For best results, spend a bit of time on the precipitation rate. It will get you the best watering.
Then, when you plug in the area, it will also give you good Gallons usage reports. Until you have both correct, the gallons report is meaningless.
For better or worse, what I did is -
- Measure the gallons per minute at the meter. I ran each cycle for 3 minutes, then divided each by 3 to get a GPM per zone.
- Measure the zone that is being watered
- Calculated the Precipitation Rate: Precipitation Rate = (96.25 * GPM ) / Area
(Area is in sq ft)
- Created a new sprinkler head for the calculated Precip rate (in cases where they came out close, I used the same Pr and slightly adjusted the area so the gallons would be correct.
To me, getting the gallons used was most important because I want to compare to my water bills.
I measured my zone areas using this: http://www.mapdevelopers.com/area_finder.php