Report: Retrofitting with Rain Bird® PRS

23% Savings

Date published: May, 2013


Canyon Creek Townhomes, College Station, Texas

Site Type:



Measure performance of an installed irrigation system, both before and after replacement of existing sprinklers with Rain Bird PRS sprinklers.

Performed By:

Charles Swanson - Texas A&M Agrilife Extension Service, and David Hebert of Texas Lawn Care


  • A catch can test of the irrigation was implemented. Water meter readings were also recorded in order to determine potential water savings. Wind speed was recorded with an anomemometer and sprinkler pressure was measured with a pitot tube.
  • The captured data was evaluated using two standard irrigation efficiency test methods: Distribution Uniformity (DU) and Coefficient of Uniformity (CU). These methods are used to statistically determine the ability of an irrigation system to distribute water evenly.


Test Precipitation Rate, in/hr DULQ CU Scheduling Multiplier Water Use, GPM Test Runtime, Minutes
1. Existing Rotor 0.27 52% 63% 1.40 9.53 15
2. Existing Rotor 0.23 44% 56% 1.51 9.87 15
1. Rain Bird PRS 0.20 65% 77% 1.27 7.33 15
2. Rain Bird PRS 0.25 67% 76% 1.25 7.33 15


After retrofitting with Rain Bird PRS:

  • Distribution Uniformity (DU) increased from 44-52% to 65-67%
  • Coefficient of Uniformity (CU) increased from 56-63% to 76-77%
  • Reduced water use by 23%
  • Simliar precipitation rates (the rate of water distributed) were maintained