Zone System Audit Method (Most Accurate) - Rain Bird ESP-SMT Installation & Operation Manual

8. Determine the Efficiency Rating - Chose an
efficiency rating based on your visual observation
of system condition and operating pressure at the
nozzle from the Table below:
Poor
Sprinkler Type
Performance
Sprays 50%
55%
Rotors
55%
Rotary Nozzle
50%
Bubblers
Drip 70%
Example: Zone 1 Sprinkler Type is a Rotor and the zone
operating condition is average, so the sprinkler efficiency
value is 70% based on information in the table above.
9. Determine the Net Application Rate - The ESP-
SMT controller will automatically calculate the Net
Application Rate for the zone in which you entered
the Precipitation Rate and Efficiency.
Example: Precipitation Rate = 0.44 inches per hour
Efficiency = 70%
Net Application Rate for Zone 1 is 0.31 inch/hour
(0.44 X 70%) = 0.31 inches per hour
Average Good
Performance Performance
60% 70%
70% 80%
70% 80%
60% 70%
80% 90%

Zone System Audit Method (most accurate)

1. Place a series of catchment devices (that are the
same size & shape) throughout the area that the
zone is irrigating.
2. Turn on the zone and run for at least 10 minutes to
collect water in the catchment device.
3. The amount of water collected in each catchment
device is measured and analyzed to determine the
Distribution Uniformity (DU).
Information on how to perform an Irrigation
System Audit correctly is available on the Irrigation
Association web site at www.irrigation.org
ESP-SMT Smart Modular Control System
82