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T E C H L I N E A S ™ D E S I G N G U I D E
Step 5: Gross Water Requirement (GWR = TWR ÷ Ef%)
Step 6: Application Rate(AR)
Step 7: Total Zone Flow (TZF = AR x Area m
Step 8: Duration of Irrigation (D = GWR ÷ TZF)
Step 9: Soil Infiltration Rate
Soil Type -
Medium
Infiltration rate –
Medium Soil –
Duration of Irrigation for this site is
17.8mm/Hr. Medium soil has an infiltration rate of
Note: If the sites soil was heavy pulsing would be required (
Divide the Duration of Irrigation
place
(2
days) to determine the duration of irrigation per day.
87 minutes ÷ 2 days = 43.5 minutes each irrigation day
These steps are designed to serve as a guide only when determining watering regimes. Other
influences may also affect water requirements such as micro climates, wind etc. Always perform
visual checks to ensure your plants are getting enough water.
Netafim Watering Calculator:
A Netafim Water Calculator can be downloaded from the Landscape section
(
http://www.netafim.com.au/index.php?sectionid=3
The calculator allows you to select relevant data from a range of pop up windows to simply and
quickly determine watering times according to your drip systems output, plant type and current
weather conditions.
NETAFIM @BCL@C40BDC65.doc
GWR = 4,920 ÷ 95%
GWR = 5,178 Litres per week
Refer AR Table – 1.6L/H x 0.3m x0.3m
AR = 17.8mm/Hr
2
TZF = 17.8mm x 200m
TZF = 3560 Litres per hour
D = 5,178L ÷ 3560L
D = 1.45 Hrs per week
(1.45Hrs x 60 = 87 minutes per week)
40mm/Hr
2 waterings per week (or current watering restrictions)
87 minutes
(87
minutes) by the number of days watering should/can take
21/12/2009
)
2
and the application rate of the system is
40mm/Hr
so wont require any pulse irrigating.
approx. 6 x 15 minute
)of the Netafim Australia website.
34
cycles).
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