The Watering % Adjust is a percentage of the maximum amount of water you would apply on your landscape in July or August, when temperatures are high, rainfall is scarce and days are long. The Watering % Adjust is updated weekly using data collected from a local weather station.
Think of it this way: during a hot, dry week in July, you are watering at 100% your landscape’s maximum need. But if we get a week of foggy weather, the Watering % Adjust reflects that and tells you how to adjust your irrigation controller to prevent over watering. Over the course of the year, the Watering % Adjust changes weekly to reflect the landscape’s changing need for water as climatic conditions change. As new Watering % Adjust values are published each week, the irrigation controller’s water budget feature should be changed to match the current Watering % Adjust value
If you water with a hose or your irrigation controller does not include the “water budget adjustment” feature, then you can use the Watering % Adjust as a guideline for manually adjusting your watering duration or frequency.
The Watering % Adjust is a scientifically based guide to help people adjust watering schedules for landscape irrigation controllers (also commonly known as timers) that include a water budget adjustment feature.
This feature (either a button or a dial) permits the watering run times for all electric valves managed by a controller to be increased or decreased with just one adjustment. The adjustment is by percentage.
The Watering % Adjust represents the recommended percentage setting for the watering budget adjustment feature. The % can be close to 100% for the hottest days of of July and August. Over the course of the year the % changes to reflect the landscape’s changing need for water climatic conditions change. As new Watering % Adjust values are published weekly, the controller’s percentage adjust feature should be changed to match the current value.
Note: the Watering % Adjust does not specify that watering times should be increased or decreased by a specified number of minutes per electric valve. Instead, it simply specifies a value that the percentage adjust feature should be set at. The watering times will automatically change when the percentage adjust setting is changed.