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Station Avg. test
depth (in)		 Watering Time
from test		 Description of area being watered (e.g. front lawn)
example 3/8" 10 front lawn - plastic pop-up spray heads
example 1/8" 30 rear slope - impact rotors
1      
2      
3      
4      
5      
6      
7      
8      
9      
10      
11      
12      


Table A: Watering Times

Test Depth
(average depth in
15 minutes,
measured in inches)

3/4"

11/16"

5/8"

9/16"

1/2"

7/16"

3/8"

5/16"

1/4"

3/16"

1/8"

1/16"

Watering Time/Cycle
(in minutes)

5

5

61

 7

8

9

102

12

15

20

303

60

1 typical brass spray      2 typical plastic spray head     3 typical rotor head

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Table B: Watering Frequency

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Irrigation days/week 1 1 2 2 2 3 3 3 3 2 2 1
Irrigation cycles/day 2 2 2 2 2 2 2 2 2 2 2 2

Glossary

  • Station: The valve and sprinkler heads supplying water to an area of the lanscape.

  • Watering time: The number of minutes a station is set to operate.

  • Irrigation days: The days during the week that the stations are set to operate.
                             Two 10 minute cycles per day result in 20 minutes of watering per day.

  • Spray head: A sprinkler head that sprays water in a fan pattern (full or part circles).

  • Rotor head: A sprinkler head that sprays a stream(s) of water and turns while it operates.

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Notes

  • The watering times indicated in Table "A" are estimates. Your system may require slightly more or fewer minutes depending upon the way thesystem was designed. After implementing this schedule, observe the landscape. If the landscape looks evenly wet or dry, adjust the watering time for that station up or down by two minutes. If localized dry spots appear, check the irrigation system to identify the cause of the problem. (e.g. clogged nozzle on a sprinkler head)

  • Established Trees and shrubs typically require about 60% to 70% as much water as turfgrass. If your irrigation controller allows, try scheduling these areas on the controller's "Program B" and watering only two days each week in the summer months.

  • Make the trasition to this schedule slowly. Changing overnight from a 5 day per week watering schedule to a 3 day per week watering schedule can be a shock to your landscape.

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