How to Choose a Drip Irrigation System

The sequence — the order that matters

The four questions, in the order they decide the design. The assessment is the visit where the farm's own numbers answer them; this guide is the method, so the farm's answers land in the right places.

1. The source — the constraint

The water is the constraint, and it's the first question. The water quality & quantity guide is the assessment: the dry-season yield (the number the design is built on), the quality (the filtration spec), the position (the gravity or the pump), the storage (the gap's carrier). The source's answer decides:

• The delivery — the gravity (the head's 0.1 bar per metre), the pump (the flow and the lift), or the two together. The design guide walks the calculation.
• The filtration — the disc on the borehole, the sand/media + disc on the surface water, the two-stage on the demanding lake intake. The filtration guide has the matching.
• The scale's limit — the zone's count (the pump's practical run time), the field's size (the source's yield against the crop's peak). The design guide has the zone sizing.

2. The crop — the demand

The crop's spacing and demand set the line spec — the tape or the line, the emitter spacing and the flow, the lines per bed or per tree. The crop pages have the per-crop specs; the table is the quick reference:

The crop's answer decides: the line type (the tape for the turned-field, the line for the standing block), the emitter spec (the spacing from the plant spacing, the flow from the demand), the fertigation (the long-cycle, the high-value crops that earn it), and the schedule (the run time and the frequency, the drip guide's method).

3. The soil — the schedule's variable

The soil type sets the schedule's character — the run time and the frequency, the water's movement through the ground. The practical read:

• The sandy soil. The water moves through it fast — the runs are shorter and more frequent, the emitter flow on the higher side (the watermelon block on the dryland's sandy ground is the pattern). The water quality guide notes the soil's role in the quantity's read.
• The heavy / the clay soil. The water moves through it slow — the runs are longer and less frequent, and the over-watering risk is the root-rot story (the avocado's waterlogging line, the citrus's mandarin sensitivity). The dry-side bias is the scheduling rule.
• The volcanic red soil. The well-draining highland ground (the Murang'a, the Nyeri highlands) — the runs on the shorter, more frequent side, the drip guide's method.

The soil's answer decides the schedule (the run time, the frequency), the emitter flow (the higher side on the sandy, the lower on the heavy), and the automation's role (the soil-moisture sensor's case is strongest on the variable soil, the automation guide notes the pattern).

4. The scale — the economics

The scale sets the system's architecture — the zone's count, the head's spec, the automation's level, the maintenance's model. The practical read:

• The smallholder (the ¼–2 acre). The compact head (the small filter, the valve or two, the pump or the gravity), the single or the few zones, the timer or the small controller, the smallholder guide is the pattern. The cost guide has the indicative ranges.
• The mid-block (the 2–5 acre). The zone structure (the 3–6 zones, the pump's practical run time), the head station (the filtration, the valves, the gauges), the controller (the multi-zone), the commercial guide is the pattern at the smaller end.
• The commercial (the 5+ acre). The zone's architecture (the 4–8+ zones, the block map), the head station (the filtration station, the gauges, the fertigation head), the automation (the controller, the solenoids, the sensors), the maintenance as the standing arrangement. The commercial guide is the pattern.

The specification — the sequence's output

The four questions' answers are the system's specification — the document that the design writes and the install builds. The specification's lines, from the sequence:

• The delivery — the gravity or the pump (the source's position, the water quantity's head).
• The filtration — the filter type and the routine (the source's quality, the filtration guide).
• The line spec — the tape or the line, the emitter spacing and flow, the lines per bed or tree (the crop's demand, the crop pages).
• The zone structure — the zone's count and the block map (the pump's practical run time, the design guide).
• The schedule — the run time and the frequency, per zone (the soil's character, the crop's stage, the drip guide).
• The automation — the timer or the controller, the solenoids, the sensors (the scale's labour economics, the automation guide).
• The fertigation — the tanks, the injection point, the program (the crop's feed, the fertigation guide).
• The maintenance — the calendar, the routine (the system's life, the maintenance guide).

The assessment is the visit where the farm's own numbers answer the four questions; the design is the specification written from them; the quote is the specification with a price. The sequence is the method; the numbers are the farm's.

What "choosing" is not

Choosing a drip system is not choosing a kit against a budget — the kit chosen against the price is the system that fails on the axis the price didn't cover (the line spec set by the shop counter, the filter sized for the line instead of the source, the pump labelled for the acreage). The sequence is the method that prevents the compromise: the source first (the constraint), the crop second (the demand), the soil third (the schedule), the scale fourth (the economics). The how drip works guide is the system's mechanics; this guide is the choice's method. The cost guide is the price's picture, built from the specification's lines.