I reviewed your account and used `Front Left Lawn`

as an example to attempt to explain how amounts and durations are calculated. The math behind the moisture level is a bit less straightforward as it may seem. Unfortunately we cannot use direct formula of `precip_rate * duration`

to calculate moisture level. The way flex daily determines the amount it needs to water per zone is using this formula:

`DoW = RZD * AD * AWC`

where

`DoW`

- depth of water

`RZD`

- root zone depth

`AD`

- allowed depletion

`AWC`

- available water capacity

Then we determine scheduling multiplier which accounts for nozzle efficiency and uneven zone distribution using this:

`SM = 1 / (.4 + .6 * efficiency)`

where

`SM`

- scheduling maultiplier

Then duration required to water the depth of water is calculated like the following:

`duration_minutes = 60 * DoW * RA * SM / PR`

where

`RA`

- user runtime duration adjustment

`PR`

- nozzle precip rate (in/hr)

Based on our logs there were a few updates to advanced settings to this zone in last 30 days

one on 08/28 and few on 09/17 (today). Here is the breakdown of previous and current settings

**As of 08/28**

`efficiency = 0.8`

`RZD = 4 in`

`AD = .5`

`AWC = .12`

`PR = 0.48 in/hr`

`RA = 1.50635800456472`

means that duration was increased by user in schedule settings by approx. 50% from system derived duration at some point.

Plugging those into formula gives:

`DoW = 4 * .50 * .12 = .24 in`

`SM = 1 / (.4 + .6 * .8) = 1.13636`

`duration_minutes = 60 * .24 * 1.50635800456472 * 1.13636 / .48 = 51.3524`

Which correlates with irrigation event yesterday

**Current settings**

`efficiency = 0.8`

`RZD = 6 in`

`AD = .5`

`AWC = .12`

`PR = 0.45 in/hr`

`RA = 1.50635800456472`

same as before

Gives

`DoW = 6 * .50 * .12 = .36 in`

`SM = 1 / (.4 + .6 * .8) = 1.13636`

`duration_minutes = 60 * .36 * 1.50635800456472 * 1.13636 / .45 = 82.165`

Notice that after the zone settings update the schedule will now water 82 minutes. I hope this helps understand the calculations behind flex daily durations/moisture levels. A detailed discussion on this subject can also be found in this thread Refresh my memory on the moisture chart. Please let me know if you have more questions.