# Cant lower water duration below 50%

Hi folks,

I’ve noticed that my front long and back lawn are getting a little too much water and I was looking at ways to reduce.

I went into the app here:

and tried to reduce the duration below 50% but I was unable to. (just in case that doesnt embed, here’s the direct link: https://cl.ly/1J0G3j0w0K0R)

Here’s a quick little GIF of me trying to edit but being unsuccessful:

: (just in case this doesnt embed, here’s the direct link: https://cl.ly/1J1H0O3F0g0m)

Anything else I can do to reduce the amount of water?

You can adjust your sprinkler head settings, specifically you can create a custom nozzle for the zone(s) with a higher precip(itation) rate. This will cause Rachio to water for less time.

That will throw off your water usage calculations.

Zone area can be adjusted to “recalibrate” usage estimates.

For example, if you find that your actual usage (as per water meter) is 40% more than reported, than the area for that zone needs to be increased by 60% (100% - 40%), in other words the final area needs to be 40% greater than initial area.

Alternatively if your actual usage is 40% less than reported, than area needs to be reduced by 40%.

Formula for this can be:

Final zone area = initial zone area / (estimated water usage / actual water usage)
or in other words
Final zone area = (initial zone area * actual water usage) / estimated water usage

P.S. by “usage” I mean change in reported gallons, long form of this formula may be:
final zone area = (initial zone area * (actual meter reading after the test - actual meter reading before the test)) / (estimated water usage after the test - estimated water usage before the test)

P.P.S. Duration of the test does not matter, but the longer you run the zone during the test, the better estimate will be. I’d recommend to run the test for at least 5 minutes. Calculations / adjustments need to be done separately for each zone.

But you need to adjust BOTH the precip rate AND the sq footage appropriately. You would lower the sq footage to make the system think it’s watering a smaller area, hence using less water, but also calculate and adjust the precip rate to keep the water usage calculated properly. What ever % that you reduce the sq ft by, the same % needs to be added to the flow rate to keep the water calculations correct.

This might be an easier fix:

Crop coefficient (this does NOT affect flex schedules created before 5/19/2016)
Decreasing crop coefficient decreases watering frequency

Available water
Decreasing reduces run time

Root depth
Decreasing reduces run time