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BASIC INFORMATION NEEDED BEFORE
CALLING FOR DRIP IRRIGATION SYSTEM
Approximate Acres To Irrigate?
How Many Rows? How Long?
Type Of Water Source?.........
Well........River.........
Pond
.........
City Water
How Far Is The Water Source From the Field?
Approx. how many feet of elevation from the water source to the field?
If you have your own pump, how many G.P.M.? At what PSI.
Need to do all of your field at one time? Or break into zones?
(A small water source may determine the amount of zones)
TEST INFORMATION
Determining amount of water in a well? 1. Check inside of your well cap. 2. Ask your well driller. 3. Check it
yourself, put a pressure gauge and valve next to your hydrant, close the valve to approx. 30 PSI, use a 5 gal. pail
or barrel and check fill time with your watch. Note; Your well may have a small water pump and a large amount
of water, if so, a larger pump may be used. To check an engine pump, pressurize pump to approximately 50 PSI
and check with barrel and your watch.
How much water do I need for my irrigation system?
See charts inside of back cover. (GPM per acre)
Standard drip tape has 12” emitter spacing and flow rate is .45 GPM per 100 ft. at 8 PSI. Can be used for
rows up to 500 ft. long. For longer rows up to 1000 ft. lower flow drip tape must be used or a larger diameter
drip tape. To find flow (GPM) needed for a field or zone, multiply total linear ft. of drip tape x drip tape flow rate.
Example; total linear ft. of drip tape 12,561 ft. ÷ 100 (for the flow rate per 100 ft.) x flow rate .45 = 56.5 GPM.
PLEASE CALL FOR MORE INFORMATION
Square feet per acre = 43,560 sq. ft.
1 Acre = 208.71 ft. sq.
1” an Acre = 6,500-13,500 Gallons (Drip irrigation depending on row spacing)
1” an Acre = 27,154 Gallons (Overhead Irrigation)
1” per hour an acre = 452.57 GPM (Overhead Irrigation)
h
elPful
t
iPs
*2.31’ of gravity is needed to create 1 PSI.
*1 Cubic foot of water equals 7.48 gallons.
*Inches per hour= .00221 x GPM flow ÷ acres.
*.38 Liter = 1 Gallon
CLIMATIC
CONDITIONS
DURING CROP
Suggested
Average
Acre inches
per day
Cool & Humid
Warm - Semi-Humid
Warm - Dry
Very Dry - Hot
Very Dry - Hot Winds
G. P.M. PER ACRE
Daily Pump Operation
2 4 6 8 10 12 16 20 24
Hrs. Hrs. Hrs. Hrs. Hrs. Hrs. Hrs. Hrs. Hrs.
.20
45.3 22.6 15.1 11.3 9.1 7.5 5.7 4.5 3.8
.25
56.6 28.3 18.9 14.1 11.3 9.4 7.1 5.7 4.7
.30
67.9 33.9 22.6 17.0 13.6 11.3 8.5 6.8 5.7
.35
79.2 39.6 26.4 19.8 15.8 13.2 9.9 7.9 6.6
.40
90.5 45.3 30.2 22.6 18.1 15.1 11.3 9.1 7.5
NOTE; Chart based on 7 Day per week operation.
For 6 day pump operation multiply G. P. M. per acre by 1.166
For 5 day pump operation multiply G. P. M. per acre by 1.4
Row Spacing
Plastic
(I
NcHeS
)
F
eet
P
er
a
cre
48”................10,890’
52”................10,052’
56”..................9,334’
58”..................9,012’
60”..................8,712’
62”..................8,431’
64”..................8,168’
66”..................7,920’
68”..................7,687’
70”..................7,467’
72”..................7,260’
76”..................6,876’
80”..................6,534’
84”..................6,223’
88”..................5,940’
Drip Information
