Adding it all up for turf
For turf (grass), you should apply about .75" (¾ inch) of water each time you irrigate to wet the root zone (a soil depth of 6 to 10 inches). The first table below shows how long to run your sprinkler system. For example, if your sprinkler number is .3 inches you would need to run the system for 37 minutes.
| Table A: run time of sprinklers to apply .75" with each irrigation |
| Average can measurement (inches) |
.1 |
.2 |
.3 |
.4 |
.5 |
.6 |
.7 |
.8 |
| Minutes to run sprinklers |
112 |
56 |
37 |
28 |
22 |
18 |
16 |
14 |
The table below offers a monthly schedule based on historical weather information, and works well for warm season grasses such as bermuda and cool season grasses such as winter rye.
| Table B: monthly frequency (days between watering) for warm and cool season grasses |
| |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
| Bermuda |
30 |
21 |
14 |
7 |
4 |
3 |
3 |
4 |
4 |
6 |
14 |
30 |
| Rye |
14 |
10 |
7 |
4 |
3 |
- grass dies out - |
3 |
10 |
14 |
