@hbreese - my guess is this is what is installed http://www.rainbird.com/landscape/products/dripline/XFS.htm.
See -> Drip Emitter Calculator for Precipitation Rate & Area or https://support.rachio.com/hc/en-us/articles/115010540608-Precipitation-Rate-Calculator or https://support.rachio.com/hc/en-us/articles/115010542168-How-do-I-create-a-custom-nozzle-