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"Efficiency" setting

#1

In a recent post a contributor made the following statement:
“A quick observation - Your efficiency is listed as 80% - that simply is not possible with sprinklers.”

Since 80% is the default that Rachio sets for fixed head sprinklers I wanted to solicit opinions (both Rachio and others) about what an appropriate efficiency setting might be?

#2

From http://www.allianceforwaterefficiency.org/Drip_and_Micro-Spray_Irrigation_Introduction.aspx

"The efficiency of overhead irrigation, such as rotors, and pop-up sprayheads is typically 50 percent and rarely exceeds 70 percent. "