How to Choose the Right Drip Irrigation System for Your Farm

Introduction

With over 20 years of experience supplying irrigation solutions to farms, greenhouses, nurseries, and sports areas across the UK, we know that choosing the right drip irrigation system is one of the most important decisions a grower can make. Get it right and you'll save water, reduce labour costs, and improve crop yields. Get it wrong and you'll face blocked drippers, uneven water distribution, and costly replacements.

This guide walks you through the key factors to consider when selecting a drip irrigation system for your farm.

1. Understand Your Crop and Soil Type

Different crops have very different water requirements. Row crops like vegetables and soft fruit typically benefit from in-line drip tape, while orchards and vineyards are better suited to on-line drippers with longer spacing. Sandy soils drain quickly and need more frequent, lower-volume applications, while clay soils retain moisture longer and require less frequent irrigation.

Before selecting any system, map out your field layout, soil type, and crop water demand (measured in mm/day or litres/plant/day).

2. Dripper Types Explained

There are several main dripper types to choose from:

• Pressure-compensating (PC) drippers – Deliver a consistent flow rate regardless of pressure variations across the field. Ideal for sloped terrain or long laterals. These are the gold standard for most commercial operations.
• Non-pressure-compensating drippers – Lower cost, but flow rate varies with pressure. Best suited to flat, uniform fields with short lateral runs.
• Adjustable drippers – Allow you to manually set the flow rate per plant. Useful in nurseries and pot plant production where individual plant needs vary.
• Drip tape – Thin-walled tubing with integrated emitters, ideal for row crops. Available in various emitter spacings and flow rates.

Browse our range of Rivulis Drip Irrigation and NDJ Drip Irrigation products to find the right dripper for your application.

3. Flow Rates: Getting the Numbers Right

Flow rate is measured in litres per hour (L/hr) per dripper. Common options range from 1 L/hr to 8 L/hr, with 1.1 L/hr to 2.2 L/hr being the most widely used in UK Soft Fruit & horticulture.

To calculate the flow rate you need, use this simple formula:

Required flow rate (L/hr) = Daily water requirement (L/plant) ÷ Irrigation duration (hours/day)

For example, if a tomato plant needs 3 litres per day and you irrigate for 3 hours, you need a 1 L/hr dripper. Always factor in a 10–15% buffer for system losses.

4. Pressure Requirements

Every dripper has an operating pressure range, typically between 0.5 and 4 bar. Running drippers outside this range leads to either under-irrigation (too low) or misting and damage (too high).

Key pressure considerations:

• Measure your source pressure at the pump or mains connection
• Account for pressure loss along lateral lines (typically 0.1–0.2 bar per 100m)
• Use pressure regulators at the head of each zone to maintain consistent pressure
• Install pressure gauges at key points in the system to monitor performance

5. Filtration: Don't Skip This Step

Blocked drippers are the number one cause of drip system failure. A good filtration system is non-negotiable. The mesh size required depends on your dripper's flow path — most manufacturers recommend 120–200 mesh filtration for drip systems.

Our range of Amiad Filters offers reliable disc and screen filtration solutions trusted by growers across the UK.

6. System Design Tips

• Keep lateral lengths within the manufacturer's recommended maximum to avoid pressure drop
• Use sub-main pipes to feed multiple laterals from a single header
• Zone your system so that areas with similar water requirements are irrigated together
• Consider automation with a controller and solenoid valves to maximise efficiency and reduce labour

Conclusion

Choosing the right drip irrigation system comes down to understanding your crop, soil, pressure, and flow requirements — and then matching those to the right products. With 20+ years of experience and a team of irrigation specialists, IrriSmart is here to help you design and build a system that works.

Need advice? Contact our team or browse our full range of drip irrigation products online.