University of Arizona Study Proves the Power of PRS

Date published: April, 2015


Karsten Turf Research Facility, University of Arizona

Site Type:


The Challenge:

Compare the performance characteristics of rotors and sprays with PRS technology vs. similar products without.

Performed By:

University of Arizona Department of Soil, Water and Environmental Science

The Study:

  • Eight different turf plots were evaluated (4 with PRS and 4 without) at different inlet pressure levels.

  • In each case, 10 different tests were conducted measuring precipitation rate (PR), application efficiency (AE) and distribution uniformity (DU).

  • Industry standard tests for DU included the use of “catch cans” with calculations made for low quarter distribution uniformity (DULQ) and low half distribution uniformity (DUHL).

The Results:

PRS showed marked improvements in the three key performance characteristics across the body of tests, particularly at inlet pressure levels that exceed the manufacturer recommended level.

Rain PRS Rotor Testing Results

Rain Bird PRS Spray Testing























Rain Bird PRS demonstrated improved performance, including:

  • PRS rotors reduced water use by 15-22%, depending on psi
  • PRS rotors greatly reduced misting
  • PRS sprays reduced water use by 11-14%, depending on psi
  • Distribution uniformity (DU) was improved, particularly in windy conditions

Inlet Water PSI