Drip Zone Flow and Valve Capacity
The total emitter flow on a drip zone (gph and gpm) and its utilization against the valve / lateral flow limit, with the emitter count given directly (point-source) or derived from dripline length and emitter spacing (inline). Keep utilization under 100% or the far emitters starve; a flow-budget check, not a hydraulic pressure-loss model.
Formula and source
inline emitters = floor(tubing_ft x 12 / spacing_in); zone_gph = emitters x emitter_gph; zone_gpm = zone_gph / 60; utilization = zone_gpm / valve_gpm x 100.
First-principles total-flow and utilization relations with the Irrigation Association low-volume references and the major-manufacturer drip design data (by name); no edition cycle.
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