If you are using our Flexible daily scheduling, the approach we take is much more sophisticated. We track moisture levels on a daily basis, only watering when your zone is depleted, or empty.
With flex daily schedules the watering duration, or watering amount never changes, just watering frequency. By filling up your zone bucket and waiting to water until its fully depleted, this promotes root growth, reduces watering frequency and results in a healthier, more drought tolerant landscape. We allow changing duration by percentages from 50% to 150% of the duration we derive from crop type, nozzle type, etc. I wouldn't focus on the percent, just that the watering minutes are generally what you want.
I would start with close to the same duration you have used in the past just as a baseline and see how flex daily behaves. You can easily see how it will water by just looking at each zone's soil moisture graphs (available when zones are in a flex schedule). If the system is watering too frequently, or too infrequently, we can help you dial that in. There are some great community members that love to help as well. After things are running smoothly, you can always adjust down the minutes and see how your lawn reacts. I know this is a lot to get used to, but the end results will be worth it
This is a good, short article on the general concepts of flex schedules.
This has an overview of all the flex scheduling resources.
If you are looking for something a bit more predictable, flexible monthly schedules adjust frequency each month, tracking historical weather data.
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