This feature refers to the number of times per day that a selected program will be activated. This feature allows you to quickly and easily change the runtimes of all the stations on a controller to adjust for changes in the weather. By using the percentage key you can trim all the stations' runtimes without having to reprogram each one by one. This is likely over-irrigating your landscape until you remember to reprogram your controller. With non-volatile memory, the controller is not dependent upon batteries and your program is saved and reinstated when the power returns.
Most new controllers have the capability to work with rain or moisture sensors.
These sensors will shut off a station or the entire controller when it rains, and have mechanisms to reactivate the controller when the conditions are sufficiently dry. Copyright 1998 Marin Municipal Water District. All rights reserved.