How do I calculate irrigation demand?
Planning-level irrigation demand combines reference evapotranspiration for the site, a crop coefficient for the growth stage, the irrigated area and the application efficiency of the system. The result is a peak daily volume, which is then converted into a design flow using the hours the system may operate.
Where this sits in greenhouse irrigation system procurement
A greenhouse irrigation system is specified from crop water demand, growing system, water source quality and block layout — those four inputs decide pump duty, filtration, mainline sizing and emitter choice before any supplier is approached.
Typical procurement searches this answers: greenhouse irrigation system · greenhouse drip irrigation design · irrigation system for hydroponic greenhouse · greenhouse water requirement per hectare
Inputs that change the answer
- Reference ET (mm/day) at peak
- Crop coefficient by stage
- Irrigated area
- System application efficiency
- Available irrigation window (hours/day)
What this answer does not settle
Planning volumes are not a hydraulic design; leaching fraction, salinity and drainage strategy must be set by an agronomist and irrigation designer.
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More in Irrigation design inputs
Related greenhouse irrigation system answers
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- How much does the crop change the greenhouse specification?
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