Hunt Irrigation: The Smart Water Company

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# PRS Advantage

## 4 Easy Steps to Water Savings

**Estimated Water Savings Analysis for a Rain Bird 1800-PRS Upgrade**

Rain Bird’s patented 1800 PRS in-stem pressure regulator ensures maximum spray head and nozzle performance, even with varying inlet pressures. By maintaining constant optimum pressure of 30 psi at the nozzle, 1800 PRS spray heads end misting and fogging caused by high pressures. For you that means water savings. Enter the information from your system below and see how much water you can save!

#### See How This Formula was Derived

#### PRS Formula Details

The Values in this chart were derived from Bernouli’s equation (5.19). Please refer to *Roberson/Crowe, Engineering Fluid Mechanics (Fourth Edition), Houghton Mifflin Company, Boston MA, 1990.*

In the chart to the left, Bernoulli’s equation was utilized to calculate the potential Water Savings Multiplier. This Multiplier represents the fraction of water that could be saved by operating standard spray heads at 30 psi.

Bernoulli’s equation is used in engineering to predict fluid pressures within a body (for example, water pressures in an operating spray head). As these pressures change within a spray head, the spray pattern changes, resulting in less efficient utilization of the water flowing through the spray head.