How to apply logical rules to a sluice or gated weir

Steps

1. Open the vertical sluice, radial sluice, or gated weir unit to which you are applying the rule(s) and navigate to the Control Data tab.

2. Use the drop-down to change the Control Method to LOGICAL. Add values in the fields provided for the Minimum Setting, Maximum Setting and Max Movement Rate of the gate. In the table provided, set the Mode to AUTO to use automatic mode from the start (time 0). When in automatic mode the unit will be driven by the rules you define.

3. Navigate to the Rules sub-tab to add your logical rules. Click New Rule and the Rule editor will open in a new window. The rule must be of the form:

   IF (xxx)

   THEN MOVE = () or THEN POSITION = ()

   END

   Where xxx is a logical statement that can be evaluated as true or false. An example is provided below.

4. Repeat step 3 as required. Following 1 or more of the IF rules, an ELSE condition can be optionally provided to cover all other eventualities:

   ELSE MOVE = () or ELSE POSITION = ()

   END

   An ELSE rule must be located as the final rule in the list. 

   Example usage: controlling the gate opening of a sluice according to the water level at the gauge point A2.

   • Rule1 opens gate by 0.1 (metres) when the water level at A2 is between 12.2m and 13.0m
   • Rule2 sets the gate position to 1.0 (metres) when the water level at A2 is 13.0m or higher
   • Rule3 sets the gate position to 0.0 (metres) in other situations (i.e. when the water level at A2 is 12.2m or lower)

   RULE1

   IF(LEVEL(A2).GT.12.2.AND.LEVEL(A2).LT.13.0)

   THEN MOVE=0.1

   END

   RULE2

   IF(LEVEL(A2).GE.13.0)

   THEN POSITION=1.0

   END

   RULE3

   ELSE POSITION=0.0

   END

   Note:

   RULE3 above could also be achieved with the condition IF(LEVEL(A2).LE.12.2)

5. Click OK to save and close the unit. Don't forget to also Save these changes to the network.