NETAFIM USA Landscape & Turf Product Catalog | 63 Number of Emitters in a Zone = Total Dripline x 12 Emitter Spacing (inches) Note: Evapotranspiration rates for your geographic location can be found by searching the internet for local weather stations, from weather data services, from on-site weather collection devices, or from Historical Et data. If you are not irrigating daily, the Daily Et should be multiplied by the number of days since your prior irrigation cycle in order to replace the total Et since your previous irrigation cycle. If the Estimated Run Time is long enough to create water run-off, the total run time should be broken into multiple irrigation cycles. Cycle run time should not generate water run-off. DRIPLINE CALCULATIONS In Which: Estimated Total Length of Dripline = Total Footage of Dripline in a Zone Irrigated Area = Total Area in Square Feet Minimum Recommended Lateral (Row) Spacing = The minimum row spacing from the General Guidelines Chart in inches FORMULA 1.1 Estimated Total Length of Dripline = Irrigated Area x 12 Minimum Recommended Lateral Spacing (inches) In Which: Application Rate is = Inches per Hour of Water Being Applied Emitter Flow Rate = Gallons per Hour Flow of One Emitter Emitter Spacing = Spacing in Inches of Emitters Inside Tubing Dripline Row Spacing = Inches Between Techline Laterals (rows) FORMULA 1.2 Application Rate = 231.1 x Emitter Flow Rate (GPH) Dripline Row Spacing (inches) x Emitter Spacing (inches) In Which: Number of Emitters = Number of Emitters Total Dripline = Length of All Dripline in a Zone in Feet Emitter Spacing = Spacing in Inches of Emitters Inside Tubing FORMULA 1.3 In Which: Flow Per Zone = Total Gallons per Minute Number of Emitters = Number of Emitters Emitter Flow Rate = Gallons per Hour of One Emitter FORMULA 1.4 Flow per Zone = Number of Emitters x Emitter Flow Rate (GPM) 60 In Which: Estimated Total Zone Flow = Gallons per Minute in Zone Irrigated Area = Total Area in Square Feet Emitter Spacing = Spacing in Inches of Emitters Inside Tubing Dripline Row Spacing = Inches Between Techline Laterals (rows) Emitter Flow Rate = Gallons per Hour of One Emitter FORMULA 1.5 Estimated Total Zone Flow = Irrigated Area x 144 Emitter Spacing (inches) x Dripline Row Spacing (inches) { } In Which: Estimated Run Time = Estimated Number of minutes of run time for a particular zone (based upon input data) Et = Evapotranspiration; The amount of water released from soil by evaporation and transpiration from plants. Daily Et = Monthly Et divided by the number of days in the associated month. Application Rate = Inches per hour of water being applied. This can be calculated by using Formula 1.2 or by referencing the Application Rate Charts on page 7. 60 minutes = Conversion factor from hours to minutes (60 minutes in one hour). FORMULA 1.6 Estimated Run Time = Daily Et (inches) Application Rate (inches per hour)

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