DRIP AND MICRO IRRIGATION CATALOG - Ewing Irrigation

APPLICATION APPLICATION RATES RATES
The following formula should be used to calculate application rates.
Application Rate (inches per hour) =
Example:
Emitter Flow Rate = 1 gph
Spacing Between Emission Device = 18"
Spacing Between Poly Laterals = 16"
Question:
What is the application rate?
Solution:
231 x 1
Application Rate = 16 x 18 = .80"/hr
1/2 gph
Emitter
Spacing Between Poly Laterals
Spacing 12" 13" 14" 15" 16" 17" 18" 19" 20" 22" 24"
12" .80 .74 .69 .64 .60 .57 .53 .51 .48 .44 .40
18" .53 .49 .46 .43 .40 .38 .36 .34 .32 .29 .27
24" .40 .37 .34 .32 .30 .28 .26 .25 .24 .22 .20
2 gph
Emitter
Spacing Between Poly Laterals
Spacing 12" 13" 14" 15" 16" 17" 18" 19" 20" 22" 24"
12" 3.20 2.96 2.75 2.56 2.40 2.28 2.12 2.04 1.92 1.76 1.60
18" 2.14 1.98 1.84 1.72 1.60 1.50 1.42 1.36 1.28 1.16 1.06
24" 1.60 1.48 1.38 1.28 1.20 1.14 1.06 1.02 .96 .88 .80
60
231 x Emitter Flow Rates (gph)
Spacing Between Poly Laterals (inches) x Spacing Between Emission Device (inches)
A B
Poly Laterals
B
Emission Device Spacing
Emission Device
Drippers
Micro-Sprays
etc.
APPLICATION RATES (inches/hour)
Based on Nominal Flow Rates
1 gph
A
Lateral
Spacing
Emitter
Spacing Between Poly Laterals
Spacing 12" 13" 14" 15" 16" 17" 18" 19" 20" 22" 24"
12" 1.60 1.48 1.38 1.28 1.20 1.14 1.06 1.02 .96 .88 .80
18" 1.07 .99 .92 .86 .80 .75 .71 .68 .64 .58 .53
24" .80 .74 .69 .64 .60 .57 .53 .51 .48 .44 .40