I’ve come across two of what I call discrepancies, or at least areas (2 of many) that I don’t understand about the Rachio results. In trying to understand operation of the Flex Daily system better, and to be able to fine-tune it to my needs, I’ve found:

Using 70% sprinkler head efficiency, 0.5 “/hr nozzle rate and the constant (in these examples) of my Test Zone, Rachio calculates watering 122 minutes resulting in an application of 0.84” of water to my zone. For this given Test Zone, Rachio will ALWAYS calculate 0.84" of water, applied about every 4 days.

Fine. Now, if I change the nozzle rate to 1"/hr, Rachio calculates 61 minutes of watering, giving the same 0.84" of water. Exactly half the time, for twice the flow, same water output. Excellent!

Finally, if I change the nozzle rate to 0.25"/hr, Rachio calculates 180 minutes of water, giving 0.84" of water. Whoops! With half the flow, to give the same amount of water, the time should be twice what it was for 0.5", or 224 minutes. But it’s not. That, I think, is a problem. Can someone explain it.

Similarly, with a constant 0.5" flow, and producing the same 0.84" of water, I get these times for 3 different efficiencies:

50% - 143 minutes

70% - 122 minutes

100% - 100 minutes

With half the efficiency, to get the same amount of water, the time should be doubled. But it’s not, it’s only increased by 43%. (About the square root of 2 = 1.414) Again, is the correct? It doesn’t sound right. Remember, the ONLY thing being changed here is the nozzle flow rate and efficiency. Rachio calculates the same 0.84" of water will be applied in all cases. How can that be?