Working with WFS
Hunter flow-capable controllers are designed to measure and
record actual flow, shut off irrigation when a high flow condition
occurs, and identify which stations caused the condition.
The controller’s learn mode samples each station individually, and
learns a typical flow for each station in the system. During actual
irrigation, the flow can be observed at the controller. Actual flows
are recorded and stored in the controller facepack. The ACC or
I-Core controller will also compare actual flows to the estimated
total of all active stations to see if there is an unacceptable
difference, indicating a leak or break.
Consult the controller documentation closely for setup and
operation of flow monitoring. It is vital to set the correct pipe size,
so that the controller interprets the flow data correctly. It is also
important to set adequate overage amounts (minimum is 15% over
normal) and delays (default is one minute) to prevent false alarms.
Mainline Pressure Fluctuation
Some water sources may have varying pressure depending upon
the demand for water upstream of the point of connection. During
times of heavy demand, system pressure through the mainline may
This is why the flow limit percentage and delay periods (set in
the controller) are important, as false alarms lead to a lack of
confidence in the system.
Additionally, excess air in irrigation piping causes the WFS impeller
to spin freely during station startup, which may cause temporarily
high readings. This problem may be reduced by installing check
valves in the system, and by setting the alarm delay values to
prevent premature alarms.