How is irrigation application efficiency calculated?

Ea = (Ws / Wa) × 100%, where Ws is water stored in the root zone (beneficial use) and Wa is water applied. Ea = (ETc × A) / (Q × t), where ETc is daily crop ET (mm), A is irrigated area (m²), Q is flow rate (m³/hr), and t is irrigation duration (hr). Typical Ea values: surface drip 90–95%, subsurface drip 95%, sprinkler 75–85%, furrow 40–60%.

What is distribution uniformity (DU) and how is it measured?

DU (Lowhead) = q_25 / q_avg × 100%, where q_25 is the average of the lowest quartile catch can measurements. DU > 80% is good for sprinklers; DU > 85% for drip. Field measurement per ASABE S436.1 (sprinklers) or ASABE S526.4 (drip) involves catch-can tests on a grid pattern throughout the irrigation zone.

Irrigation System Efficiency Calculator

Calculate irrigation application efficiency, distribution uniformity, and water use efficiency for different irrigation system types.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the patient or scenario you are assessing. Calculate irrigation application efficiency, distribution uniformity, and water use efficiency for different irrigation system types. Use the irrigation efficiency result to inform your clinical assessment.

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Frequently Asked Questions

How is irrigation application efficiency calculated?

What is distribution uniformity (DU) and how is it measured?