Forecasted Values/Rain Fall/Forecast Correction: When is AW reset?
Hello Guys,
So I am still confused about how the systems calculates the AW for the next run. I have forecast correction turned on.
Example:
Forecast: .87 inches of rain
Weather Sensitivity: 85%
Forecast Correction: Enabled, using weather station (used Real Rainfall)
Actual Available Water (before simulated runs): 0 (has not rained in a week)
It did the calcs right and gave 10.54 mm of forecasted AW which seems correct for the expected rainfall amount.
Question: If it does not rain any, will the AW then be reset to the previous value or will it continue using this calculated value for the AW on the next simulation run? will the the rainfall be negative at the end of the day since it did not rain? When does the AW reset?
Question 2: Since the system was suppose to water, and did not water due to it thinking it would rain, when will that water that was "missed" be put back into the system to be put on the grass?
With being in Houston during the summer, the forecast is hit or miss with the sea breeze and random pop up showers. So I could mess with the sensitivity but then we might be over watering but guess that is just the way it is.
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H Kenny,
AW is not "reset", it's used on next watering. AW only exists if after a rain the EvapoTranspiration is less than the QPF/Rain amount.
To actually "reset" AW, you will need to remove the program as AW is kept per program per zone. In the next release we will also have a UI to reset AW.
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Still a bit confused but think i figured it out while typing this.
-example: the system was suppose to water this morning and .85 inches of rain were forecasted, so it calculated that there was 10.4 mm of AW (when that rain hasn't happened yet). So now if that rain didn't come, would it continue to pass that value (mines et) to the next simulation?
Since i'm using actual rainfall to drive my system (weather station) then the system will adjust the AW downward since the rain didn't happen?
Then i guess that is where the weather sensitivity comes into play. due to the forecast is not always 100% accurate then we still could have days where the system thinks it rained and increased the AW but it really didn't rain, so that AW is basically a false positive and i would need to reset the AW?
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Yes if you have a weather service that retrieves actual measured rain, the system will correct on next watering if the previous watering was bad (needs to have Forecast Corrections enabled).
Also AW can be bigger than Field Capacity as we allow some surface accumulation depending on slope.
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