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Technical Insights

An irrigation project brief: which data, at what level of confidence

A sound irrigation project depends on separating what has been measured from what has been assumed, from the very first conversation.

AGIMEX Engineering TeamPublished: Updated:

The calculation starts with crop water demand

Irrigation design begins with the water a crop requires in a given period, not with equipment. The common approach is to derive reference evapotranspiration (ET₀) from climate data and adjust it with the crop coefficient (Kc); growth stage, canopy cover and local climate all shape that adjustment. Skipping this step and moving straight to pipe diameters and dripper selection embeds a capacity error that is expensive to correct later.

Source capacity and operating window are read together

Available flow alone is not enough information. Real capacity emerges only when daily usable operating hours, power interruptions, well recovery needs and seasonal decline are considered together. The same area calls for a different system where twelve hours a day are available than where six are.

Measured and assumed values are kept apart

Every figure in a project brief should carry its origin: a laboratory report, an operating record, or an estimate. When that distinction is lost, estimates quietly become data and the design rests on false precision. It also sets the priority for the site survey — the weakest assumption should be the first one verified.

Missing information is recorded as a reasoned range

Some data will always be unavailable at the outset. The right approach is to fill those gaps with a reasoned range, record the range itself, and then show how much that range changes the design. This makes visible which measurements genuinely matter and which would not alter the outcome.

How the information you have enters the design
Information you haveHow it enters the design
Crop, growth stage and location knownET₀ is derived from climate data and adjusted with the crop coefficient (Kc); growth stage, canopy cover and local climate shape that adjustment
Source flow measuredFlow alone is not enough: daily usable operating hours, power interruptions, well recovery needs and seasonal decline are considered together
Short daily operating windowThe same area calls for a different system than where twelve hours a day are available; operating hours are a design input
Value from a laboratory report or an operating recordRecorded with its origin as a measured value
Value is an estimateMarked as an assumption; the weakest assumption is the first one verified in the site survey
No information yetRecorded as a reasoned range; the design shows how much that range changes the outcome

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