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Weather-Based
Landscape Irrigation
(ET Controllers)
What is an ET controller?
An ET controller automatically adjusts the amount of water applied to your landscape based on weather conditions. The "smart" ET controller receives radio, pager or internet signals with evapo-transpiration information, to replace only the moisture
your landscape has lost to heat, humidity and wind. Other controllers use historical data to adjust the watering program.
Why are ET controllers becoming popular?
Standard irrigation controllers require users to calculate complex irrigation schedules and adjust run-times with changing weather conditions. A “smart” ET controller can determine adjustments to the watering schedule based on weather conditions... and it can do so without human interaction.
Where can I find more information on ET controllers?
When considering an ET controller, you should know:
- You still need to determine an appropriate schedule for each zone, just as you would for a standard irrigation controller. See our tips on scheduling your irrigation system (pdf).
- You may not save water. You can only save water if you wasted it before. ET controllers are no guarantee of water savings, and savings will vary based on landscape type and the efficiency of your equipment.
- You can't "set it and forget it." Your controller may still need updates and monitoring.
- It's not a "forever" solution. Leaks, stuck valves, under- and over-watering, and other landscape problems can happen with any type of irrigation system.
- Most have monthly fees. Costs will vary with controller manufacturer and services.
How can I use ET amounts with my current system?
Read the ET instructions here.
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