Irrigation Sprinkler Uniformity

Christiansen CU and Distribution Uniformity from catch-can readings; pass/fail at 85% and 75%.

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Formula and source

Christiansen CU = 100 × (1 − Σ|x_i − mean| / (n × mean)). Distribution Uniformity DU = 100 × mean_lowest_quarter / mean_all. Pass / fail at CU 85 / DU 75.

Christiansen 1942 paper by name; USDA NRCS National Engineering Handbook (NEH) Part 623 (Irrigation) by name.

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