog emitters; a 150-mesh filter is the minimum
• Backflow preventer — keeps garden water from siphoning back into household supply
• Timer — automatic, battery- or AC-powered, makes the system manageable

Total cost for a typical home-garden setup: $80–$300 depending on garden size and component quality.

Drip tape vs. emitters

• Drip tape — best for row crops in beds; cheap (~$0.05 per linear foot); replace each season or two
• Discrete emitters on poly tubing — best for individual plants spaced irregularly (perennials, mixed beds, container plantings); more durable, more flexible, more expensive per plant

Most serious home gardens use both: drip tape for vegetable beds, emitters for perennials and containers.

Scheduling

• Frequency: typically every 1–3 days in season, less in cool weather; system runs 30–90 minutes per cycle
• Volume: most vegetable crops want 1–2 inches of water per week; drip systems are sized to deliver that across the runs
• Adjustment by crop and season — tomatoes after fruit set need more; established perennials less; reduce dramatically in cool/wet weather

A note on the history

Modern drip irrigation was invented in Israel in the 1950s — engineer Simcha Blass noticed a tree near a leaking pipe was growing dramatically larger than its neighbors. The kibbutz Hatzerim partnered with Blass in 1965 to commercialize the technology; their company Netafim is now the global leader. The technology has been one of the major water-efficiency advances of the 20th century in arid agriculture worldwide.

See also

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• Subset of: [[gardening]]
• Shares approach with: [[ollas]]
• Member of: [[practice]]

Sources

• Drip Irrigation Handbook, Netafim technical documentation
• David Bainbridge, Gardening with Less Water (Storey, 2015)
• USDA NRCS irrigation technical references

Rooted in life.