A Beginners Guide on Understanding and Using ALL THOSE ***** NUMBERS!

This isn’t making sense to me. Today zones 4-7 irrigated (back yard some shaded to shade) at 5 am, yesterday z 1-3 irrigated (front full sun).

Currently the moisture levels in the front are lower than the back, as should be because the back was just irrigated this morning. Our weather yesterday was overcast and rain, today is overcast 67 degrees.

On the calendar view it’s showing that zones 4-7 are going to irrigate again tomorrow, two days back to back? Z7 my mostly shaded area, which is 96% soil moist is going to irrigate again.

Why would the back zones irrigate back to back like this, compared to the front which is less soil moisture at the moment and gets a ton more sun?

Front yard z3 chart 58% soil moisture:

Rear yard z7 chart 96% soil moisture:

While the zone does say it will water tomorrow, the Z7 chart indicates it won’t water until at least 6/15, 3 days from now, and that seems about right.

I think I have seen the same thing, where the zone says when an upcoming watering will occur, but the chart, graph and actual operation differ. Perhaps someone else knows why they might be different?

I no longer trust the the overview of zones for seeing the days that a zone is going to water. I used to think that doing a refresh of that view would fix it, but not so. Just checked mine using the web interface (refreshed it first), and by the 3rd zone, it already isn’t right. The overview says it’s going to water on the 15th, but the moisture details says it’s going to water on the 14th. And based on observations, I trust the moisture details.

It has now updated, and all zones will water again on the Tuesday the 15th. I guess everything looks like it’s running as it should, just got to have confidence now and let it do it’s thing.

What would cause these calculations to not add up right?

They don’t add up because of excessive rain. Rain over and above resulting in a moisture value of 110% is not considered. That is, the maximum moisture can be 110%, which results in your case to 0.49" of water. Anything over that will not change it, as the rain is assumed to just run off.

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So it appears when I use local weather stations in my area, the rain precipitation is under reported compared to the local weather network. I know it was recommended to use the local weather station, but curious on why weather network wouldn’t be better? Doesn’t this use more data points (locations) to better average? Wouldn’t it gather from the local weather stations anyway?

That’s the problem, it will use an average. Unless you have an average amount of rain, it won’t be right. I’m sure you’ve seen weather forecasts where rainfall for a day varies by a factor of 2 or 3 between areas only 5 miles or so apart. You want a station that gets as close to the amount of rainfall your location gets, normally the closest one.

If it took approximately 30 mins for my sprinklers to put down a half inch of water, can I assume that my nozzle inches should be 1 inch per hour?

Yes, you can.

Soil moisture and allowed depletion are inversely proportional related.