Irrigation Zone Runtime and Cycle-and-Soak
The controller runtime to apply a target depth: net (depth / rate x 60), gross (net / distribution uniformity, so the dry quarter gets the target), and a cycle-and-soak split into runs short enough to beat runoff on the soil and slope. The DU comes from a catch-can audit and the soil caps the cycle length; a program aid, not a guaranteed schedule.
Formula and source
net_min = target_in / precip_in_hr x 60; gross_min = net_min / du; cycles = ceil(gross_min / max_cycle_min); per_cycle_min = gross_min / cycles.
First-principles runtime and cycle-and-soak relations with the Irrigation Association scheduling references (by name); no edition cycle.
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