Drip Irrigation for 5 Acres

What changes at five acres

Moving from two acres to five, the theme is shared infrastructure: one source, one (or a small number of) filters, one pump — serving multiple blocks that each behave like their own farm. The design quality shows up in how cleanly those blocks hang off the shared head.

• Zone structure. Typically 4–8 zones at this scale — by block, crop, and sometimes by age within a crop. Zone size is set by the pump's practical run time (a zone that irrigates in 45 minutes is manageable; one that takes 4 hours across an acre of fine emitters is a design error).
• Mainline as backbone. The mainline now runs the farm's length; it's sized for the full system flow and routed to give each block a clean take-off. Getting this right in the first design is cheap; re-routing it later is not.
• Pressure management. Over several hundred metres of mainline and between blocks at different elevations, pressure drifts. The design handles it with sizing, zone sequencing, and regulators or pressure-compensating emitters where the drift would matter.
• Head equipment as a station. Filter(s), valves, pump, and (optionally) fertigation and controls grouped where they're serviceable — on a vehicle-accessible pad, not at the edge of a flooded field.

Water source planning

Five acres of crop in the dry season is a real daily water volume, and the design checks it against the source's dry-season yield — because a borehole that yields well in March may yield half in August. Where the source can't carry the full demand, the options are: storage to bridge the deficit, splitting the farm's blocks across sources, or right-sizing the crop plan to the water. Each has a cost; the design lays them out. See water quantity and quality.

Crop blocks and specifications

Five-acre farms commonly mix: intensive vegetables (one or more blocks), a young orchard, and sometimes seedling production. Each block is specified from its crop:

• Vegetable blocks — lines per bed and emitter spacing per crop (tomatoes, cabbage, kale, onions, cucumber…)
• Orchard blocks — lines per tree by age, higher-flow emitters (avocado, mango, citrus)
• Seedling areas — fine 16mm lines, 20cm emitters, dedicated zone

The as-built document — block map, zone schedule, line specifications — is part of the delivery at this scale, because the farm will be maintained and expanded for years.

Pump, filtration and automation

The pump is sized for the largest zone set run simultaneously, at the pressure the farthest zone needs. Filtration scales with flow: at five acres, surface-water systems typically get a proper filtration arrangement (media/sand stage plus disc), and borehole systems get a disc sized to the flow with a cleaning routine that's actually doable. Automation stops being optional at this scale — a multi-zone controller running 4–8 zones is the standard operating model, with fertigation on the high-value blocks. See automated irrigation.

Maintenance at this scale

Five acres is the scale where the maintenance program becomes a line item: scheduled flushing per zone, filter checks, emitter spot-checks at line ends, pressure checks, seasonal shutdown/startup service. A system maintained on schedule runs for years; one left to habit fails in the season that matters. The maintenance service covers ongoing programs.

Cost, indicated

Complete five-acre systems are commonly in the region of KSh 400,000–900,000 in current market terms — wide, because the range spans gravity-to-solar pump options, crop mix and automation scope. The cost guide breaks down the contributors; a farm-specific scope and number come from the site assessment and quote.