I have 4 zones: flowerbed, front yard, sides, and back yard.
Flowerbed has 10, Pro-Spray Hunter nozzles, spanning 300 sqft
Sides have 11, Pro-Spray Hunter nozzles, spanning 1214 sqft.
Front yard has 5, PGP Hunter rotor head nozzles, spanning 1238 sqft
Back yard has 9, PGP Hunter rotor head nozzles, spanning 3672 sqft.
Main reason for this topic is I did a watering this morning has noticed that even those most of my backyard is flat, the last 3 to 4 feet take a dip down and back up over half a foot or so above the level yard. Somewhat hard to explain but inevitably what happens is there is an area that accumulates water that can run off from the hill.
So, I'm got all the information I need for the PR equation except B, GPM per hour. PR = (96.25 (AB))/(C), where A is #heads and C is zone square footage.
The only things I know about the nozzles are they are PGP Hunter rotor heads and Pro-Spray Hunter nozzles. The Pro-Spray heads look like the fixed spray heads in this support article: http://support.rachio.com/article/264-choosing-nozzle and naturally the rotor heads look like the rotor heads in the same support article. I can't find a part number or any part of the nozzle to know what GPM per hour number I should reference for the PR settings.
Any help would be much appreciated!!!!!