Estimate flow capacity per zone using measured available flow and manufacturer nozzle requirements.
How this calculator works
Heads per zone = floor(available flow × (1 − reserve ÷ 100) ÷ nozzle flow). Zones = ceiling(total heads ÷ heads per zone). Measure available flow at the required operating pressure; an unrestricted bucket test and static pressure alone do not establish simultaneous capacity. This calculation assumes identical nozzles and sequential zones. Pipe friction, elevation, valves, backflow devices, head-to-head coverage and matched precipitation still require design checks. Pressure below the stated nozzle requirement produces no capacity recommendation.
Units and inputs
Use measured inputs and replace the demonstration values. 1 ft = 0.3048 m; 1 sq ft = 0.09290304 m²; 1 inch = 25.4 mm; 1 US gallon = 3.785411784 litres. All entered prices must use the same currency. Zero prices omit the optional budget.
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