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How do I use the
Watering Minutes Table?
First determine your sprinkler application
rate. Use the specifications manual for your sprinkler system.
Or you may manually calculate the rate. The average sprinkler
rate is 1 inch per hour. Your irrigation system specification
should tell you what pressure to run the system and the resultant
application rate.
If you have your sprinkler application rate
and it is more or less than 1” per hour, use the Watering
Minutes by Application Flow Rate Table (below) to determine
irrigation time in minutes.
You have determined that your sprinkler application rate is
0.75”/hour. The Daily
ET Index for today
Saturday, October 1, 2011
is 0.50 inches, which tells you to irrigate for 30 minutes.
With your lower sprinkler application rate, you should water
your lawn for 40 minutes.
Watering Minutes
by Application Flow Rate
ET
Index |
0.25/hr |
0.50/hr |
0.75/hr |
1.00/hr |
1.25/hr |
1.50/hr |
1.75/hr |
2.00/hr |
Watering Minutes |
Watering
Minutes |
Watering Minutes |
Watering
Minutes |
Watering Minutes |
Watering
Minutes |
Watering Minutes |
Watering
Minutes |
0.00" |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0.25" |
60 |
30 |
20 |
15 |
10 |
10 |
10 |
10 |
0.50" |
120 |
60 |
40 |
30 |
25 |
20 |
20 |
15 |
0.75" |
180 |
90 |
60 |
45 |
40 |
30 |
30 |
20 |
1.00" |
240 |
120 |
80 |
60 |
50 |
40 |
30 |
30 |
1.25" |
300 |
150 |
100 |
75 |
60 |
50 |
40 |
40 |
1.50" |
360 |
180 |
125 |
90 |
70 |
60 |
50 |
45 |
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