Hunter Technical Support Document
ET Site Information Overview
To simplify setting up a Hunter ET System we've highlighted some of the more complex choices.
Note: The ET Module dial must be left in the Automatic position, or the ET program will not irrigate! If the ET System is watering, moving the dial from the Automatic position will cause it to stop.
At the Plant Type dial position, select and customize the actual plants irrigated by each zone. There is one screen for each zone (if there is more than one plant type within a zone, select the type most sensitive to watering).
Set all information for one zone (or station), then advance to the next station with the Station button on the ET Module. Use the right arrow key to advance through the fields, and the +/- buttons to scroll through all possible selections.
There are only two maturity settings for all plant types, NEW or
• Grass: 42 days (6 weeks)
Selects the general plant type, from a table of choices.
Selects the exact, or similar, species under Types.
If an exact plant is not represented, there are two options:
1) Choose the closest type, based on the plant’s watering needs. This is generally adequate.
NOTE: The included plant types are based on recognized categories of plants, by watering needs. The plant type choices in the ET System are representative of the different levels of watering requirements of typical plants, and are based on the Water Use Classifications of Landscape Species (WUCOLS) Guide developed by the University of California (available on the internet from the California Department of Water Resources).
At the Site Info dial position, select and customize the slope, soil, and sun exposure for each zone of irrigation. There is one screen for each zone (if there is more than one condition within a zone, select the type which predominates).
Use the arrow keys to advance to each value, and the +/- keys to cycle through the choices.
This value (along with SOIL) is used to determine automatic cycles and soaks for each station, based on the probable run-off of irrigation. Use the +/- keys to set the percentage of slope, from 0 to 50% in 1% increments. If the ground is flat, leave this setting at 0%.
Determining the slope percentage: The slope is defined as the amount of elevation change, or Rise, divided by Run (the measured distance), multiplied by 100. If an irrigated area rises 2 (feet or meters) over 15 (feet or meters), the slope is approximately 13%: (2/15)x100=13.333.
Soil type (or texture) is used together with the SLOPE information to determine the Intake Rate of the soil, resulting in cycle and soak scheduling. Use the +/- key to select from the following soil types:
Soil type is also used to determine the water holding capacity of the soil, and is important to the soil moisture calculations.
Sets the average amount of sunlight for each irrigated area, according to the following values:
At the Sprinkler Type dial position, select the type of sprinkler which irrigates each station or zone. This setting determines the Precipitation Rate for each zone, which is a critical setting in determining the Run Time for each station. Use the arrow button to navigate to the Sprinkler Type under the station number, and use the +/- keys to choose one of the sprinkler types available (or create a Custom type).
To simplify setup, several standard types of irrigation devices are included, along with typical precipitation rates. Select the type closest to the irrigation for the zone.
• Rotor – 0.5 in/hr (12.7mm/hr)
The Precipitation Rate is specified in inches or millimeters per hour. The Precipitation setting is based on the Sprinkler Type and cannot be changed directly, except when “CUSTOM” has been chosen. The longer a station runs, the more inches or millimeters it adds to the root zone of the plants. ET determines how many inches or millimeters were lost; Precipitation Rate determines how long the station needs to run, to replace the lost water. Sprinkler types should not be mixed within a single zone.
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